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X-ORIGINAL-URL:https://www.ift.uam-csic.es
X-WR-CALDESC:Events for Instituto de Física Teórica
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TZID:Europe/Madrid
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DTSTART:20250330T010000
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DTSTART:20251026T010000
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TZNAME:CEST
DTSTART:20260329T010000
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DTSTART:20261025T010000
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DTSTART:20270328T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260205T150000
DTEND;TZID=Europe/Madrid:20260205T160000
DTSTAMP:20260406T170732
CREATED:20251121T121740Z
LAST-MODIFIED:20260126T091823Z
UID:23864-1770303600-1770307200@www.ift.uam-csic.es
SUMMARY:Seminar by Yushi Mura (KEK)
DESCRIPTION:Title: ‘UV completion of extended Higgs models via the confinement of SU(2) gauge’ \nSpeaker: Yushi Mura (KEK) \nVenue & Time: Red Room / 15:00 \nAbstract: The extended Higgs sectors are often introduced to explain phenomena beyond the standard model. On the other hand\, the existence of multiple scalar fields may cause the Landau pole below the Planck scale. Therefore\, those models should be replaced by more fundamental theory at high energies. In this talk\, we consider an asymptotic-free SU(2) gauge theory as a UV-completion of the extended Higgs models and assume they are the consequence of confinement of the gauge theory. We find that particle contents of various extended Higgs sectors previously proposed are deduced by each charge assignment of flavor symmetry of the fundamental fermions of the SU(2) gauge symmetry.
URL:https://www.ift.uam-csic.es/event/seminar-by-yushi-mura-kek/
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:20260205T170000
DTEND;TZID=Europe/Madrid:20260205T180000
DTSTAMP:20260406T170732
CREATED:20260202T155203Z
LAST-MODIFIED:20260202T155423Z
UID:24334-1770310800-1770314400@www.ift.uam-csic.es
SUMMARY:Old Journal Club: 'Threshold production of heavy top quarks: QCD and the Higgs boson'
DESCRIPTION:Sergio Rodríguez (IFT) will present “Threshold production of heavy top quarks: QCD and the Higgs boson” by Matthew J. Strassler and Michael E. Peskin. \nAbstract:  \nWe calculate the threshold cross section for 𝑒+𝑒−→tt¯ to leading-logarithmic order in QCD\, using a nonrelativistic approximation suggested by Fadin and Khoze. We study the mass range 100≤𝑚𝑡≤250 GeV\, and show that the cross section is an excellent measure of α𝑠 for the lower portion of the mass range\, while for a heavier top quark it is sensitive to the mass and couplings of the Higgs boson. We argue that a precise determination of 𝑚𝑡 and a measurement of Γ𝑡 are possible. We also show that nonperturbative effects are small\, confirming that the tt¯ threshold is a detailed perturbative test of the standard model. \nMore info: https://journals.aps.org/prd/pdf/10.1103/PhysRevD.43.1500
URL:https://www.ift.uam-csic.es/event/old-journal-club-threshold-production-of-heavy-top-quarks-qcd-and-the-higgs-boson/
LOCATION:Blue 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:20260209T150000
DTEND;TZID=Europe/Madrid:20260209T160000
DTSTAMP:20260406T170732
CREATED:20251128T152946Z
LAST-MODIFIED:20260209T135631Z
UID:23967-1770649200-1770652800@www.ift.uam-csic.es
SUMMARY:Seminar: 'The Muon Magnetic Moment Mystery: a 20-year puzzle in high-energy physics'
DESCRIPTION:Speaker: Zoltan Fodor (Penn State U.) \nVenue & Time: Red Room / 15:00\n\nTitle: The Muon Magnetic Moment Mystery: a 20-year puzzle in high-energy physics \nAbstract: \nIn the last two decades or so there have been stronger and stronger disagreements between direct measurements of the anomalous magnetic moment of the muon and the standard-model prediction. Such a large discrepancy would be a signal for an interaction or particle not present in the standard model. However\, already in 2020 a lattice QCD calculation suggested a “no-tension” scenario. I report on our new lattice QCD calculation\, which reduced the uncertainty of our 2020 result by about 40%. The agreement between the measured value of the anomalous magnetic moment of the muon and its theoretical predictions is an extremely impressive prove of the validity of quantum field theory –with three very different calculational frameworks for QED\, EW and QCD– up to 11 digits.
URL:https://www.ift.uam-csic.es/event/seminar-by-zoltan-fodor-penn-state-u/
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:20260210T113000
DTEND;TZID=Europe/Madrid:20260210T130000
DTSTAMP:20260406T170732
CREATED:20260123T115715Z
LAST-MODIFIED:20260123T115715Z
UID:24284-1770723000-1770728400@www.ift.uam-csic.es
SUMMARY:Holo Club: 'Holographic fluids with higher-form symmetries'
DESCRIPTION:Title: Holographic fluids with higher-form symmetries\n\nSpeaker: André Oliveira (Heriot-Watt University)\n\nVenue & Time: Grey Room 3 / 11:30\n\nAbstract: Higher-form symmetries are ubiquitous in physics. In this talk\, I focus on the case where they are continuous and encode the conservation of extended objects. Applications include elasticity\, superfluidity and phases of electromagnetism. Using holography\, we explore effective descriptions of systems with the simplest case of a single higher-form symmetry. For energies well below temperature\, these descriptions admit a (potentially extended) hydrodynamic regime. We verify this explicitly by studying AlAdS black branes charged under higher-form potentials. In particular\, we compute quasinormal modes\, starting with the low-density limit. Then\, we focus on the bulk dual of a viscoelastic system and analyse instabilities for different equilibrium states corresponding to isotropic crystalline phases.
URL:https://www.ift.uam-csic.es/event/holo-club-holographic-fluids-with-higher-form-symmetries/
LOCATION:Gray Room 3\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Journal clubs
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260210T140000
DTEND;TZID=Europe/Madrid:20260210T150000
DTSTAMP:20260406T170732
CREATED:20260209T072642Z
LAST-MODIFIED:20260209T072653Z
UID:24356-1770732000-1770735600@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. \n 
URL:https://www.ift.uam-csic.es/event/cosmology-journal-club-13/
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:20260212T120000
DTEND;TZID=Europe/Madrid:20260212T130000
DTSTAMP:20260406T170732
CREATED:20260209T072820Z
LAST-MODIFIED:20260209T073110Z
UID:24358-1770897600-1770901200@www.ift.uam-csic.es
SUMMARY:Pheno Journal Club: 'The Cosmic Neutrino Background is within Reach of Future Neutrino Telescopes'
DESCRIPTION:Yuber Perez-Gonzalez (IFT) will present:\n\n‘The Cosmic Neutrino Background is within Reach of Future Neutrino Telescopes’\n\nVenue & Time: Gray Room 3 / 12:00\n\nAbstract: The cosmic neutrino background (CνB) can be boosted to high energies due to scatterings with energetic cosmic rays (CRs) across cosmological scales. Previous calculations focused on neutral current incoherent and coherent elastic scatterings of cosmic-ray protons off relic neutrinos. However\, charged current interactions and deep inelastic scatterings are also expected to occur\, which enhances the boosted relic neutrino fluxes on Earth. Here\, we compute the \textit{total} diffuse boosted cosmic neutrinobackground (DBCνB) arising from CRs at all redshifts in the Universe\, accounting for neutral current and charged current elastic and deep inelastic scatterings. We find that IceCube already places an upper limit on the cosmic neutrino background overdensity in cosmological scales of ~O(100−1000) at Eν=10^10 GeV\, for a lightest neutrino mass of mν≳0.1 eV. We further show that IceCube-Gen2 could test O(1−10) CνB overdensities\, and the combination of 10 future neutrino telescopes with similar sensitivity would allow us to test the ΛCDM expected CνB density for a lightest neutrino mass compatible with the KATRIN bound.\n\nBased on 2601.09790.
URL:https://www.ift.uam-csic.es/event/pheno-journal-club-the-cosmic-neutrino-background-is-within-reach-of-future-neutrino-telescopes/
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:20260212T120000
DTEND;TZID=Europe/Madrid:20260212T130000
DTSTAMP:20260406T170732
CREATED:20260209T073012Z
LAST-MODIFIED:20260209T073012Z
UID:24361-1770897600-1770901200@www.ift.uam-csic.es
SUMMARY:SPS Journal Club: 'Hilltop quintessence\, the LARGE Volume Scenario and varying-tension cosmic strings'
DESCRIPTION:Léo Veissière (IFT) will present:\n\n‘Hilltop quintessence\, the LARGE Volume Scenario and varying-tension cosmic strings’\n\nVenue & Time: Red Room / 12:00\n\nRecent observational data suggests that the dark energy equation of state parameter wDE is evolving with time\, in apparent tension with the ΛCDM standard model of cosmology. Here we review these observational results\, with particular emphasis on the evidence for phantom-like behaviour\, for which wDE < −1. In an attempt to reproduce the data\, we study a quintessence model of a single scalar field rolling down a hilltop potential\, both from a UV-agnostic perspective and from a string theory point-of-view. For the latter we focus on a scalar potential derived from type IIB supergravity in the context of the LARGE Volume Scenario (LVS)\, and investigate the cosmological dynamics of the scalar near its maximum. Finally\, we discuss whether an effective phantom behaviour can be reproduced by considering the interaction between the scalar field and cosmic strings with a time-dependent tension\, while keeping the LVS scalar potential unchanged.
URL:https://www.ift.uam-csic.es/event/sps-journal-club-hilltop-quintessence-the-large-volume-scenario-and-varying-tension-cosmic-strings/
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:20260212T170000
DTEND;TZID=Europe/Madrid:20260212T180000
DTSTAMP:20260406T170732
CREATED:20260209T072454Z
LAST-MODIFIED:20260209T073132Z
UID:24353-1770915600-1770919200@www.ift.uam-csic.es
SUMMARY:Old Journal Club: 'Supersymmetry and morse theory'
DESCRIPTION:Chuying Wang (IFT) will present ‘Supersymmetry and morse theory’ by Edward Witten J. DIFFERENTIAL GEOMETRY 17 (1982) 661-692 \nVenue & Time: Blue Room / 17:00 \nAbstract:  \n  It is shown that the Morse inequalities can be obtained by consideration of a certain supersymmetric quantum mechanics Hamiltonian. Some of the implications of modern ideas in mathematics for supersymmetric theories are discussed.  \nMore info: https://projecteuclid.org/journals/journal-of-differential-geometry/volume-17/issue-4/Supersymmetry-and-Morse-theory/10.4310/jdg/1214437492.pdf
URL:https://www.ift.uam-csic.es/event/old-journal-club-supersymmetry-and-morse-theory/
LOCATION:Blue 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:20260217T113000
DTEND;TZID=Europe/Madrid:20260217T130000
DTSTAMP:20260406T170732
CREATED:20260209T081242Z
LAST-MODIFIED:20260209T081341Z
UID:24366-1771327800-1771333200@www.ift.uam-csic.es
SUMMARY:Holo-Club: 'Toward Krylov-based holography in double-scaled SYK'
DESCRIPTION:Speaker: Yichao Fu (GIST)\n\nTitle: Toward Krylov-based holography in double-scaled SYK\n\nVenue & Time: Gray Room 3 / 11:30\n\nAbstract:\n\nBuilding on the duality between Krylov complexity and geodesic length in Jackiw-Teitelboim and sine-dilaton gravity\, we develop a precise holographic dictionary for quantities in the Krylov subspace of the double-scaled Sachdev-Ye-Kitaev model (DSSYK). First\, we demonstrate that the growth rate of Krylov state complexity corresponds to the wormhole velocity\, and show that its expectation value in coherent states serves as a boundary diagnostic of firewall-like structures via bulk reconstruction. We also delineate an alternative bulk description in terms of the proper momentum of an infalling particle at early times\, establishing a threefold duality between the Krylov complexity growth rate\, wormhole velocity\, and proper momentum\, with clear regimes of validity. Beyond the first moments\, we argue that higher-order Krylov complexities capture connected bulk contributions encoded by replica wormholes\, while the logarithmic variant probes the replica saddle structure. Finally\, within a third-quantized setting incorporating baby universes\, we show that the Krylov entropy equals the von Neumann entropy of the parent-geometry density matrix obtained after tracing out baby universes\, thereby quantifying information flow into the baby universe sector. Together\, these results elevate Krylov-space observables to sharp probes of bulk dynamics and topology in ensemble-averaged 2D gravity.
URL:https://www.ift.uam-csic.es/event/holo-club-toward-krylov-based-holography-in-double-scaled-syk/
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:20260217T140000
DTEND;TZID=Europe/Madrid:20260217T150000
DTSTAMP:20260406T170732
CREATED:20260216T083930Z
LAST-MODIFIED:20260216T083930Z
UID:24402-1771336800-1771340400@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-14/
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:20260218T113000
DTEND;TZID=Europe/Madrid:20260218T123000
DTSTAMP:20260406T170732
CREATED:20260216T083243Z
LAST-MODIFIED:20260216T085842Z
UID:24395-1771414200-1771417800@www.ift.uam-csic.es
SUMMARY:Quantum Information Journal Club: 'Quantum Algorithms Based on Cooling'
DESCRIPTION:Date: Wednesday\, February 18 \nAula Gris 2 / 11:30 \nSpeaker: Daniel Molpeceres (TU Munich) \nTítulo: Quantum Algorithms Based on Cooling \nAbstract: The purpose of this work is to study different methods for nature-inspired algorithmic cooling of physical systems\, which rely on energy transfer between the system and a cool bath. These algorithms are suitable for preparation of QMB ground states\, and are therefore an alternative to other well-known procedures such as variational or adiabatic algorithm\, which have their own limitations. The aim of the paper is to develop this theory\, and try to find in what regimes it works best\, such that it can be used as an alternative or in collaboration with the previous methods. We will focus on a free-fermion model with hoppings in a 1D lattice and a certain distribution of auxiliary systems per site\, try to find regimes in which the system reaches the ground state\, and then extrapolate what we learn from this model into a more general noisy setting. The main questions to address are how the performance changes with the noise that may appear in an experimental setting\, as well as a comparison with other methods such as adiabatic algorithm or QAOA.
URL:https://www.ift.uam-csic.es/event/quantum-information-journal-club-quantum-algorithms-based-on-cooling/
LOCATION:Grey Room 2\, Instituto de Física Teórica\, Madrid\, Madrid\, 28037\, Spain
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260219T120000
DTEND;TZID=Europe/Madrid:20260219T130000
DTSTAMP:20260406T170733
CREATED:20260216T083827Z
LAST-MODIFIED:20260216T083827Z
UID:24400-1771502400-1771506000@www.ift.uam-csic.es
SUMMARY:Pheno Journal Club
DESCRIPTION:Every Thursday at 12:00 in Grey Room 3.
URL:https://www.ift.uam-csic.es/event/pheno-journal-club-7/
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:20260223T150000
DTEND;TZID=Europe/Madrid:20260223T160000
DTSTAMP:20260406T170733
CREATED:20251014T123153Z
LAST-MODIFIED:20260225T163505Z
UID:23328-1771858800-1771862400@www.ift.uam-csic.es
SUMMARY:Seminar: 'Asymmetric Dark Matter induced by Baryogenesis'
DESCRIPTION:Title: ‘Asymmetric Dark Matter induced by Baryogenesis’ \nSpeaker: Miguel Escudero (CERN) \nVenue&Time: Red Room / 15:00 \nAbstract: We live in a Universe where structures are made out of baryons but not of antibaryons. Could the dark matter be made of particles and not antiparticles? This is an old question and many asymmetric dark matter scenarios have been proposed to date. Among them\, the models where a dark matter asymmetry is induced from the baryon/lepton asymmetries are particularly motivated. In this seminar\, I will highlight the motivations for these types of frameworks but also their challenges. I will then present a new\, minimal\, and predictive scenario that we developed in [2511.10731]. In this model\, a dark matter asymmetry is slowly generated from the Standard Model Higgs doublet asymmetry. The scenario features two dark matter states which can lead to signals in the next generation of dark matter experiments\, and we predict a new inert Higgs doublet with mass < 580 GeV which could be produced and observed at the LHC and future colliders. \n \n  \n 
URL:https://www.ift.uam-csic.es/event/seminar-by-miguel-escudero/
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:20260224T140000
DTEND;TZID=Europe/Madrid:20260224T150000
DTSTAMP:20260406T170733
CREATED:20260220T141705Z
LAST-MODIFIED:20260220T141705Z
UID:24438-1771941600-1771945200@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. \n 
URL:https://www.ift.uam-csic.es/event/cosmology-journal-club-15/
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:20260224T150000
DTEND;TZID=Europe/Madrid:20260224T160000
DTSTAMP:20260406T170733
CREATED:20260129T125218Z
LAST-MODIFIED:20260219T111953Z
UID:24306-1771945200-1771948800@www.ift.uam-csic.es
SUMMARY:Seminar: Primordial black holes from Q-balls
DESCRIPTION:Speaker: Shunsuke Neda (ICRR\, Univ. of Tokyo) \nVenue & Time: Red Room / 15:00 \nTitle: Primordial black holes from Q-balls \nAbstract:  \nWe discuss primordial black holes (PBHs) originating from Q-balls\, which are non-topological solitons arising in complex scalar field theories with a global U(1) symmetry. Depending on the cosmic expansion history\, Q-balls can source PBH formation in both early matter-dominated (eMD) and radiation-dominated (RD) universes\, leading to distinct phenomenological consequences. \nIn the eMD scenario\, PBHs produced from Q-balls can account for the observed dark matter abundance\, and we summarize the resulting cosmological constraints. In contrast\, some scenarios of PBHs formed in a radiation-dominated universe exhibit strong PBH clustering. When motivated as seeds of supermassive black holes\, their abundance and spatial distribution are observationally constrained by isocurvature perturbations. For stellar-mass PBHs relevant to LIGO-Virgo-KAGRA\, we compute PBH merger rates in the presence of initial PBH clustering using updated methodologies. \nThis seminar illustrates how PBHs from Q-balls link particle physics models to cosmological\, astrophysical\, and gravitational-wave observations across multiple mass scales.
URL:https://www.ift.uam-csic.es/event/seminar-primordial-black-holes-from-q-balls/
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:20260225T113000
DTEND;TZID=Europe/Madrid:20260225T123000
DTSTAMP:20260406T170733
CREATED:20260220T140817Z
LAST-MODIFIED:20260220T140817Z
UID:24436-1772019000-1772022600@www.ift.uam-csic.es
SUMMARY:Quantum Information Journal Club: 'Generalizing the framework of translationally invariant MPS'
DESCRIPTION:Speaker: Marta Florido Llinás (MPQ) \nTitle: ‘Generalizing the framework of translationally invariant MPS’ \nAbstract: In this talk I will present our recent work on developing a canonical form for uniform matrix product states (MPS) with a boundary matrix (https://www.arxiv.org/abs/2512.11968). Starting from the standard canonical description of uniform MPS with periodic boundary conditions\, I will explain how to derive a generalized canonical form for MPS with boundaries\, by extending the structural analysis of matrix sets to incorporate off-diagonal blocks\, and by introducing some notions inspired by formal language theory.
URL:https://www.ift.uam-csic.es/event/quantum-information-journal-club-generalizing-the-framework-of-translationally-invariant-mps/
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:20260226T110000
DTEND;TZID=Europe/Madrid:20260226T120000
DTSTAMP:20260406T170733
CREATED:20260220T140022Z
LAST-MODIFIED:20260220T140212Z
UID:24432-1772103600-1772107200@www.ift.uam-csic.es
SUMMARY:GRASS Seminar: 'Gravitational Duality at the Lightring\, QNM isospectrality\, and Ringdown Nonlinearities from Penrose Limits'
DESCRIPTION:Gravity\, Supergravity and Superstrings (GRASS) Seminar \nSpeaker: David Pereñiguez (Johns Hopkins U.) \nTitle: ‘Gravitational Duality at the Lightring\, QNM isospectrality\, and Ringdown Nonlinearities from Penrose Limits’ \nAbstract: At high frequencies\, the physics near a black hole’s lightring can be captured by Penrose-limit plane waves adapted to the photon sphere. In this talk\, I will solve exactly the equations for gravitational perturbations in this limit using Penrose’s 2-spinor formalism\, and I will show that the resulting solutions correspond to quasinormal modes (QNMs) in the eikonal regime. I will then prove that gravitational electric–magnetic duality holds on-shell for perturbations at the lightring. This symmetry has long been understood to hold on-shell only for perturbations about flat spacetime. The lightring therefore provides a distinct setting in which it reemerges. In addition\, QNM isospectrality follows as an immediate consequence. I will next extend the analysis to nonlinear gravitational fluctuations\, where the duality is broken\, and compute the excitation of quadratic QNMs\, which are particularly relevant given recent prospects for their detection. I will conclude by discussing further directions in which Penrose limits can be used to sharpen our understanding of lightring physics.
URL:https://www.ift.uam-csic.es/event/grass-seminar-gravitational-duality-at-la-lightring-qnm-isospectrality-and-ringdown-nonlinearities-from-penrose-limits/
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:20260226T120000
DTEND;TZID=Europe/Madrid:20260226T130000
DTSTAMP:20260406T170733
CREATED:20260220T135105Z
LAST-MODIFIED:20260220T135105Z
UID:24428-1772107200-1772110800@www.ift.uam-csic.es
SUMMARY:SPS Journal Club: 'Anomaly-induced vanishing of brane partition functions'
DESCRIPTION:Strings\, Pheno and the Swampland Journal Club (SPS) \nSpeaker: Michelangelo Tartaglia (IFT) \nTitle: ‘Anomaly-induced vanishing of brane partition functions’ \nAbstract: In the presence of ‘t Hooft anomalies\, backgrounds for the symmetries of a quantum field theory can lead to non-conservation of Noether currents\, or more generally\, to the presence of charged insertions in the path integral. When there is a net background charge\, the partition function evaluated on closed manifolds will vanish. For anomalous symmetries\, this statement can also be understood as the anomaly theory giving rise to a non-trivial anomalous phase for the partition function even for “rigid” transformations which leave all background fields unchanged. We use the generalisation of this second viewpoint to the setting of anomalous higher-form symmetries in order to show vanishing of the partition function for a number of examples\, both with and without a Lagrangian description. In particular\, we show how to derive from these considerations the analogue of the Freed-Witten anomaly cancellation condition for the M5-brane\, and also that for the D3-brane in S-fold backgrounds.
URL:https://www.ift.uam-csic.es/event/sps-journal-club-anomaly-induced-vanishing-of-brane-partition-functions/
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:20260226T120000
DTEND;TZID=Europe/Madrid:20260226T130000
DTSTAMP:20260406T170733
CREATED:20260220T141822Z
LAST-MODIFIED:20260220T141822Z
UID:24440-1772107200-1772110800@www.ift.uam-csic.es
SUMMARY:Pheno Journal Club
DESCRIPTION:Every Thursday at 12:00 in Grey Room 3.
URL:https://www.ift.uam-csic.es/event/pheno-journal-club-8/
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:20260226T150000
DTEND;TZID=Europe/Madrid:20260226T160000
DTSTAMP:20260406T170733
CREATED:20260119T110411Z
LAST-MODIFIED:20260225T154031Z
UID:24224-1772118000-1772121600@www.ift.uam-csic.es
SUMMARY:Seminar: 'Sub-PeV gamma-ray astronomy and its physics'
DESCRIPTION:Title: ‘Sub-PeV gamma-ray astronomy and its physics’ \nSpeaker: Sei Kato (Sorbonne Université\, Institut d’Astrophysique de Paris) \nVenue&Time: Red Room / 15:00 \nAbstract: This talk will focus on the physics that can be explored with sub-PeV gamma-ray astronomy (E > 10^14 eV)\, particularly on the Galactic diffuse gamma rays and the dark matter. Also\, our project called ALPACA\, which aims systematic sub-PeV gamma-ray observations in the southern sky for the first time in the world\, is detailedly presented.
URL:https://www.ift.uam-csic.es/event/seminar-by-sei-kato-institut-dastrophysique-de-paris/
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:20260226T170000
DTEND;TZID=Europe/Madrid:20260226T180000
DTSTAMP:20260406T170733
CREATED:20260220T155551Z
LAST-MODIFIED:20260220T155551Z
UID:24442-1772125200-1772128800@www.ift.uam-csic.es
SUMMARY:Old Journal Club: 'Generalized Global Symmetries'
DESCRIPTION:Miquel Aparici Domingo (IFT) will present Generalized Global Symmetries by Davide Gaiotto\, Anton Kapustin\, Nathan Seiberg\, Brian Willett\,  JHEP 02 (2015) 172\n\nAbstract:\nA q-form global symmetry is a global symmetry for which the charged operators are of space-time dimension q\, e.g. Wilson lines\, surface defects\, etc.\, and the charged excitations have q spatial dimensions\, e.g. strings\, membranes\, etc. Many of the properties of ordinary global symmetries (q = 0) apply here. They lead to Ward identities and hence to selection rules on amplitudes. Such global symmetries can be coupled to classical background fields and they can be gauged by summing over these classical fields. These generalized global symmetries can be spontaneously broken (either completely or to a sub-group). They can also have ’t Hooft anomalies\, which prevent us from gauging them\, but lead to ’t Hooft anomaly matching conditions. Such anomalies can also lead to anomaly inflow on various defects and exotic Symmetry Protected Topological phases. Our analysis of these symmetries gives a new unified perspective of many known phenomena and uncovers new results.
URL:https://www.ift.uam-csic.es/event/old-journal-club-generalized-global-symmetries/
LOCATION:Blue 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:20260302T150000
DTEND;TZID=Europe/Madrid:20260302T160000
DTSTAMP:20260406T170733
CREATED:20251128T154934Z
LAST-MODIFIED:20260225T163456Z
UID:23973-1772463600-1772467200@www.ift.uam-csic.es
SUMMARY:Seminar: 'The tensions of LCDM: An update of observations and theoretical implications'
DESCRIPTION:Title: ‘The tensions of LCDM: An update of observations and theoretical implications’ \nSpeaker: Leandros Perivolaropoulos (Ioannina) \nVenue&Time: Red Room / 15:00 \nAbstract: The standard LCDM cosmological model\, despite its success in describing the large-scale structure of the Universe\, is currently challenged by statistically significant discrepancies between early and late-universe observations. In this talk\, I provide a comprehensive update on observational status and theoretical implications of three major tensions: the Hubble (H0) constant discrepancy\, the DESI DR2 Phantom-Crossing Anomaly\, and the S8 tension. First\, I re-examine the H0 tension by classifying 88 Sound-Horizon-Free measurements. This analysis reveals that the discrepancy is not merely an “Early vs. Late” issue but is fundamentally driven by a clash between the Distance Ladder and the majority of other probes (reaching a significance of ~ 6.5\sigma). I will further discuss why simple late-time modifications to the expansion history fail to solve this tension due to constraints from unanchored Type Ia Supernovae (Pantheon+)\, effectively establishing a “no-go” theorem for such solutions.\nSecond\, I address the implications of the recent DESI DR2 data\, which favors a dynamical dark energy equation of state crossing the phantom divide (w(z) < -1). While this behavior is forbidden in simple quintessence models within General Relativity\, I demonstrate how it can be naturally accommodated in reconstructed Scalar-Tensor theories. By allowing for an evolving effective gravitational constant (G_eff)\, these models can fit the phantom crossing while simultaneously alleviating the Hubble tension. Finally\, I review the current landscape of the S8 tension. I discuss the shift toward a “Combined CMB” baseline (Planck + ACT + SPT) which reduces uncertainties\, and analyze the dichotomy currently present in weak lensing surveys (e.g.\, DES Year 6 vs. KiDS Legacy). I conclude by summarizing which theoretical extensions of LCDM remain viable in the face of these combined precision constraints. (edited)
URL:https://www.ift.uam-csic.es/event/seminar-by-leandros-perivolaropoulos-ioannina/
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:20260303T100000
DTEND;TZID=Europe/Madrid:20260303T110000
DTSTAMP:20260406T170733
CREATED:20260302T092721Z
LAST-MODIFIED:20260302T163549Z
UID:24543-1772532000-1772535600@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-16/
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:20260303T113000
DTEND;TZID=Europe/Madrid:20260303T130000
DTSTAMP:20260406T170733
CREATED:20260220T135421Z
LAST-MODIFIED:20260224T152926Z
UID:24430-1772537400-1772542800@www.ift.uam-csic.es
SUMMARY:Holo Club: 'Brick wall Normal Modes and Emerging Thermality'
DESCRIPTION:Speaker: Suman Das (IFT) \nTitle: ‘Brick wall Normal Modes and Emerging Thermality’ \nVenue & Time: Gray Room 1 / 11:00 \nAbstract: \narXiv:2401.01417 \nThe ’t Hooft brick wall model provides one of the earliest microscopic derivations of the black-hole area law within the probe approximation of quantum field theory in curved spacetime. In this talk\, I will revisit the original construction and present a modern perspective based on the spectral properties of the probe fields. After briefly reviewing how the area-proportional entropy arises in ’t Hooft’s setup\, I will show that its origin can be understood in terms of the structure of the normal-mode spectrum. In particular\, a quasi-degenerate growth of states along a specific quantum-number direction leads directly to the area scaling of the entropy.This viewpoint not only clarifies the mechanism behind the entropy but also reveals a number of non-trivial features of the spectrum\, including signatures commonly associated with quantum chaos. I will discuss these features. Finally\, I will show that\, when the brick wall is placed parametrically close to the horizon\, the two-point function of the probe field becomes indistinguishable from a thermal correlator\, providing a precise sense in which thermality emerges in this framework.
URL:https://www.ift.uam-csic.es/event/holo-club-brick-wall-normal-modes-and-emerging-thermality/
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:20260305T113000
DTEND;TZID=Europe/Madrid:20260305T170000
DTSTAMP:20260406T170733
CREATED:20260302T091600Z
LAST-MODIFIED:20260302T091653Z
UID:24538-1772710200-1772730000@www.ift.uam-csic.es
SUMMARY:Shannon's Corner Journal Club
DESCRIPTION:Venue & Time: Gray Room 3 / 11:30 \nSpeaker: Franco Salinas Pytel (UCM) \nAbstract: “The debates between Einstein and Bohr on the foundations of quantum\nmechanics culminated in one of the most iconic statements in the\nhistory of physics: “God does not play dice.” \nIn their seminal 1935 paper\, Albert Einstein\, Boris Podolsky\, and\nNathan Rosen argued that if locality is to be maintained\, then quantum\nmechanics must be incomplete. \nIn this talk\, I will present a concise overview of the original EPR\nargument\, Bell’s theorem and its experimental confirmation. I will\nthen explore quantum non-locality through the framework of XOR games\,\nhighlighting their connections to foundational questions in\nmathematics.”
URL:https://www.ift.uam-csic.es/event/shannons-corner-journal-club/
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:20260305T120000
DTEND;TZID=Europe/Madrid:20260305T130000
DTSTAMP:20260406T170733
CREATED:20260302T092655Z
LAST-MODIFIED:20260309T070430Z
UID:24544-1772712000-1772715600@www.ift.uam-csic.es
SUMMARY:Pheno Journal Club
DESCRIPTION:Every Tuesday at 15:00 in Grey Room 2.
URL:https://www.ift.uam-csic.es/event/pheno-journal-club-9/
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:20260305T120000
DTEND;TZID=Europe/Madrid:20260305T170000
DTSTAMP:20260406T170733
CREATED:20260302T092241Z
LAST-MODIFIED:20260302T092241Z
UID:24541-1772712000-1772730000@www.ift.uam-csic.es
SUMMARY:SPS Journal Club: 'Self-gravitational Effects in the Black Hole-Tower Correspondence'
DESCRIPTION:Strings Pheno and the Swampland Journal Club: ‘Self-gravitational Effects in the Black Hole-Tower Correspondence’ \nVenue&Time: Red Room / 12:00 \nSpeaker: Miquel Aparici (IFT) \nAbstract: It is well-known that in weak coupling and near decompactification limits\, towers of light particles appear in the spectrum of gravitational theories. These towers can be postulated to correspond to minimal black holes in a framework known as the black hole-tower correspondence. We study the transition from towers of particles to black holes and analyze self-gravitational effects of the tower as the EFT cutoff is approached. \n 
URL:https://www.ift.uam-csic.es/event/sps-journal-club-self-gravitational-effects-in-the-black-hole-tower-correspondence/
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:20260305T150000
DTEND;TZID=Europe/Madrid:20260305T170000
DTSTAMP:20260406T170733
CREATED:20251128T154844Z
LAST-MODIFIED:20260225T162954Z
UID:23971-1772722800-1772730000@www.ift.uam-csic.es
SUMMARY:Seminar: 'Cosmological Magnetic Fields from Ultralight Dark Matter'
DESCRIPTION:Title: Cosmological Magnetic Fields from Ultralight Dark Matter \nSpeaker: Robert Brandenberger (McGill) \nVenue&Time: Red Room / 15:00 \nAbstract: A coherently oscillating ultralight dark matter field which couples to electromagnetism in the same way as an axion induces a tachyonic instability which leads to the generation of cosmological magnetic fields immediately after the time of recombination. The mechanism also opens up channels which can facilitate the formation of supermassive black holes.
URL:https://www.ift.uam-csic.es/event/seminar-by-robert-brandenberger-mcgill/
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:20260309T150000
DTEND;TZID=Europe/Madrid:20260309T160000
DTSTAMP:20260406T170733
CREATED:20260119T104415Z
LAST-MODIFIED:20260309T065159Z
UID:24220-1773068400-1773072000@www.ift.uam-csic.es
SUMMARY:Seminar: 'How string theory computes quantum gravity amplitudes'
DESCRIPTION:Title: ‘How string theory computes quantum gravity amplitudes’ \nSpeaker: Lorenz Eberhardt (U. Amsterdam) \nVenue&Time: Red Room / 15:00 \nAbstract: String theory provides a framework in which quantum gravitational scattering amplitudes are ultraviolet finite and computable in perturbation theory. These amplitudes are defined by integrating over the moduli space of Riemann surfaces\, replacing the Feynman diagram expansion of field theory by a sum over worldsheet topologies. I will review how this definition arises and explain structural properties such as UV-finiteness\, dual resonance and their Regge behavior. I will then discuss recent progress in explicit computations\, focusing on one-loop amplitudes and new results on their high-energy behavior.
URL:https://www.ift.uam-csic.es/event/seminar-lorenz-eberhardt-amsterdam/
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:20260310T140000
DTEND;TZID=Europe/Madrid:20260310T150000
DTSTAMP:20260406T170733
CREATED:20260309T064505Z
LAST-MODIFIED:20260309T064505Z
UID:24555-1773151200-1773154800@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-17/
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
END:VCALENDAR