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BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260129T113000
DTEND;TZID=Europe/Madrid:20260129T163000
DTSTAMP:20260719T070931
CREATED:20260121T105004Z
LAST-MODIFIED:20260128T182326Z
UID:24245-1769686200-1769704200@www.ift.uam-csic.es
SUMMARY:Polygonal Gravity Seminars
DESCRIPTION:Madrid’s Polygonal Gravity Seminar Series\nWednesday\, January 29th. Blue Room (IFT)\n\n11:30h First talk\n\nSpeaker: Robie Hennigar (U. Durham\, UK)\nTitle: Building Regular Black Holes\n\nAbstract: The study of regular (singularity-free) black holes has a long\nhistory\, but progress has been limited by the absence of a dynamical\nframework in which they form and by conceptual issues at the kinematical\nlevel. In this talk I will discuss recent work in which spherically\nsymmetric regular black holes emerge as unique solutions of gravity\ntheories with infinite towers of higher-curvature corrections\, enabling\nexplicit analyses of their formation and dynamics. I will review the\nconstruction\, summarize key results\, and highlight open problems.\n\n————————-\n\n12:45-14:15 Lunch break\n\n————————-\n\n14:30h Second talk\n\nSpeaker: Pablo Cano (U. Murcia)\n\nTitle: Amplification of new physics in the quasinormal mode spectrum of\nhighly-rotating black holes\n\nAbstract: The computation of quasinormal modes of rotating black holes in\nmodified theories of gravity has been recently made possible thanks to the\ndevelopment of new techniques\, like a modified Teukolsky equation and\nspectral methods. However\, no method so far has been able to peek into the\nhighly rotating regime — close to extremality. In this talk\, I will\nconsider a newly identified higher-curvature modification of GR that\npreserves the isospectrality of quasinormal modes in the eikonal limit. In\nthis theory\, eikonal perturbations can be described in terms of an\neffective scalar equation\, and solving it we will obtain the corrections\nto the eikonal Kerr quasinormal modes for arbitrary rotation. For moderate\nrotation\, we check that the eikonal computation gives a good approximation\nto the exact QNMs obtained from the modified Teukolsky equation\, even for\nlow harmonics. For high rotation\, we discover that the corrections to GR\nbecome much larger and can lead to dramatic effects. Our results suggest\nthat the observation of the ringdown of a highly rotating black hole would\nbe a “golden event” to search for new physics.\n\n———————————————–\n\nMore information about these and following monthly seminars can be found at the webpage
URL:https://www.ift.uam-csic.es/event/polygonal-gravity-seminars/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260122T150000
DTEND;TZID=Europe/Madrid:20260122T160000
DTSTAMP:20260719T070931
CREATED:20251107T112645Z
LAST-MODIFIED:20260116T124034Z
UID:23691-1769094000-1769097600@www.ift.uam-csic.es
SUMMARY:Seminar: 'Reviving PBHs: primordial black holes from supercooled phase transitions revisited'
DESCRIPTION:Speaker: Piotr Toczek (Warsaw University) \nVenue & Time: 15:00 / Red Room \nAbstract: Primordial black holes\, hypothetical objects that may have formed in the early Universe through the interplay between high-energy physics and gravity\, are very appealing candidates for dark matter. In this seminar\, I will discuss their formation as a result of the collapse of energy density fluctuations originating from supercooled first-order phase transitions. I will present the formalism that we use to track the evolution of such fluctuations in a fully covariant manner\, explicitly incorporating the spacetime metric perturbations. I will show which aspects of the phase transition drive the growth of density fluctuations and their gravitational collapse\, and identify the transitions for which the produced population of primordial black holes may constitute a significant fraction of the total dark matter abundance.
URL:https://www.ift.uam-csic.es/event/seminar-by-piotr-toczek-warsaw-university/
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260115T150000
DTEND;TZID=Europe/Madrid:20260115T160000
DTSTAMP:20260719T070931
CREATED:20251105T135455Z
LAST-MODIFIED:20260112T102251Z
UID:23689-1768489200-1768492800@www.ift.uam-csic.es
SUMMARY:Seminar: 'Dark Sector Karaoke: A 3D EFT for a Pitch-Perfect Phase Transition'
DESCRIPTION:Speaker: Cristina Puchades Ibáñez (University of Mainz) \nVenue & Time: Red Room / 15:00 \nAbstract: We explore the dynamics of cosmological phase transitions in a dark sector model featuring a dark photon associated with a U(1)D gauge symmetry and radiative symmetry breaking. Our analysis focuses on different approaches to construct the effective potential: the high-temperature approximation\, a full numerical evaluation of the thermal integrals\, and a dimensionally reduced 3D effective theory built with DRalgo\, at both leading and next-to-leading order. We as well explore the effect of including the running of the parameters in order to respect the hiercarchy scales. We investigate how these methods impact the characterization of the phase transition\, particularly in the supercooled regime. Our results show the importance of method choice when predicting observable signatures\, and establish a benchmark for future studies of first-order phase transitions in models with weakly coupled dark sectors.
URL:https://www.ift.uam-csic.es/event/seminar-by-cristina-puchades-ibanez-university-of-mainz/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260114T150000
DTEND;TZID=Europe/Madrid:20260114T170000
DTSTAMP:20260719T070931
CREATED:20260108T231658Z
LAST-MODIFIED:20260108T234236Z
UID:24163-1768402800-1768410000@www.ift.uam-csic.es
SUMMARY:GRASS Seminar: 'Axions\, Three-Forms\, and M-Theory'
DESCRIPTION:Gravity\, Supergravity and Superstrings (GRASS) Seminar \nSpeaker: Ziqi Yan (Niels Bohr Institute\, Denmark) \nVenue & Time: Red Room / 15:00 \nAbstract: Scalar fields with masses protected by global shift symmetries\, commonly referred to as axions\, are abundantly used in effective field theories in cosmology and particle physics. I will discuss a (4+1) dimensional braneworld construction for axion-like particles\, where a 3-brane is coupled to a flux in the fifth dimension orthogonal to the brane\, and its uplift to M-theory. From the (3+1)-dimensional perspective\, this construction generates a mass for the axion and matches previously known proposals based on the coupling between the axion and a three-form gauge field.
URL:https://www.ift.uam-csic.es/event/grass-seminar-by-ziqi-yan-niels-bohr-institute-denmark/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251215T150000
DTEND;TZID=Europe/Madrid:20251215T160000
DTSTAMP:20260719T070931
CREATED:20251128T152441Z
LAST-MODIFIED:20251218T085637Z
UID:23961-1765810800-1765814400@www.ift.uam-csic.es
SUMMARY:Seminar: 'Active Galactic Nuclei as Laboratories for Fundamental Physics'
DESCRIPTION:Speaker: Gonzalo Herrera (MIT & Harvard) \nVenue & Time: Red Room / 15:00\n\nAbstract: The vicinity of supermassive black holes at the center of Galaxies represents one of the most extreme environments in the Universe. In Active Galactic Nuclei (AGN)\, intense gravitational fields\, relativistic particle acceleration\, strong magnetic fields\, and dense ambient gas and radiation coexist in conditions unmatched by other astrophysical sources or Earth-based laboratories. Recent high-energy neutrino observations from the IceCube collaboration and their electromagnetic counterparts from AGN have revolutionized the field of multi-messenger astronomy\, providing the first direct window into the hadronic and leptonic processes operating at these cosmic accelerators\, and opening new opportunities to test fundamental physics at energies and densities beyond terrestrial reach. \nHere I will discuss how these environments can be exploited as laboratories for fundamental physics. I will first focus on dark matter–Standard Model interactions\, showing how dark matter scattering with cosmic rays\, neutrinos and gamma-rays can can lead to observable signatures on Earth. Second\, I will consider other exotic phenomena that may occur independently on the dark matter background in these environments\, such as photon-axion-like particle oscillations and microscopic black hole production from cosmic-ray collisions. Finally\, I will conclude by showing how AGN can boost the cosmic neutrino background to higher energies via Standard Model processes\, giving us a viable and promising pathway to detect the oldest particles in the Universe.
URL:https://www.ift.uam-csic.es/event/seminar-by-gonzalo-herrera-mit-harvard/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251204T150000
DTEND;TZID=Europe/Madrid:20251204T160000
DTSTAMP:20260719T070931
CREATED:20251029T111355Z
LAST-MODIFIED:20251201T091010Z
UID:23512-1764860400-1764864000@www.ift.uam-csic.es
SUMMARY:Seminar: 'The Tolerable Inhomogeneity of the Baryon Asymmetry'
DESCRIPTION:Speaker: Stefan Stelzl from EPFL\, Lausanne\n\n\nVenue & Time: Red Room / 15:00\n\n\n\nAbstract: \n\nIn this talk I present the implications of precision measurements of light element abundances in concordance with the Cosmic Microwave Background for scenarios of physics beyond the Standard Model that generate large inhomogeneities in the baryon-to-photon ratio. We show that precision Big Bang Nucleosynthesis (BBN) imposes strong constraints on any mechanism that produces large scale inhomogeneities at temperatures of the order or below a TeV. In particular\, we find that inhomogeneities of the order of at comoving length scales larger than the comoving horizon at the temperature of are in conflict with the measured light element abundances. I then briefly highlight the phenomenological consequences thereof.
URL:https://www.ift.uam-csic.es/event/seminar-by-stefan-stelzl-epfl-lausanne/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251202T150000
DTEND;TZID=Europe/Madrid:20251202T160000
DTSTAMP:20260719T070931
CREATED:20251114T160431Z
LAST-MODIFIED:20251218T085418Z
UID:23744-1764687600-1764691200@www.ift.uam-csic.es
SUMMARY:GRASS Seminar: 'Electric-magnetic duality of dyonic Kerr-Newman-NUT-AdS spacetimes'
DESCRIPTION:GRASS (GRAvity\, Supergravity & Superstrings) Seminar \nSpeaker: Cristóbal Andrés Corral (Universidad Adolfo Ibáñez\, Chle) \nVenue & Time: Red Room / 15:00 \nAbstract: We discuss the (anti-)self-duality conditions under which the electric and magnetic parts of the conserved charges of the dyonic Kerr-Newman-NUT-AdS solution become equivalent. Within a holographic framework\, the stress tensor and the boundary Cotton tensor are computed from the electric/magnetic content of the Weyl tensor. The holographic stress tensor/Cotton tensor duality is recovered along the (anti-)self-dual curve in parameter space. We show that the latter not only implies a duality relation for the mass but also for the angular momentum.  The partition function is computed to first order in the saddle-point approximation and a BPS bound is obtained. The ground state of the theory is enlarged to all the (anti-)self-dual configurations when the SO(4) and U(1) Pontryagin densities are introduced. We demonstrate this at the level of the action and variations thereof.
URL:https://www.ift.uam-csic.es/event/grass-seminar-electric-magnetic-duality-of-dyonic-kerr-newman-nut-ads-spacetimes/
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251201T150000
DTEND;TZID=Europe/Madrid:20251201T160000
DTSTAMP:20260719T070931
CREATED:20251027T105029Z
LAST-MODIFIED:20251218T085419Z
UID:23469-1764601200-1764604800@www.ift.uam-csic.es
SUMMARY:Seminar: Quantum simulation of lattice gauge theories with Rydberg atom arrays
DESCRIPTION:Speaker: Daniel González Cuadra (IFT) \nVenue&Time: Red Room / 15:00 \nAbstract: Lattice gauge theories (LGTs) describe a broad range of phenomena in condensed matter and particle physics. A prominent example is confinement\, responsible for bounding quarks inside hadrons such as protons or neutrons. When quark-antiquark pairs are separated\, the energy stored in the string of gluon fields connecting them grows linearly with their distance\, until there is enough energy to create new pairs from the vacuum and break the string. While such phenomena are ubiquitous in LGTs\, simulating the resulting dynamics is a challenging task. In this talk\, I will report the observation of string breaking in synthetic quantum matter using a programmable quantum simulator based on neutral atom arrays [Nature 642\, 321–326 (2025)]. I will first show how a (2+1)D LGT with dynamical matter can be efficiently implemented when the atoms are placed on a Kagome geometry\, with a local U(1) symmetry emerging from the Rydberg blockade\, while long-range Rydberg interactions naturally give rise to a linear confining potential between pairs of charges. In the experiment\, we probe string breaking in equilibrium by adiabatically preparing the ground state of the atom array in the presence of defects\, distinguishing regions within the confined phase dominated by fluctuating strings or by broken string configurations. Finally\, by harnessing local control over the atomic detuning\, we quench string states and observe string breaking dynamics exhibiting a many-body resonance phenomenon. As an outlook\, I will present a roadmap to further explore phenomena in high-energy physics using programmable quantum simulators.
URL:https://www.ift.uam-csic.es/event/seminar-quantum-simulation-of-lattice-gauge-theories-with-rydberg-atom-arrays-2/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251127T150000
DTEND;TZID=Europe/Madrid:20251127T160000
DTSTAMP:20260719T070931
CREATED:20251029T123222Z
LAST-MODIFIED:20251125T081857Z
UID:23518-1764255600-1764259200@www.ift.uam-csic.es
SUMMARY:Seminar: Constraining Muon decay parameters from CEvNS measurements at Spallation Sources
DESCRIPTION:Speaker: Suraj Prakash\, IFIC (Valencia)\n \nVenue&Time: Red Room / 3:00 PM \nAbstract: The talk will present a study of the sensitivity of COHERENT-like experiments to non-standard neutrino interactions within the vWEFT framework\, i.e. low-energy EFT with additional right-handed Dirac neutrinos. Our analysis incorporates\, for the first time\, flavor-general New Physics effects in both neutrino production (from pion and muon decays) and neutrino detection\, through Coherent Elastic Neutrino-Nucleus Scattering (CEvNS). As a special case\, we will highlight how CEvNS data provide an alternative probe for muon decay parameters\, for neutrino experiments where muon decay is a source of neutrinos. We will further illustrate how the results can be conveniently formulated in compact form and the ease with which they can be implemented in existing or future analyses using effective nuclear charges. Finally\, We will discuss numerical results based on current COHERENT data\, and also present estimates for the sensitivity of future measurements.
URL:https://www.ift.uam-csic.es/event/seminar-constraining-muon-decay-parameters-from-cevns-measurements-at-spallation-sources/
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251125T153000
DTEND;TZID=Europe/Madrid:20251125T170000
DTSTAMP:20260719T070931
CREATED:20251111T155545Z
LAST-MODIFIED:20251125T082113Z
UID:23716-1764084600-1764090000@www.ift.uam-csic.es
SUMMARY:EDI Trainings: 'Intersectionality. Reflection on identity\, privilege and positioning in academia'
DESCRIPTION:Speaker: Shannah Khan. Director of Intersect Madrid \nVenue & Time: Blue Room / 3:30 PM \nAbstract: This workshop offers a space for reflection and dialogue to explore how our personal identities\, experiences\, and social positions influence the way we participate in academic contexts. Through participatory activities\, it seeks to foster a deeper understanding of intersectionality and the role that privilege and position play in our interactions and perspectives within academia.
URL:https://www.ift.uam-csic.es/event/intersectionality-reflection-on-identity-privilege-and-positioning-in-academia/
LOCATION:Blue Room\, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251124T150000
DTEND;TZID=Europe/Madrid:20251124T160000
DTSTAMP:20260719T070931
CREATED:20251029T112558Z
LAST-MODIFIED:20251125T081536Z
UID:23516-1763996400-1764000000@www.ift.uam-csic.es
SUMMARY:Seminar: 'Gravitational Lensing of Waves: a new window into cosmology and fundamental physics'
DESCRIPTION:Speaker: Miguel Zumalacárregui from Max Planck Institute for Gravitational Physics (Albert Einstein Institute). \nVenue&Time: Red Room / 3:00 PM \nAbstract: Gravitational lensing\, the bending of light by gravity\, is essential for interpreting astronomical observations and provides key insight into astrophysics\, cosmology\, and fundamental physics. A new frontier in gravitational lensing intersects with another key prediction of Einstein’s theory: gravitational waves\, fluctuations of space-time produced by the collision of black holes and neutron stars. Like light\, gravitational waves are deflected and magnified by the intervening matter distribution\, but their unique properties (low frequency\, lack of absorption and ab-initio emission models) enable novel signatures and applications. I will present the phenomenology of lensed gravitational waves and the science they will deliver to identify high-redshift sources and probe dark-matter and new gravitational fields. As guiding example I will focus on GW231123: the first compelling lensed black hole merger candidate\, its interpretation and consequences.
URL:https://www.ift.uam-csic.es/event/seminar-by-miguel-zumalacarregui/
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251120T150000
DTEND;TZID=Europe/Madrid:20251120T160000
DTSTAMP:20260719T070931
CREATED:20251003T100315Z
LAST-MODIFIED:20260324T094549Z
UID:23229-1763650800-1763654400@www.ift.uam-csic.es
SUMMARY:Seminar: 'Classical constant electric fields and the Schwinger effect in de Sitter'
DESCRIPTION:Speaker: Roberto Vega-Morales \nVenue&Time: Red Room / 15:00 \nAbstract: In this talk I will discuss constant classical electric fields and the Schwinger effect in de Sitter space\, which has potential implications for magnetogenesis and inflationary dark matter production. I will first go through the conditions for sustaining a constant electric field in de Sitter space before reviewing the calculation of the Schwinger current\, pointing out puzzling results in previous calculations found in the literature and how we have resolved them. I will then comment on current and future directions related to this topic. This talk is based on arXiv:2508.14973. \nSeminar related to the I+D+i project whose reference is CEX2020-001007-S\, funded by MCIN/AEI/10.13039/501100011033. The topic is framed within the following research line: Origin and composition of the universe: Astroparticles and Cosmology (Astro/Cosmo).
URL:https://www.ift.uam-csic.es/event/seminar-by-roberto-vega-morales-2/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251119T113000
DTEND;TZID=Europe/Madrid:20251119T130000
DTSTAMP:20260719T070931
CREATED:20251029T141050Z
LAST-MODIFIED:20251218T085419Z
UID:23520-1763551800-1763557200@www.ift.uam-csic.es
SUMMARY:Seminar: Average-case quantum complexity from glassiness
DESCRIPTION:Speaker: Alexander Zlokapa (MIT) \nVenue & Time: Red Room / 11:30 \nAbstract: In the classical setting\, glassiness characterizes many natural problems (e.g.\, random k-SAT) and underlies average-case hardness by obstructing a family of “stable” classical algorithms (e.g.\, constant-time Langevin dynamics). In this work\, we develop analogous quantum results. Our techniques\, based on quantum optimal transport\, differ significantly from classical probabilistic approaches due to the sign problem in the absence of a known eigenbasis. We show that quantum glassiness obstructs stable quantum algorithms\, including constant-time Lindbladian dynamics (even when starting from the maximally mixed state). Using the replica trick\, we also find that random 3-local Pauli Hamiltonians are quantumly hard and give evidence that random k-local Hamiltonians are quantumly easy for sufficiently large constant k. This differs from the analogous classical (Ising\, glassy phase for all k) and fermionic (SYK\, never glassy for any k) k-local ensembles. (Talk based on arXiv:2510.08497.)
URL:https://www.ift.uam-csic.es/event/seminar-average-case-quantum-complexity-from-glassiness/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251118T150000
DTEND;TZID=Europe/Madrid:20251118T160000
DTSTAMP:20260719T070931
CREATED:20251111T123530Z
LAST-MODIFIED:20251218T085419Z
UID:23708-1763478000-1763481600@www.ift.uam-csic.es
SUMMARY:Seminar: 'Quantum Field Theory\, an Overview'
DESCRIPTION:Speaker: Anthony Zee (Kavli Institute for Theoretical Physics and the Department of Physics\, University of California\, Santa Barbara\, CA\, USA) \nVenue & Time: Red Room / 3:00 PM \nAbstract: I give an overview and appreciation of quantum field theory\, the most precisely tested theory in physics. The talk is addressed to those without any knowledge of quantum field theory. It is based on my textbook Quantum Field Theory in a Nutshell and my semi-popular book Quantum Field Theory\, as Simply as Possible (both published by Princeton University Press.)
URL:https://www.ift.uam-csic.es/event/seminar-quantum-field-theory-an-overview/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251113T150000
DTEND;TZID=Europe/Madrid:20251113T160000
DTSTAMP:20260719T070931
CREATED:20251111T094255Z
LAST-MODIFIED:20251218T085419Z
UID:23702-1763046000-1763049600@www.ift.uam-csic.es
SUMMARY:Seminar: 'BipoSH: Structured test bed for cosmic isotropy violation'
DESCRIPTION:Speaker: Tarun Souradeep (Raman Research Institute\, Bengaluru\, India) \nVenue & Time: Red Room / 3:00 PM \nAbstract: The Cosmological Principle\, a fundamental tenet of the ‘standard model of cosmology’\, predicates a statistically isotropic distribution of fluctuations in the measured cosmic microwave background (CMB) temperature and polarization sky maps. Enigmatic anomalies claimed in the WMAP and Planck CMB sky maps\, and some other recent observations\, could challenge the standard model. However\, these claims need to be cast in an objective mathematical framework and established with statistical rigor. Bayesian inference of the underlying covariance structure of random fields on the sphere in the Bipolar Spherical Harmonic (BipoSH) representation\, developed in our research program\, provides such a framework. We review some recent inferences drawn from Planck data and discuss the future prospects with proposed CMB observations.
URL:https://www.ift.uam-csic.es/event/seminar-by-tarun-souradeep-raman-research-institute-bengaluru-india/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251105T150000
DTEND;TZID=Europe/Madrid:20251105T160000
DTSTAMP:20260719T070931
CREATED:20251029T142819Z
LAST-MODIFIED:20260320T093611Z
UID:23522-1762354800-1762358400@www.ift.uam-csic.es
SUMMARY:Machine Learning for Time-Domain Astrophysics
DESCRIPTION:Speaker: Alex Gagliano (IAIFI/MIT) \nVenue&Time: Blue Room / 3:00 PM \nAbstract: The time-evolving night sky is rich with variable stars\, supernovae\, and merging neutron stars. Wide-field imaging surveys that monitor this variability produce gappy\, multi-modal observations that demand scalable\, uncertainty-aware models for physical inference. In this talk\, I’ll survey my recent work in building machine learning methods for time-domain astrophysics\, with a focus on learning representations of our data for classification\, physical inference and the discovery of astrophysical anomalies. I’ll introduce Minuet\, a compact host-galaxy image encoder trained with diffusion modeling; and a mixture-of-experts model that fuses supernova light curves and spectra while preserving modality-specific information and yielding calibrated posteriors. I’ll conclude by outlining three areas at this intersection with the greatest potential to drive discovery in the coming years: better physical models\, scalable population studies\, and ML-guided survey optimization. \nThis seminar is related to the I+D+i project whose reference is CEX2020-001007-S\, funded by MCIN/AEI/10.13039/501100011033. The topic is framed within the following research line: Origin and composition of the universe: Astroparticles and Cosmology (Astro/Cosmo).
URL:https://www.ift.uam-csic.es/event/seminar-by-alex-gagliano-iaifi-mit/
LOCATION:Blue Room\, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251104T170000
DTEND;TZID=Europe/Madrid:20251104T180000
DTSTAMP:20260719T070931
CREATED:20251103T154536Z
LAST-MODIFIED:20260116T121652Z
UID:23686-1762275600-1762279200@www.ift.uam-csic.es
SUMMARY:Towards spectral bounds in 6d N=(1\,0) supergravity
DESCRIPTION:Speaker: Seung-Joo \n  \nVenue & Time: Tuesday\, Nov. 4th / 17:00 \n  \nAbstract: In this talk we will discuss spectral bounds in 6-dimensional N=(1\,0) supergravity. Specifically\, considering F-theory vacua on generic base surfaces\, we will constrain the U(1) vector and the tensor sectors in turn\, to present explicit spectral bounds on the respective sectors. Speculations will also be made as to how the F-/string-theoretic bounds may possibly generalize to the EFT counterparts. This seminar is related to the I+D+i project whose reference is CEX2020-001007-S\, funded by MCIN/AEI/10.13039/501100011033. The topic is framed within the following research line: Strings and quantum gravity (Gravity/Strings).
URL:https://www.ift.uam-csic.es/event/towards-spectral-bounds-in-6d-n10-supergravity/
LOCATION:Blue Room\, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251028T150000
DTEND;TZID=Europe/Madrid:20251028T160000
DTSTAMP:20260719T070931
CREATED:20251001T135113Z
LAST-MODIFIED:20251218T085637Z
UID:23144-1761663600-1761667200@www.ift.uam-csic.es
SUMMARY:Seminar: 'Entanglement asymmetry and spontaneously broken symmetries'
DESCRIPTION:Speaker: Eduardo García-Valdecasas (SISSA\, Trieste) \nVenue&Time: Red Room / 15:00 \nAbstract: Entanglement asymmetry is a relative entropy that faithfully measures the breaking of a symmetry in a subregion. We explore some applications in theories with spontaneously broken higher form symmetries. We will start with discrete abelian symmetries and then discuss continuous symmetries. We will be able to recover the Mermin-Wagner-Coleman theorem and refine it for the case of subregions.
URL:https://www.ift.uam-csic.es/event/seminar-by-eduardo-garcia-valdecasas/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251016T153000
DTEND;TZID=Europe/Madrid:20251016T170000
DTSTAMP:20260719T070931
CREATED:20250817T091751Z
LAST-MODIFIED:20260120T104641Z
UID:21519-1760628600-1760634000@www.ift.uam-csic.es
SUMMARY:DIFT Colloquium: 'Gamma Ray Bursts\, Cosmic Rays and the Sociology of Science'
DESCRIPTION:Speaker: Álvaro de Rújula from IFT & CERN \n\n\n\nVenue & Time: Aula Polivalente UAM \nAbstract: \nGamma-Ray Bursts (GRBs) and Cosmic Rays (CRs) are not difficult to comprehend. Quasars and micro-quasars are seen to emit highly relativistic “Cannonballs” (CBs)\, though the underlying mechanism remains unfathomable. The observation that core-collapse supernovae also emit CBs —plus some trivial relativistic kinematics— provides a successful understanding of GRBs and CRs. The self-defined “official experts” on these fields resist the evidence\, in an explicitly inquisitorial way.\n\nThis colloquium is related to the I+D+i project whose reference is CEX2020-001007-S\, funded by MCIN/AEI/10.13039/501100011033. The topic is framed within the following research line: Origin and composition of the universe: Astroparticles and Cosmology (Astro/Cosmo).\n 
URL:https://www.ift.uam-csic.es/event/dift-colloquium/
LOCATION:AULA POLIVALENTE UAM\, Plaza Mayor Campus de Cantoblanco UAM. C. Einstein\, 7\, Fuencarral-El Pardo\, 28049 Madrid\, Madrid\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251009T150000
DTEND;TZID=Europe/Madrid:20251009T160000
DTSTAMP:20260719T070931
CREATED:20250817T090853Z
LAST-MODIFIED:20251218T085638Z
UID:21513-1760022000-1760025600@www.ift.uam-csic.es
SUMMARY:Large neutrino mass in cosmology and keV sterile neutrino dark matter from a dark sector
DESCRIPTION:Speaker: Thomas Schwetz from Karlsruhe Institute of Technology (KIT)\n\n\n\n\n\nVenue&Time: Red Room / 3:00 PM \n\nAbstract:\nRecent results from cosmology place sever upper bounds on the sum of neutrino masses\, starting to be in conflict with lower bounds from neutrino oscillations. If this neutrino tension persists\, it may indicate new physics in cosmology and/or neutrino physics. After a brief review of the present state\, I discuss a new physics scenario able to explain this tension. It is based on an extended seesaw model for neutrino mass\, including a number of massless neutrinos acting as dark radiation\, as well as a keV state as a dark matter candidate. The dark sector is brought into equilibrium with neutrinos between BBN and recombination. This scenario predicts a slight increase in the effective number of neutrino species Neff at recombination\, potentially detectable byfuture CMB missions.
URL:https://www.ift.uam-csic.es/event/seminar-thomas-schwetz/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251003T100000
DTEND;TZID=Europe/Madrid:20251003T173000
DTSTAMP:20260719T070931
CREATED:20250922T035943Z
LAST-MODIFIED:20251218T085638Z
UID:22821-1759485600-1759512600@www.ift.uam-csic.es
SUMMARY:César Gómez (1954–2025): A rich life in theory
DESCRIPTION:Venue&Time: Blue Room / 10:20 – 17:30 \nMore info: workshops.ift.uam-csic.es/CesarGathering/ \nCésar Gómez\, whose profound contributions to gauge theory\, string theory and quantum gravity were matched by his vision and generosity\, passed away on 7 April 2025. After earning his PhD in Salamanca\, he held positions at Harvard\, the IAS and CERN before joining the CSIC in Madrid\, where he became a founding member of the Instituto de Física Teórica\, his true scientific home. \nHis career spanned key areas of theoretical physics: from the quantum vacuum in QCD and two-dimensional conformal field theory to holography\, black holes and the quantum structure of spacetime. In recent years he embarked on bold new ideas about symmetry breaking and the quantum origin of the universe\, entering one of his most creative periods when his life was cut short. \nBeyond his scientific achievements\, César was a gifted teacher\, an inspiring presence at seminars and a remarkable conversationalist. He leaves behind not only a lasting scientific legacy\, but also the memory of a colleague and friend who enriched every exchange with curiosity\, insight and humanity. \nThe meeting will be an opportunity to celebrate Cesar’s life and career through the personal recollections of some of his friends and collaborators. \nRead CERN’s obituary
URL:https://www.ift.uam-csic.es/event/cesar-gomez-1954-2025-a-rich-life-in-theory/
LOCATION:Blue Room\, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251002T150000
DTEND;TZID=Europe/Madrid:20251002T160000
DTSTAMP:20260719T070931
CREATED:20250613T073446Z
LAST-MODIFIED:20251218T085638Z
UID:18492-1759417200-1759420800@www.ift.uam-csic.es
SUMMARY:Fast inference for slow likelihoods with probabilistic machine-learning
DESCRIPTION:Speaker: Jesús Torrado from IEM-CSIC\n\n\n\n\nVenue&Time: Red Room / 3:00 PM\n\n\n\nAbstract: Inference for slow likelihoods can require weeks or months\, if possible at all\, with traditional Monte Carlo samplers. This would be the case\, for example\, when fitting expensive non-linear matter spectrum models\, or when characterizing individual long-duration GW events. I will introduce a fast machine-learning Bayesian inference algorithm for general non-Gaussian posteriors with a moderate number of parameters. I will present a pedagogical discussion of some general aspects of it\, such as dealing with the curse of dimensionality\, characterizing a region of interest\, or parallelising active learning. I will show that the total number of expensive likelihood evaluations can be reduced by at least two orders of magnitude compared to traditional Monte Carlo methods\, at low overhead costs and no pre-training. I will demonstrate its performance on a couple of real cosmological and GW problems.
URL:https://www.ift.uam-csic.es/event/tba-4/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20250929T150000
DTEND;TZID=Europe/Madrid:20250929T160000
DTSTAMP:20260719T070931
CREATED:20250929T104149Z
LAST-MODIFIED:20251218T085638Z
UID:23129-1759158000-1759161600@www.ift.uam-csic.es
SUMMARY:Seminar by Roberto Vega-Morales
DESCRIPTION:Speaker: Roberto Vega-Morales from Granada U. \n\nVenue&Time: Red Room / 3:00 PM\n\nAbstract: TBA
URL:https://www.ift.uam-csic.es/event/seminar-by-roberto-vega-morales/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20250929T150000
DTEND;TZID=Europe/Madrid:20250929T160000
DTSTAMP:20260719T070931
CREATED:20250922T120108Z
LAST-MODIFIED:20251218T085639Z
UID:22876-1759158000-1759161600@www.ift.uam-csic.es
SUMMARY:Muon g-2: nuts and bolts and lattice QCD
DESCRIPTION:Speaker: Andreas Kronfeld (Fermilab) \nVenue&Time: Red Room / 3:00 PM \nAbstract: This seminar consists of two parts. First\, it is discussed how various approaches to the hadronic vacuum polarization (HVP) for the anomalous magnetic moment of the muon\, g-2\, are connected. Second\, results for the HVP from lattice QCD are presented\, focusing on the work of the Fermilab Lattice\, HPQCD\, and MILC collaborations.
URL:https://www.ift.uam-csic.es/event/muon-g-2-nuts-and-bolts-and-lattice-qcd/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20250929T090000
DTEND;TZID=Europe/Madrid:20251002T183000
DTSTAMP:20260719T070931
CREATED:20250922T115745Z
LAST-MODIFIED:20251218T085639Z
UID:22872-1759136400-1759429800@www.ift.uam-csic.es
SUMMARY:LHC Working Group on Forward Physics and Diffraction
DESCRIPTION:The September 29-October 2  2025 four-day workshop in Madrid of the LHC Physics Centre at CERN (LPCC) Forward Physics Working Group provides a forum at CERN for experimental collaborations and theorists to meet and exchange latest results across all topics of forward physics at the LHC. \nThe workshop will take place at the Institute of Theoretical Physics (Campus de Cantoblanco 28049 Madrid Spain) and we will be hosted by Prof. Agustin Sabio Vera. To come to IFT\, you can take Line C-4 (Colmenar Viejo or Alcobendas/San Sebastián de los Reyes)\, that takes you to the University (Cantoblanco-Universidad Station). You can pick it up in Atocha (main station in the Centre/South of Madrid)\, Nuevos Ministerios (Paseo de la Castellana) and Chamartín (main station in the North). After Chamartín\, the second station is Cantoblanco-Universidad\, where you should exit. \nMore info.
URL:https://www.ift.uam-csic.es/event/lhc-working-group-on-forward-physics-and-diffraction/
LOCATION:Blue Room\, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20250926T150000
DTEND;TZID=Europe/Madrid:20250926T160000
DTSTAMP:20260719T070931
CREATED:20250922T030252Z
LAST-MODIFIED:20251218T085639Z
UID:22793-1758898800-1758902400@www.ift.uam-csic.es
SUMMARY:Delta N formalism: non-linear evolution of scalar and tensor perturbations during inflation
DESCRIPTION:Speaker: Danilo Artigas\n\n\nInstitution: Kyoto University\n\n\nLocation&Place: IFT Seminar Room/Red Room\n\n\n\n\n\nAbstract:\n\n\nLinear-perturbation theory has proven to be an extremely powerful tool to compare inflationary models with observational data. Recently\, the newcoming high-precision observations call for predictions beyond linear perturbations. Such effects are known to be relevant for example in the production of primordial black holes or scalar-induced gravitational waves. The delta N formalism proposes to capture some of these non-linearities by describing the universe as a set of homogeneous patches evolving independently. After reviewing its formulation\, I will apply it to the case of a single scalar field following a slow-roll evolution\, briefly interrupted by a phase of ultra-slow roll where the potential is nearly flat. Taking care of the correlation of the patches\, I will show how to obtain correlation functions of scalar perturbations. As a final note\, I will briefly show how this procedure can also be applied to describe primordial gravitational waves.
URL:https://www.ift.uam-csic.es/event/delta-n-formalism-non-linear-evolution-of-scalar-and-tensor-perturbations-during-inflation/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20250926T113000
DTEND;TZID=Europe/Madrid:20250926T113000
DTSTAMP:20260719T070931
CREATED:20250922T115233Z
LAST-MODIFIED:20251218T085639Z
UID:22869-1758886200-1758886200@www.ift.uam-csic.es
SUMMARY:To bind or not to bind\, a tale of two nucleons
DESCRIPTION:Speaker: André Walker-Loud (LBNL) \nVenue&Time: Red Room / 11:30 AM \nAbstract: Our ability to understand the emergence of nuclear physics from the Standard Model requires an understanding two nucleon interactions from the underlying quark and gluon degrees of freedom. Due to the non-perturbative nature of QCD at low-energies\, the only method to provide such predictions\, with quantifiable uncertainties is lattice QCD. Yet the application of lattice QCD to the two-nucleon problem is beset by a number of significant challenges\, such that it has remained uncertain whether di-nucleon systems form bound states at pion masses heavier than nature. I will present recent work exploring this question with all varieties of methods in the literature\, including the HAL QCD potential method\, on a single set of gauge ensembles\, enabling for a direct comparison of the methods.
URL:https://www.ift.uam-csic.es/event/to-bind-or-not-to-bind-a-tale-of-two-nucleons/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20250925T150000
DTEND;TZID=Europe/Madrid:20250925T160000
DTSTAMP:20260719T070931
CREATED:20250613T073431Z
LAST-MODIFIED:20251218T085607Z
UID:18490-1758812400-1758816000@www.ift.uam-csic.es
SUMMARY:Stirring up the intracluster medium with substructures
DESCRIPTION:Speaker: Go Ogiya from Zhejiang University\n\n\n\nVenue&Time: Red Room / 3:00 PM\n\n\n\n\nAbstract: \nThe origin of the turbulent motion of the intracluster medium (ICM) has been a longstanding open question. Stirring by substructures (member galaxies and dark matter subhaloes) orbiting within a galaxy cluster is a possible mechanism to generate and maintain the ICM turbulence. We develop a semi-analytic model considering three processes of energy transfer from substructures to the ICM (dynamical friction\, ram pressure\, and sloshing)\, and propagation and dissipation of the deposited energy. The model reproduces the gas velocity structure derived from hydrodynamical simulations. We find that dynamical friction is responsible for explaining the strong turbulence (~ 500 km/s) in the cluster outskirts (> 1 Mpc)\, while sloshing explains the mild turbulence (~100 km/s) in the cluster centre. In the talk\, we will also discuss implications for X-ray observations of the new generation\, such as XRISM and eROSITA.
URL:https://www.ift.uam-csic.es/event/tbd/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20250924T150000
DTEND;TZID=Europe/Madrid:20250924T160000
DTSTAMP:20260719T070931
CREATED:20250922T064515Z
LAST-MODIFIED:20251218T085608Z
UID:22830-1758726000-1758729600@www.ift.uam-csic.es
SUMMARY:Kaluza-Klein Amplitudes in AdS: the Virasoro-Shapiro and the Veneziano Amplitudes
DESCRIPTION:Speaker: Bo Wang from Zhejiang U. Inst. Mod. Phys. \nVenue&Time: Red Room / 3:00 PM \nAbstract: \nI will report recent progress on AdS Virasoro-Shapiro and Veneziano amplitudes for half-BPS operators with arbitrary Kaluza-Klein modes. The key ingredient is a bootstrap built directly in the world-sheet representation\, together with a novel formalism. This approach yields a structural string description of AdS amplitude and a precise correspondence with correlators in N=4 SYM: at first curvature order we obtain a unique solution. I will also discuss the applications to broader holographic models beyond AdS5*S5.
URL:https://www.ift.uam-csic.es/event/kaluza-klein-amplitudes-in-ads-the-virasoro-shapiro-and-the-veneziano-amplitudes/
CATEGORIES:Scientific activities,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20250922T150000
DTEND;TZID=Europe/Madrid:20250922T161500
DTSTAMP:20260719T070931
CREATED:20250613T073431Z
LAST-MODIFIED:20251218T085608Z
UID:18489-1758553200-1758557700@www.ift.uam-csic.es
SUMMARY:Vacuum stability for gravity compactifications
DESCRIPTION:Speaker: Alessandro Tomasiello (Milano Bicocca)\n\n\nVenue&Time: 15:00 / Red Room\n\n\nAbstract: Compactifying from higher dimensions typically produces many different vacuum solutions; this leads to multiple possible decay channels\, mediated by the nucleation of bubbles. In string theory\, the latter can be expanding D-branes. Supersymmetry provides a stabilization mechanism; I will describe how to replicate it for supersymmetry-breaking vacua\, with some partial success.
URL:https://www.ift.uam-csic.es/event/seminar-by-alessandro-tomasiello-milano-bicocca/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
END:VCALENDAR