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X-WR-CALNAME:Instituto de Física Teórica
X-ORIGINAL-URL:https://www.ift.uam-csic.es
X-WR-CALDESC:Events for Instituto de Física Teórica
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BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260918T110000
DTEND;TZID=Europe/Madrid:20260918T133000
DTSTAMP:20260930T235214
CREATED:20260908T110406Z
LAST-MODIFIED:20260918T114325Z
UID:25536-1789729200-1789738200@www.ift.uam-csic.es
SUMMARY:PhD Defense by David Alonso-González: Into The Dark: Novel and Complementary Searches in Hidden Sectors
DESCRIPTION:Title: Into The Dark: Novel and Complementary Searches in Hidden Sectors\n\nVenue & Time: Blue Room / 11:00-13:30\n\nAbstract: This thesis explores weakly coupled extensions of the Standard Model\, focusing on hidden sectors that may evade conventional experimental searches while addressing some of the main open questions in particle physics\, such as the nature of dark matter and the origin of neutrino masses. The work is organized around three complementary case studies involving a thermal dark matter candidate connected to the Standard Model through a vector portal\, axionlike particles produced in core-collapse supernovae and their possible detection at terrestrial neutrino experiments\, and the interplay between dark matter direct detection experiments and spallation source facilities to constrain the properties of sterile neutrinos. These three works emphasize the importance of combining different experimental strategies to constrain or reconstruct new weakly coupled physics scenarios.
URL:https://www.ift.uam-csic.es/event/phd-defense-by-david-alonso-gonzalez-into-the-dark-novel-and-complementary-searches-in-hidden-sectors/
LOCATION:Blue Room\, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:PhD Dissertation,Training
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260921T110000
DTEND;TZID=Europe/Madrid:20260921T130000
DTSTAMP:20260930T235214
CREATED:20260908T111916Z
LAST-MODIFIED:20260921T093237Z
UID:25541-1789988400-1789995600@www.ift.uam-csic.es
SUMMARY:PhD Defense by Indira Ocampo Justiniano: A machine learning approach for unraveling the nature of dark matter and dark energy
DESCRIPTION:Title: A machine learning approach for unraveling the nature of dark matter and dark energy \nVenue & Time: Orange Room / 11:00-13:00 \n\nAbstract: Cosmology nowadays is benefiting from an exponential increase of data\, transforming into a precision science. This will help us understand better two of the most important open issues in theoretical physics\, namely understanding the nature of dark matter and dark energy. However\, the vast quantity and quality of the data collected from present and upcoming cosmological surveys has become so demanding\, that sophisticated computational tools are required. As a result\, machine learning methods are being implemented for data analysis and model constraints with the hope of alleviating tensions in the parameters inferred from different cosmological probes. A significant challenge remains in the complexity of these models: as architectures become more accurate\, this usually comes with the trade-off of their interpretability. This can lead to a lack of transparency and trustworthiness in a field that demands validation based on physical laws. The research presented in this thesis focuses on different architectures based on neural networks to search for signatures of physics beyond ΛCDM\, with a particular emphasis on interpretability tools that allow extracting the most informative data for the model’s predictions. \nSupervisor: Savvas Nesseris \n\nA small reception will take place afterwards on the terrace of IMDEA around 13:00. \n  \n 
URL:https://www.ift.uam-csic.es/event/phd-defense-by-indira-ocampo-justiniano-a-machine-learning-approach-for-unraveling-the-nature-of-dark-matter-and-dark-energy/
LOCATION:Orange Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\, Spain
CATEGORIES:PhD Dissertation,Training
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260921T150000
DTEND;TZID=Europe/Madrid:20260921T160000
DTSTAMP:20260930T235214
CREATED:20260821T101946Z
LAST-MODIFIED:20260921T142959Z
UID:25494-1790002800-1790006400@www.ift.uam-csic.es
SUMMARY:Seminar by Georg Weiglein (DESY): "Exploring the Higgs potential and the evolution of the early universe"
DESCRIPTION:Title: Exploring the Higgs potential and the evolution of the early universe \nSpeaker: Georg Weiglein (DESY) \nVenue&Time: Orange Room | 15:00 \nAbstract: The Higgs potential is of central importance for addressing fundamental open questions in our understanding of the dynamics of electroweak symmetry breaking\, its connection to the electroweak phase transition in the early universe and for possible explanations for the observed imbalance between matter and anti-matter in the universe. However\, up to now neither the shape of the Higgs potential that is realised in nature is known nor the underlying physics that actually gives rise to the Higgs potential. The present experimental results from the LHC related to the Higgs potential are confronted with precise theory predictions\, and future prospects for the exploration of the HIggs potential are highlighted. The theoretical uncertainties in predicting the thermal evolution of the early universe and possible gravitational wave signals arising from the electroweak phase transition are discussed.
URL:https://www.ift.uam-csic.es/event/seminar-georg-weiglein-desy/
LOCATION:Orange 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:20260923T113000
DTEND;TZID=Europe/Madrid:20260923T123000
DTSTAMP:20260930T235214
CREATED:20260917T073455Z
LAST-MODIFIED:20260917T073455Z
UID:25614-1790163000-1790166600@www.ift.uam-csic.es
SUMMARY:Quantum Information Journal Club: "Quantum information transitions and the breakdown of non-Abelian topological quantum memories"
DESCRIPTION:Speaker: Pablo Sala (ift)\n\nTitle: “Quantum information transitions and the breakdown of non-Abelian topological quantum memories”\n\nVenue&Time: Gray Room 3 / 11:30\n\nAbstract: How much noise can a system tolerate before encoded quantum information becomes irrecoverable? This question connects quantum error correction to the stability of quantum matter. In this talk\, I will explore the transition between a recoverable and an irrecoverable phase when a quantum many-body system is subject to symmetry-preserving noise. For Abelian symmetries\, this reconstruction becomes essentially classical: local syndrome data captures the relevant information and maps to familiar statistical-mechanics decoding problems. For non-Abelian symmetries\, the situation is qualitatively different. The noisy state retains hidden fusion information that cannot be read from local syndromes alone. This leads naturally to a hierarchy of measurement protocols\, where increasingly nonlocal measurements reveal progressively more of the fusion structure. I will describe how this perspective gives a framework for comparing reconstruction thresholds and developing error correction protocols for the closely related problem of non-Abelian topological quantum memories.
URL:https://www.ift.uam-csic.es/event/quantum-information-journal-club-quantum-information-transitions-and-the-breakdown-of-non-abelian-topological-quantum-memories/
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:20260924T150000
DTEND;TZID=Europe/Madrid:20260924T160000
DTSTAMP:20260930T235214
CREATED:20260917T072644Z
LAST-MODIFIED:20260924T151332Z
UID:25611-1790262000-1790265600@www.ift.uam-csic.es
SUMMARY:Seminar by Rome Samanta (SSM and INFN Naples): "Topological-defect searches in the mHz (LISA) band"
DESCRIPTION:Title: “Topological-defect searches in the mHz (LISA) band” \nSpeaker: Rome Samanta (SSM and INFN Naples) \nVenue & Time: Red Room | 15:00-16:00 \nAbstract: Topological defects\, such as domain walls and cosmic strings\, generically arise in a wide range of field-theory and particle-physics models. One of their most intriguing features is their potential to produce stochastic gravitational-wave backgrounds. If formed in the early Universe\, these defects can generate broad-band gravitational-wave spectra whose present-day signatures may fall within the sensitivity ranges of current experiments\, such as LIGO and pulsar timing arrays (PTAs)\, as well as upcoming detectors including LISA\, the Einstein Telescope (ET)\, and DECIGO. In this talk\, I will discuss the prospects for detecting gravitational-wave signals from topological defects in the LISA frequency band. Although the mHz band is particularly promising for probing early-Universe physics\, it is also expected to contain several astrophysical stochastic backgrounds. Identifying a cosmological signal in the presence of these foregrounds and backgrounds is therefore a nontrivial inference problem. In the first half of the talk\, I will introduce the basic theory of topological defects and discuss Bayesian methods for signal characterization and parameter inference using LISA simulations. In the second half\, I will focus on the detection prospects for one particular class of defects\, domain walls\, and one of their variants\, highlighting their characteristic gravitational-wave signatures and the challenges involved in distinguishing them from astrophysical backgrounds.
URL:https://www.ift.uam-csic.es/event/seminar-by-rome-samanta-ssm-and-infn-naples/
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:20260928T150000
DTEND;TZID=Europe/Madrid:20260928T160000
DTSTAMP:20260930T235214
CREATED:20260914T131958Z
LAST-MODIFIED:20260928T143014Z
UID:25573-1790607600-1790611200@www.ift.uam-csic.es
SUMMARY:Seminar: Alba Cervera Lierta [Barcelona Supercomputing Centre]: "Quantum Information as a Guiding Principle (and a Tool) for Fundamental Interactions"
DESCRIPTION:Title: “Quantum Information as a Guiding Principle (and a Tool) for Fundamental Interactions” \nSpeaker: Alba Cervera Lierta [Barcelona Supercomputing Centre] \nVenue & Time: Red Room | 15:00-16:00 \nAbstract: The interactions of the Standard Model are usually presented as consequences of gauge symmetry. In this talk I explore a complementary viewpoint: fundamental interactions are quantum\, and the S-matrix generates quantum-information resources\, such as entanglement or “magic” (non-stabilizerness)\, among the particles it scatters. I show that in tree-level QED\, electroweak\, QCD and perturbative gravity processes\, requiring these resources to be extremal is enough to recover gauge and diffeomorphism invariance\, and to provide a bound on the weak mixing angle\, suggesting quantum information may act as a guiding principle behind the couplings we observe.\nI then turn the argument around: can these same quantities serve as a tool? Colliders have become genuine quantum-information laboratories (entanglement and magic in top-quark pairs are now measured at the LHC) and I discuss how such observables probe physics beyond the Standard Model. As a concrete example\, I present a new collider observable built from the spin density matrix of the top-antitop system\, designed to search for invisible particles produced alongside a top-quark pair\, and show it outperforms standard rate- and kinematics-based searches.
URL:https://www.ift.uam-csic.es/event/seminar-alba-cervera-lierta-barcelona-supercomputing-centre/
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:20260930T111500
DTEND;TZID=Europe/Madrid:20260930T160000
DTSTAMP:20260930T235214
CREATED:20260910T105732Z
LAST-MODIFIED:20260930T144617Z
UID:25553-1790766900-1790784000@www.ift.uam-csic.es
SUMMARY:Polygonal Gravity Seminars
DESCRIPTION:Madrid’s Polygonal Gravity Seminar Series\nWednesday\, September 30th. Red Room (IFT)\n  \n11:15h Welcome coffee \n————————- \n11:30h First talk \nSpeaker: Sameer Murthy (Kingś College\, London) \nTitle: Near-extremal black holes in GR and in string theory \nAbstract:What happens to the thermodynamics of a black hole at very low temperatures as it\napproaches extremality? This question had remained a puzzle for many decades. Recent progress shows\nthat semi-classical physics in the near-extremal limit needs to be revisited due to the appearance\nof nearly gapless modes in the near-horizon of a near-extremal black hole. Upon approaching the\nextremal limit carefully\, one finds that the quantum fluctuations of these gapless modes leads to\nunexpectedly large effects even for a very massive black holes with weakly-curved horizons. In the\nfirst part of this talk\, I will explain this progress and discuss various applications. \nIn the second half of the talk\, I will discuss progress regarding the calculation of entropy of\nsupersymmetric black holes\, which has been one of the big successes of string theory. I will discuss\nhow the counting of entropy in string theory involves a subtlety regarding the supersymmetric index\,\nand how its resolution also involves\, once again\, taking the extremal limit carefully. Finally\, I\nwill discuss how this procedure leads to a new class of supersymmetric solutions corresponding to\nblack holes and black strings. \n  \n————————- \n12:45-14:45 Lunch break and free time \n————————- \n15:00h Second talk \nSpeaker: Luciano Rezzolla (Institute of Theoretical Physics\, Goethe U.\, Frankfurt) \nTitle: Binary Neutron Stars: from macroscopic collisions to microphysics  \nAbstract: I will argue that if black holes represent one the most fascinating implications of\nEinstein’s theory of gravity\, neutron stars in binary system are its richest laboratory\, where\ngravity blends with astrophysics and particle physics. I will discuss the rapid recent progress made\nin modelling these systems and show how the gravitational signal can provide tight constraints on\nthe equation of state and sound speed for matter at nuclear densities\, as well as on one of the most\nimportant consequences of general relativity for compact stars: the existence of a maximum mass.\nFinally\, I will discuss how the merger may lead to a phase transition from hadronic to quark matter.\nSuch a process would lead to a signature in the post-merger gravitational-wave signal and open an\nobservational window on the production of quark matter in the present Universe. \n  \n———————————————– \n16:00h Coffee time \n———————————————– \nMore information about these and following monthly seminars can be found at the  webpage https://sites.google.com/view/polygrav (No registration is needed)
URL:https://www.ift.uam-csic.es/event/polygonal-gravity-seminars-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
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