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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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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:20260217T113000
DTEND;TZID=Europe/Madrid:20260217T130000
DTSTAMP:20260405T120716
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:20260405T120716
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:20260405T120716
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:20260405T120716
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:20260405T120716
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:20260405T120716
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:20260405T120716
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:20260405T120716
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:20260405T120716
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:20260405T120716
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:20260405T120716
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:20260405T120716
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:20260405T120716
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:20260405T120716
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:20260405T120716
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:20260405T120716
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:20260405T120716
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:20260405T120716
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:20260405T120716
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:20260405T120716
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:20260405T120716
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:20260405T120716
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
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260312T120000
DTEND;TZID=Europe/Madrid:20260312T130000
DTSTAMP:20260405T120716
CREATED:20260309T070247Z
LAST-MODIFIED:20260309T070310Z
UID:24559-1773316800-1773320400@www.ift.uam-csic.es
SUMMARY:SPS Journal Club: 'Quantum Obstructions to N=1 Infinite Distance Limits'
DESCRIPTION:Strings\, Pheno and the Swampland Journal Club \nTitle: ‘Quantum Obstructions to N=1 Infinite Distance Limits’ \nSpeaker: Jeroen Monnee (U. Hamburg) \nVenue&Time: Red Room / 12:00 \nAbstract: We study limits in the field space of 4d N=1 orientifold compactifications of Type IIB string theory with O3/O7-planes that descend from infinite distance limits in the complex structure moduli space of the underlying Calabi-Yau threefold. In particular\, we investigate the fate of such limits in the quantum-corrected field space. We find that such orientifolds can be grouped into two classes\, dubbed O-type A/B\, whose behaviours vary dramatically at the quantum level. For O-type A limits\, we observe that g_s-corrections become unsuppressed by observing that the degeneration of the geometry in the F-theory lift differs drastically from classical expectations. For O-type B limits we instead observe a similar behaviour for alpha’-corrections\, based on the classical inconsistency of EFT string probes combined with explicit computations of such corrections. Based on upcoming work with Lukas Kaufmann\, Timo Weigand\, and Max Wiesner.
URL:https://www.ift.uam-csic.es/event/quantum-obstructions-n1-infinite-distance-limits/
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:20260312T120000
DTEND;TZID=Europe/Madrid:20260312T150000
DTSTAMP:20260405T120716
CREATED:20260309T064644Z
LAST-MODIFIED:20260309T064644Z
UID:24556-1773316800-1773327600@www.ift.uam-csic.es
SUMMARY:Pheno Journal Club
DESCRIPTION:Every Tuesday at 15:00 in Grey Room 3.
URL:https://www.ift.uam-csic.es/event/pheno-journal-club-10/
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:20260316T150000
DTEND;TZID=Europe/Madrid:20260316T160000
DTSTAMP:20260405T120716
CREATED:20260129T125545Z
LAST-MODIFIED:20260225T163411Z
UID:24308-1773673200-1773676800@www.ift.uam-csic.es
SUMMARY:Seminar: 'Effective Field Theory for Thermal Phase transitions'
DESCRIPTION:Title; ‘Effective Field Theory for Thermal Phase transitions’ \nSpeaker: Mikael Chala (Granada) \nVenue&Time: Red Room / 15:00 \nAbstract: I will present recent progress in applying effective field theory (EFT) to the precise computation of thermal phase transition parameters and the associated gravitational wave spectra. I will also briefly comment on byproducts of this work\, including new methods for two-loop renormalization in EFT or skyrmion degrees of freedom emerging only at finite temperature. \n \n 
URL:https://www.ift.uam-csic.es/event/ift-seminar-mikael-chala-granada/
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:20260317T140000
DTEND;TZID=Europe/Madrid:20260317T150000
DTSTAMP:20260405T120716
CREATED:20260313T184427Z
LAST-MODIFIED:20260313T184427Z
UID:24610-1773756000-1773759600@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-18/
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260318T153000
DTEND;TZID=Europe/Madrid:20260318T170000
DTSTAMP:20260405T120716
CREATED:20260310T094634Z
LAST-MODIFIED:20260318T111901Z
UID:24576-1773847800-1773853200@www.ift.uam-csic.es
SUMMARY:DIFT Colloquium: 'The Mystery of Cosmic Acceleration'
DESCRIPTION:Title: The Mystery of Cosmic Acceleration\n\nSpeaker: Prof. David Weinberg\, The Ohio State University\, USA\n\nDate and time: 15:30h (CET)\, Wednesday\, March 18th\, 2026\n\nLocation: CFTMAT Auditorium\n\nAfter the talk\, we will have a coffee gathering\, providing an opportunity to continue the discussion and interact with the speaker in an informal setting.\n\nZoom link:\nhttps://us02web.zoom.us/j/87376882248?pwd=ydvE94nhe7Wq03As62XTn9aj0Nwgqh.1 \n\nAbstract:\nCosmic acceleration is one of the most surprising cosmological discoveries\nof the past century. Even the “simplest” explanations require new\,\ncosmologically dominant energy components with exotic physical properties.\nCurrent and near-future experiments are seeking clues to the origin of\ncosmic acceleration by measuring the history of expansion and structure\ngrowth with sub-percent precision over a wide span of redshift. I will\nreview the observational methods that underpin these measurements\nand assess the current state of play\, with particular attention to recent\nmeasurements from the Dark Energy Spectroscopic Instrument (DESI) which\nsuggest that the properties of dark energy are evolving at a startling rate.\nI will discuss the prospects and challenges for the new generation of\nexperiments — DESI\, the Euclid mission\, the Vera Rubin Observatory\,\nand the Nancy Grace Roman Space Telescope — which aim to sharpen cosmological\nmeasurements by a factor of ten.
URL:https://www.ift.uam-csic.es/event/dift-colloquium-3/
LOCATION:IFT Auditorium\, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, Madrid\, 28049\,\, Spain
CATEGORIES:Colloquia,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260319T120000
DTEND;TZID=Europe/Madrid:20260319T130000
DTSTAMP:20260405T120716
CREATED:20260313T185336Z
LAST-MODIFIED:20260313T185336Z
UID:24611-1773921600-1773925200@www.ift.uam-csic.es
SUMMARY:SPS Journal Club: 'Axion-Scalar Systems and Dynamical Distances'
DESCRIPTION:Strings\, Pheno and the Swampland (SPS) Journal Club  \nSpeaker: Gonzalo F. Casas (IFT) \nTitle: ‘Axion-Scalar Systems and Dynamical Distances’ \nAbstract: We study the cosmology of axion-scalar pairs\, coupled by a hyperbolic field-space metric and with a string-motivated rational scalar potential. Borrowing tools from the theory of dynamical systems\, we are able to classify all late-time trajectories and extract physical properties of the asymptotic solutions. These results suggest a Dynamical Distance Conjecture: along the physical (possibly non-geodesic) trajectories\, towers of states become exponentially light as a function of the traversed field-space distance. We further rule out possible counterexamples with wildly oscillating solutions. The considered axion-scalar systems are realized in F-theory compactifications\, where the axion-scalar pair is a complex-structure modulus and four-form fluxes induce the asymptotic potentials. We also provide a complete Hodge-theoretic classification of all one-modulus asymptotic potentials of this type.
URL:https://www.ift.uam-csic.es/event/sps-journal-club-axion-scalar-systems-and-dynamical-distances/
CATEGORIES:Journal clubs,Scientific activities
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Madrid:20260319T150000
DTEND;TZID=Europe/Madrid:20260319T160000
DTSTAMP:20260405T120716
CREATED:20260119T104543Z
LAST-MODIFIED:20260310T093507Z
UID:24222-1773932400-1773936000@www.ift.uam-csic.es
SUMMARY:Seminar: 'Beyond the Minimal Axion: Robustness of Standard Predictions'
DESCRIPTION:Title: ‘Beyond the Minimal Axion: Robustness of Standard Predictions’ \nSpeaker: Sung Mook Lee (CERN) \nVenue & Time: Red Room / 15:00 \nAbstract: The QCD axion is one of the most compelling candidates for physics beyond the Standard Model\, as it can simultaneously solve the strong CP problem and account for the dark matter abundance. In the minimal single-axion framework\, especially in a post-inflationary cosmology\, the combination of axion gauge coupling quantization and axion production from string networks leads to sharp and highly predictive targets. In this talk\, we revisit these predictions in a simple but realistic setup with an additional confining dark gauge group and extra axion degrees of freedom. We will show how axion mixing and defect dynamics can modify both the coupling predictions and the relic abundance expectations through emergent features specific to multi axion scenarios\, and discuss when the standard single axion benchmarks remain reliable. This provides a useful test of what remains truly robust in extended axion theories and helps guide current experimental targets.
URL:https://www.ift.uam-csic.es/event/seminar-by-sung-mook-lee/
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:20260323T150000
DTEND;TZID=Europe/Madrid:20260323T160000
DTSTAMP:20260405T120716
CREATED:20251121T121550Z
LAST-MODIFIED:20260319T102754Z
UID:23860-1774278000-1774281600@www.ift.uam-csic.es
SUMMARY:Seminar: 'Observing Quantum Gravity in Extremely Cold Horizons'
DESCRIPTION:Title: ‘Observing Quantum Gravity in Extremely Cold Horizons’ \nSpeaker: Roberto Emparan (Universidad de Barcelona) \nVenue&Time: Red Room / 15:00 \nAbstract: Recent developments have revealed that black holes near extremality exhibit large quantum fluctuations in their geometry\, marking a controllable breakdown of semiclassical quantum field theory in curved spacetime. In this talk\, I will discuss how these fluctuations can be revealed through scattering waves off the black hole. In particular\, we find that extremely cold black holes become transparent to low-frequency light or gravitational radiation. Although such signatures are extraordinarily hard to detect\, they provide concrete signatures of quantum gravity at play in near-extremal regimes.
URL:https://www.ift.uam-csic.es/event/seminar-by-roberto-emparan-universidad-de-barcelona/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
END:VEVENT
END:VCALENDAR