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X-WR-CALDESC:Events for Instituto de Física Teórica
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TZID:Europe/Madrid
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DTSTART:20240331T010000
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DTSTART:20241027T010000
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DTSTART:20251026T010000
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DTSTART:20260329T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20250916T120000
DTEND;TZID=Europe/Madrid:20250916T133000
DTSTAMP:20260405T215030
CREATED:20250915T094023Z
LAST-MODIFIED:20251218T084759Z
UID:22587-1758024000-1758029400@www.ift.uam-csic.es
SUMMARY:Dynamical Cobordism in String Theory and Holography
DESCRIPTION:Speaker:  Jesús Huertas Castellanos\n\n\nInstitution: IFT UAM/CSIC\n\n\nLocation&Place: Red Room\n\n\nAbstract:\n\n\nThis thesis investigates the intricate relationship between topology\, gravity\, and quantum field theory within String Theory\, centering on the Cobordism Conjecture\, which asserts that any consistent quantum gravity theory must allow spacetime boundaries. It begins by introducing Dynamical Cobordism through models that realize end-of-the-world branes dynamically\, linking them to Swampland constraints. It then explores Bubbles of Nothing as non-perturbative instabilities\, classifying them and analyzing their behavior across various theories. The third section applies Dynamical Cobordism to AdS/CFT\, reinterpreting known duals in type IIB string theory as boundary-terminating geometries. Finally\, it examines topological couplings and anomalies in holographic setups\, introducing the SymTFT framework and uncovering new anomaly inflow mechanisms and Chern-Simons structures. \nSupervisor: Ángel Uranga
URL:https://www.ift.uam-csic.es/event/dynamical-cobordism-in-string-theory-and-holography/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:PhD Dissertation,Scientific activities,Training
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20250917T100000
DTEND;TZID=Europe/Madrid:20250917T113000
DTSTAMP:20260405T215030
CREATED:20250915T100302Z
LAST-MODIFIED:20251218T084759Z
UID:22589-1758103200-1758108600@www.ift.uam-csic.es
SUMMARY:Aspects of inflation beyond the single-field\, slow-roll regime
DESCRIPTION:Speaker: Alejandro Pérez Rodríguez\n\n\nLocation&Place: Red Room\n\n\nAbstract:\n\n\nIn this thesis\, we explore two departures from the single field\, slow-roll paradigm of inflation. The first part is dedicated to warm inflation. We revisit the theory of linear perturbations in this framework\, develop computational techniques for the calculation of the primordial power spectrum and apply them to the analysis of CMB constraints and the production of primordial black holes. The second part focuses on the primordial non-Gaussianity arising from a phase of ultra slow-roll during single field inflation. We study the scope and limitations of the classical delta N formalism as a probe of such non-Gaussianity and determine the extent of its correspondence with the stochastic delta N formalism. \nSupervisor: Guillermo Ballesteros Martínez
URL:https://www.ift.uam-csic.es/event/aspects-of-inflation-beyond-the-single-field-slow-roll-regime/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:PhD Dissertation,Scientific activities,Training
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20250918T120000
DTEND;TZID=Europe/Madrid:20250918T130000
DTSTAMP:20260405T215030
CREATED:20250915T100643Z
LAST-MODIFIED:20251125T081259Z
UID:22596-1758196800-1758200400@www.ift.uam-csic.es
SUMMARY:Dualities and scale-separated AdS3 vacua
DESCRIPTION:Speaker: George Tringas\n\n\nInstitution: Lehigh U.\n\n\nLocation&Place: Red Room\n\n\nAbstract:\n\n\nAfter the usual paper discussion\, our guest George Tringas (Lehigh U.) will give a talk on Dualities and scale-separated AdS3 vacua
URL:https://www.ift.uam-csic.es/event/dualities-and-scale-separated-ads3-vacua/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20250918T150000
DTEND;TZID=Europe/Madrid:20250918T160000
DTSTAMP:20260405T215030
CREATED:20250915T101421Z
LAST-MODIFIED:20251218T085608Z
UID:22598-1758207600-1758211200@www.ift.uam-csic.es
SUMMARY:Measuring Stochastic Gravitational Wave Backgrounds with Pulsar Timing Arrays
DESCRIPTION:Speaker: Mauro Pieroni\n\n\nInstitution: IEM-CSIC\n\n\nLocation&Place: Red Room\n\n\nAbstract:\n\n\nMy talk focuses on using Pulsar Timing Array (PTA) data to measure Gravitational Waves (GWs). In particular\, I will focus on Stochastic GW Background (SGWB) measurements. After a general introduction to the topic\, I will discuss a new (simplified) approach to constrain SGWBs with PTA data. This methodology significantly reduces the computational cost of the analysis\, opening up new avenues to explore the constraining power of PTA experiments. Within this framework\, I’ll revisit the constraints current and future PTA experiments can set on cosmological scenarios.
URL:https://www.ift.uam-csic.es/event/measuring-stochastic-gravitational-wave-backgrounds-with-pulsar-timing-arrays/
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:20250922T150000
DTEND;TZID=Europe/Madrid:20250922T161500
DTSTAMP:20260405T215030
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
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20250924T103000
DTEND;TZID=Europe/Madrid:20250924T120000
DTSTAMP:20260405T215030
CREATED:20250922T030615Z
LAST-MODIFIED:20251218T084759Z
UID:22798-1758709800-1758715200@www.ift.uam-csic.es
SUMMARY:PhD dissertation: Advancing Gravitational Wave Data Analysis and  Exploring New Sources
DESCRIPTION:Gonzalo Morrás PhD dissertation.\n\nSupervisor: Juan García-Bellido\n\nVenue&Time: Blue Room / 10:30 AM\n\n\nAbstract: Gravitational wave (GW) astronomy has opened a new window onto the Universe\, allowing us to study compact objects and fundamental physics. This thesis develops new methods and models to improve the detection and interpretation of GW signals\, with a focus on exotic and underexplored sources. It includes pioneering searches for close hyperbolic encounters\, studies of low-mass and sub-solar-mass binaries\, analyses of local cosmic effects on merger rates\, and the development of advanced waveform models and data analysis algorithms. These contributions enhance our ability to uncover new astrophysical phenomena and will support future GW observations with current and next-generation detectors.
URL:https://www.ift.uam-csic.es/event/advancing-gravitational-wave-data-analysis-and-exploring-new-sources/
LOCATION:Blue Room\, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:PhD Dissertation,Scientific activities,Training
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20250924T113000
DTEND;TZID=Europe/Madrid:20250924T123000
DTSTAMP:20260405T215030
CREATED:20250922T031149Z
LAST-MODIFIED:20251125T081259Z
UID:22804-1758713400-1758717000@www.ift.uam-csic.es
SUMMARY:QIJC: Higher Abelian Quantum Double Models: Introduction to the Characterization and Classification of the Ground State Subspace
DESCRIPTION:Quantum Information Journal Club \nSpeaker: Javier Ignacio Lorca Espiro (Universidad de la Frontera\, Chile) \nVenue&Time: Grey Room 3 / 11:30 AM \nAbstract: Higher dimensional abelian quantum double models have been shown to be well defined in any finite dimension and exhibit the characteristic behavior of SPT phases models. In this talk\, we will introduce the problem and discuss the characterization of the topological ground state subspace and ts classification scheme. We will discuss the connection of these models with pressing problems in condensed matter physics and quantum computation.
URL:https://www.ift.uam-csic.es/event/qijc-higher-abelian-quantum-double-models-introduction-to-the-characterization-and-classification-of-the-ground-state-subspace/
LOCATION:Gray Room 3\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20250924T150000
DTEND;TZID=Europe/Madrid:20250924T160000
DTSTAMP:20260405T215030
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:20250925T120000
DTEND;TZID=Europe/Madrid:20250925T130000
DTSTAMP:20260405T215030
CREATED:20250922T031655Z
LAST-MODIFIED:20251125T081259Z
UID:22807-1758801600-1758805200@www.ift.uam-csic.es
SUMMARY:SPS JC: de Sitter and Machine Learning
DESCRIPTION:SPS Journal Club\n\nSpeaker: Bruno De Luca\n\nVenue&Time: Red Room / 12:00\n\nAbstract: \nThe problem of constructing de Sitter vacua in quantum theories of gravity is constrained by no-go theorems and made computationally challenging by the absence of supersymmetry. A popular approach to make it more tractableis to start from a supersymmetric compactification\, such as on a Calabi-Yau manifold. This simplification comes at the price of greatly restricting the allowed physical sources and possible geometries.\n\nIn this introduction\, I will discuss some of my works on how to break supersymmetry at the compactification scale by directly solving the equations of motion. This allows for more general internal geometries and thus more general physical configurations\, including four-dimensional de Sitter vacua supported by Casimir energy on negatively-curved manifolds\, and scale-separated AdS4 vacua.\n\nHowever\, describing the corresponding geometries in detail can sometimes require to solve Einstein-like PDEs on non-trivial manifolds. This problem is intractable even numerically\, with standard methods. Luckily\, Machine Learning is emerging as a method to overcome these difficulties\, and we will discuss a recent proposal for using Machine Learning techniques to explicitly construct negatively-curved geometries.\n\nTime permitting\, we will also describe the other way around: how we can use insights from physics to design algorithms with broad applicability to Machine Learning and beyond\, focusing on optimization and sampling algorithms obtained from energy-preserving chaotic Hamiltonians with non-standard kinetic terms.\n\n\n\nSome references:\n2501.00093\n2104.13380\n2212.02511\n2201.11137
URL:https://www.ift.uam-csic.es/event/sps-jc-de-sitter-and-machine-learning/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20250925T150000
DTEND;TZID=Europe/Madrid:20250925T160000
DTSTAMP:20260405T215030
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:20250926T113000
DTEND;TZID=Europe/Madrid:20250926T113000
DTSTAMP:20260405T215030
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:20250926T150000
DTEND;TZID=Europe/Madrid:20250926T160000
DTSTAMP:20260405T215030
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:20250929T090000
DTEND;TZID=Europe/Madrid:20251002T183000
DTSTAMP:20260405T215030
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:20250929T150000
DTEND;TZID=Europe/Madrid:20250929T160000
DTSTAMP:20260405T215030
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:20250929T150000
DTEND;TZID=Europe/Madrid:20250929T160000
DTSTAMP:20260405T215030
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:20251002T120000
DTEND;TZID=Europe/Madrid:20251002T130000
DTSTAMP:20260405T215030
CREATED:20250928T204751Z
LAST-MODIFIED:20251125T081259Z
UID:23072-1759406400-1759410000@www.ift.uam-csic.es
SUMMARY:SPS Journal Club: 'Landau-Ginzburg Models and Flux Vacua'
DESCRIPTION:Speaker: Muthusamy Rajaguru (IFT Madrid)\n\n\n\n\nVenue&Time: Red Room / 12:00 PM\n\n\n\nAbstract: In this talk\, I will give an overview of recent progress that has been made in constructing non-geometric flux vacua. In particular\, I will focus on type IIB string compactifications where the internal geometry is described by the 2^6 and 1^9 Landau-Ginzburg (LG) models. These LG models have no Kähler moduli and allow us to realize GKP-type vacua explicitly in the interior of the complex structure moduli space.  I will summarize the properties of these vacua and their implications for certain Swampland conjectures.\n\nRelevant literature – 2503.16599\, 2407.16756\, 2407.16758\, 2406.03435\, 2306.15714\, 2203.15818
URL:https://www.ift.uam-csic.es/event/sps-journal-club-landau-ginzburg-models-and-flux-vacua/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251002T150000
DTEND;TZID=Europe/Madrid:20251002T160000
DTSTAMP:20260405T215030
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:20251003T100000
DTEND;TZID=Europe/Madrid:20251003T173000
DTSTAMP:20260405T215030
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:20251007T140000
DTEND;TZID=Europe/Madrid:20251007T150000
DTSTAMP:20260405T215030
CREATED:20251008T110638Z
LAST-MODIFIED:20251125T081259Z
UID:23275-1759845600-1759849200@www.ift.uam-csic.es
SUMMARY:Cosmology Journal Club
DESCRIPTION:Every Tuesday at 2:00 PM in the discussion room on the 5th floor. \nJoin the IFT cosmology/gravity journal club at benty-fields.com to vote for papers and volunteer to present them.
URL:https://www.ift.uam-csic.es/event/cosmology-journal-club/
LOCATION:Discussion room 5th floor\, C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, Madrid\, 28049\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251009T120000
DTEND;TZID=Europe/Madrid:20251009T130000
DTSTAMP:20260405T215030
CREATED:20251003T130507Z
LAST-MODIFIED:20251125T081258Z
UID:23246-1760011200-1760014800@www.ift.uam-csic.es
SUMMARY:SPS Journal Club: Symmetric Moduli Spaces\, the Swampland Distance Conjecture (...and the Emergent String Conjecture?)
DESCRIPTION:Speaker: Bernardo Fraiman (IFT)\n\n\nVenue&Time: Red Room / 12:00\n\n\nAbstract: For non-compact\, locally symmetric moduli spaces M\, the set of geodesics and the geometry of the boundary can be completely characterised using group theory. Under the assumption that M is “compactifiable” and some mild conditions on the spectrum of states\, we prove the SDC for all locally symmetric spaces. We show that the states necessarily transform in some representation of the local isometry group\, and that the convex hull encoding the exponential rate at which the leading tower of states becomes light coincides with the convex hull of the weights of the representation.\n\nIn this talk I will discuss briefly some aspects of the proof\, the domain of applicability of our assumptions and their limitations. If time permits\, I will also explain how the relation between towers and weights allows one to classify moduli spaces\, particle state representations and space time dimensions compatible with the Emergent String Conjecture. Based on 2508.18401 and work in progress.
URL:https://www.ift.uam-csic.es/event/sps-journal-club-symmetric-moduli-spaces-the-swampland-distance-conjecture-and-the-emergent-string-conjecture/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251009T150000
DTEND;TZID=Europe/Madrid:20251009T160000
DTSTAMP:20260405T215030
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:20251014T113000
DTEND;TZID=Europe/Madrid:20251014T130000
DTSTAMP:20260405T215030
CREATED:20251008T090655Z
LAST-MODIFIED:20251125T081258Z
UID:23262-1760441400-1760446800@www.ift.uam-csic.es
SUMMARY:Holo Club: Explicit Connections Between Krylov and Nielsen Complexity
DESCRIPTION:Speaker: Le-Chen Qu (IFT) \n\nVenue&Time: Grey Room 3 / 11:30 \n\nAbstract: We establish a precise correspondence between Krylov complexity and Nielsen complexity in quantum many-body systems. By identifying the Krylov basis with the generators of elementary gates in Nielsen’s geometric framework\, the Krylov complexity of precursor operators acquires a geometric interpretation as the length of straight-line paths in Nielsen geometry. This construction provides an upper bound on Nielsen complexity\, which becomes exact in the small-precursor limit. Employing the SYK model as a test case\, we demonstrate that the straight-line trajectory satisfies the Nielsen geodesic equation and remains both locally and globally minimizing up to a critical value of $z$\, beyond which conjugate points and geodesic loops arise. Within this framework\, cost functions quadratic in the Krylov index are further shown to reproduce the conjectured proportionality between the complexity growth rate and the operator size.
URL:https://www.ift.uam-csic.es/event/holo-club-explicit-connections-between-krylov-and-nielsen-complexity/
LOCATION:Gray Room 3\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251014T140000
DTEND;TZID=Europe/Madrid:20251014T150000
DTSTAMP:20260405T215030
CREATED:20251008T110737Z
LAST-MODIFIED:20251125T081258Z
UID:23278-1760450400-1760454000@www.ift.uam-csic.es
SUMMARY:Cosmology Journal Club
DESCRIPTION:Every Tuesday at 2:00 PM in the discussion room on the 5th floor. \nJoin the IFT cosmology/gravity journal club at benty-fields.com to vote for papers and volunteer to present them.
URL:https://www.ift.uam-csic.es/event/cosmology-journal-club-2/
LOCATION:Discussion room 5th floor\, C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, Madrid\, 28049\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251016T110000
DTEND;TZID=Europe/Madrid:20251016T120000
DTSTAMP:20260405T215030
CREATED:20251013T085555Z
LAST-MODIFIED:20251125T081258Z
UID:23315-1760612400-1760616000@www.ift.uam-csic.es
SUMMARY:Machine Learning and AI Journal Club
DESCRIPTION:Venue&Time: Grey Room 1
URL:https://www.ift.uam-csic.es/event/machine-learning-and-ai-journal-club/
LOCATION:Gray Room 1\, Instituto de Física Teórica\, C/ Nicolás Cabrera 13-15\, Cantoblanco\, Madrid\, Madrid\, 28049\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251016T120000
DTEND;TZID=Europe/Madrid:20251016T130000
DTSTAMP:20260405T215030
CREATED:20251009T103032Z
LAST-MODIFIED:20251125T081258Z
UID:23288-1760616000-1760619600@www.ift.uam-csic.es
SUMMARY:SPS Journal Club: 'Probing the Rigidity of String Theory'
DESCRIPTION:Speaker: Georgina Staudt (Max Planck Institute Munich) \n\nVenue&Time: Red Room / 12:00 \n\nAbstract: We investigate the deformability of the Veneziano amplitude. If string theory is the unique theory of quantum gravity\, the tree level amplitudes of weak coupling limits should be non-deformable. We make progress in this direction for tachyon-free superstring theories by deriving a general positivity bound and excluding some specific families of deformations.
URL:https://www.ift.uam-csic.es/event/sps-journal-club-probing-the-rigidity-of-string-theory/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251016T153000
DTEND;TZID=Europe/Madrid:20251016T170000
DTSTAMP:20260405T215030
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:20251016T170000
DTEND;TZID=Europe/Madrid:20251016T180000
DTSTAMP:20260405T215030
CREATED:20251010T103553Z
LAST-MODIFIED:20251125T081257Z
UID:23294-1760634000-1760637600@www.ift.uam-csic.es
SUMMARY:Old Journal Club: 'Renormalization and Effective Lagrangians'
DESCRIPTION:Pau Garcia Romeu (IFT) will present Renormalization and Effective Lagrangians by Joseph Polchinski.\n\nVenue&Time: Blue Room / 17:00\n\nAbstract:\n\nThere is a strong intuitive understanding of renormalization\, due to Wilson\, in terms of the scaling of effective lagrangians. We show that this can be made the basis for a proof of perturbative renormalization. We first study renormalizability in the language of renormalization group flows for a toy renormalization group equation. We then derive an exact renormalization group equation for a four-dimensional λø 4 theory with a momentum cutoff. We organize the cutoff dependence of the effective lagrangian into relevant and irrelevant parts\, and derive a linear equation for the irrelevant part. A lengthy but straightforward argument establishes that the piece identified as irrelevant actually is so in perturbation theory. This implies renormalizability. The method extends immediately to any system in which a momentum-space cutoff can be used\, but the principle is more general and should apply for any physical cutoff. Neither Weinberg’s theorem nor arguments based on the topology of graphs are needed.\n\nMore info: https://inspirehep.net/literature/189574
URL:https://www.ift.uam-csic.es/event/old-journal-club-renormalization-and-effective-lagrangians/
LOCATION:Blue Room\, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Journal clubs,Scientific activities
ATTACH;FMTTYPE=image/png:https://www.ift.uam-csic.es/wp-content/uploads/2025/10/OJC_Pau.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251021T140000
DTEND;TZID=Europe/Madrid:20251021T150000
DTSTAMP:20260405T215030
CREATED:20251020T062859Z
LAST-MODIFIED:20251125T081104Z
UID:23385-1761055200-1761058800@www.ift.uam-csic.es
SUMMARY:Cosmology Journal Club
DESCRIPTION:Every Tuesday at 2:00 PM in the discussion room on the 5th floor. \nJoin the IFT cosmology/gravity journal club at benty-fields.com to vote for papers and volunteer to present them.
URL:https://www.ift.uam-csic.es/event/cosmology-journal-club-3/
LOCATION:Discussion room 5th floor\, C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, Madrid\, 28049\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251021T150000
DTEND;TZID=Europe/Madrid:20251021T160000
DTSTAMP:20260405T215030
CREATED:20251020T062512Z
LAST-MODIFIED:20251125T081104Z
UID:23383-1761058800-1761062400@www.ift.uam-csic.es
SUMMARY:Pheno Journal Club: Coherently enhanced decoherence and cloud substructure of atom interferometers
DESCRIPTION:Speaker: Pablo Blanco Mas (IFT)\n\n\n\n\n\n\n\n\nVenue & Time: Grey Room 3 / 15:00\n\nAbstract: We study how coherent scattering of a background gas off an atom (or other matter) interferometer can lead to enhanced signals from phase shifts and contrast loss. We focus on the inclusion of realistic features of atom interferometers such as finite temperature\, cloud substructure\, and time-dependent cloud radii. The inclusion of these effects\, extending beyond the previously considered point-like cloud approximation\, naturally allow us to study the smooth transition between the coherent and incoherent scattering regimes. We discuss how the formalism presented herein can be tested in the laboratory (with near-infrared photons or an eV-scale electron gun)\, and discuss an application for the detection of dark matter interacting via long-range forces.
URL:https://www.ift.uam-csic.es/event/pheno-journal-club-coherently-enhanced-decoherence-and-cloud-substructure-of-atom-interferometers/
LOCATION:Gray Room 3\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20251023T120000
DTEND;TZID=Europe/Madrid:20251023T130000
DTSTAMP:20260405T215030
CREATED:20251020T062308Z
LAST-MODIFIED:20251125T081103Z
UID:23380-1761220800-1761224400@www.ift.uam-csic.es
SUMMARY:SPS Journal Club: Inflationary Particle Production and the Swampland
DESCRIPTION:Speaker: Joaquin Masias (Munich\, Max Planck Institute) \nVenue&Time: Red Room / 12:00 PM \nAbstract: TBA
URL:https://www.ift.uam-csic.es/event/sps-journal-club-inflationary-particle-production-and-the-swampland/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
END:VCALENDAR