SPS Journal Club: 'Flux Backtracking and Decoupling of Scale Separated AdS Vacua'
2025-11-20 12:00 - 13:00 (Europe/Madrid) | IFT Seminar Room/Red Room, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
Speaker: Fien Apers (IFT)
Venue & Time: Red Room / 12:00
Abstract: I will explain how the flux backtracking method (https://arxiv.org/pdf/2506.03314) can be used to reconstruct the D-brane configuration whose near-horizon region realises the DGKT vacua. As an application, I will show how this reconstructed geometry allows one to verify whether the corresponding D-brane theory decouples from bulk gravity.

Seminar: 'Classical constant electric fields and the Schwinger effect in de Sitter'
2025-11-20 15:00 - 16:00 | IFT Seminar Room/Red Room, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
Speaker: Roberto Vega-Morales
Venue&Time: Red Room / 15:00
Abstract: In this talk I will discuss constant classical electric fields and the Schwinger effect in de Sitter space, which has potential implications for magnetogenesis and inflationary dark matter production. I will first go through the conditions for sustaining a constant electric field in de Sitter space before reviewing the calculation of the Schwinger current, pointing out puzzling results in previous calculations found in the literature and how we have resolved them. I will then comment on current and future directions related to this topic. This talk is based on arXiv:2508.14973.

Old Journal Club en la Facultad: "Rotura de simetría y mecanismo de Higgs"
2025-11-20 17:30 - 18:30
Speaker: Marta F. Zamoro (IFT)
Venue & Time: Aula M15-201. Facultad de Ciencias, UAM / 17:30

2 Minutes Meeting
2025-11-24 10:00 - 13:00
The Institute for Theoretical Physics (IFT) and the Department of Theoretical Physics (DFT) would like to invite you to the “2 Minutes Meeting”, which will take place on Monday, November 24 at 10:00 AM in the Aula Polivalente (UAM).

This event is open to all DFT and IFT members and aims to help us get to know each other better in a relaxed and informal setting. Each participant will have about 2 minutes to introduce themselves and share some of their personal or recreational interests.

If you’d like to use one slide during your brief presentation, you may send one only slide to comunicacion@ift.csic.es before Friday, November 21.

We’ll finish with a coffee at 13:00 PM in the Sala de Profesores – Ramiro Cafeteria.

We hope you’ll take part — it’s a perfect moment to meet and connect with all your colleagues.

Join us!

Seminar: 'Gravitational Lensing of Waves: a new window into cosmology and fundamental physics'
2025-11-24 15:00 - 16:00
Speaker: Miguel Zumalacárregui from Max Planck Institute for Gravitational Physics (Albert Einstein Institute).
Venue&Time: Red Room / 3:00 PM
Abstract: Gravitational lensing, the bending of light by gravity, is essential for interpreting astronomical observations and provides key insight into astrophysics, cosmology, and fundamental physics. A new frontier in gravitational lensing intersects with another key prediction of Einstein’s theory: gravitational waves, fluctuations of space-time produced by the collision of black holes and neutron stars. Like light, gravitational waves are deflected and magnified by the intervening matter distribution, but their unique properties (low frequency, lack of absorption and ab-initio emission models) enable novel signatures and applications. I will present the phenomenology of lensed gravitational waves and the science they will deliver to identify high-redshift sources and probe dark-matter and new gravitational fields. As guiding example I will focus on GW231123: the first compelling lensed black hole merger candidate, its interpretation and consequences.

Cosmology Journal Club
2025-11-25 14:00 - 15:00
Every Tuesday at 2:00 PM in the discussion room on the 5th floor.
Join the IFT cosmology/gravity journal club at benty-fields.com to vote for papers and volunteer to present them.

Pheno Journal Club: 'Is the Strong CP Problem Really a Problem?'
2025-11-25 15:00 - 16:00 | Gray Room 3, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
Speaker: Giulio Barni (IFT)
Venue & Time: 14:30 – 15:30
Abstract: The vanishingly small value of the QCD θ-angle inferred from neutron EDM bounds is usually taken as evidence for the Strong CP Problem, prompting a wide range of proposed solutions. In this talk, I will first review what the Strong CP Problem is: why a generic θ term in QCD leads to large CP violation, and how current experiments force θ ≲ 10e-10. I will then summarize the main solution strategies, including the Peccei–Quinn axion, parity- or CP-based models, and other less conventional ideas. The second part of the talk will focus on a more conceptual question raised in recent years: does the Strong CP Problem actually exist, or could θ be unphysical once confinement and the full structure of QCD are properly taken into account? Building on the recent analysis of Benabou, Hook, Manzari, Murayama and Safdi (arXiv:2510.18951), I will discuss this debate, highlighting what lattice QCD teaches us about θ-dependence, topological sectors, and the neutron EDM.

EDI Trainings: 'Intersectionality. Reflection on identity, privilege and positioning in academia'
2025-11-25 15:30 - 17:00 | Blue Room, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
Speaker: Shannah Khan. Director of Intersect Madrid
Venue & Time: Blue Room / 3:30 PM
Abstract: This workshop offers a space for reflection and dialogue to explore how our personal identities, experiences, and social positions influence the way we participate in academic contexts. Through participatory activities, it seeks to foster a deeper understanding of intersectionality and the role that privilege and position play in our interactions and perspectives within academia.

String, Pheno and the Swampland Journal Club: 'Anomaly-induced vanishing of brane partition functions'
2025-11-27 12:00 - 13:00 | IFT Seminar Room/Red Room, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
Speaker: Michelangelo Tartaglia (IFT)
Venue & Time: Red Room / 12:00
Abstract: 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.

Seminar: Constraining Muon decay parameters from CEvNS measurements at Spallation Sources
2025-11-27 15:00 - 16:00
Speaker: Suraj Prakash, IFIC (Valencia)

Venue&Time: Red Room / 3:00 PM
Abstract: The talk will present a study of the sensitivity of COHERENT-like experiments to non-standard neutrino interactions within the vWEFT framework, i.e. low-energy EFT with additional right-handed Dirac neutrinos. Our analysis incorporates, for the first time, flavor-general New Physics effects in both neutrino production (from pion and muon decays) and neutrino detection, through Coherent Elastic Neutrino-Nucleus Scattering (CEvNS). As a special case, we will highlight how CEvNS data provide an alternative probe for muon decay parameters, for neutrino experiments where muon decay is a source of neutrinos. We will further illustrate how the results can be conveniently formulated in compact form and the ease with which they can be implemented in existing or future analyses using effective nuclear charges. Finally, We will discuss numerical results based on current COHERENT data, and also present estimates for the sensitivity of future measurements.

Seminar: Quantum simulation of lattice gauge theories with Rydberg atom arrays
2025-12-01 15:00 - 16:00 | IFT Seminar Room/Red Room, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
Speaker: Daniel González Cuadra (IFT)
Venue&Time: Red Room / 15:00
Abstract: Lattice gauge theories (LGTs) describe a broad range of phenomena in condensed matter and particle physics. A prominent example is confinement, responsible for bounding quarks inside hadrons such as protons or neutrons. When quark-antiquark pairs are separated, the energy stored in the string of gluon fields connecting them grows linearly with their distance, until there is enough energy to create new pairs from the vacuum and break the string. While such phenomena are ubiquitous in LGTs, simulating the resulting dynamics is a challenging task. In this talk, I will report the observation of string breaking in synthetic quantum matter using a programmable quantum simulator based on neutral atom arrays [Nature 642, 321–326 (2025)]. I will first show how a (2+1)D LGT with dynamical matter can be efficiently implemented when the atoms are placed on a Kagome geometry, with a local U(1) symmetry emerging from the Rydberg blockade, while long-range Rydberg interactions naturally give rise to a linear confining potential between pairs of charges. In the experiment, we probe string breaking in equilibrium by adiabatically preparing the ground state of the atom array in the presence of defects, distinguishing regions within the confined phase dominated by fluctuating strings or by broken string configurations. Finally, by harnessing local control over the atomic detuning, we quench string states and observe string breaking dynamics exhibiting a many-body resonance phenomenon. As an outlook, I will present a roadmap to further explore phenomena in high-energy physics using programmable quantum simulators.

Holo Club: 'Complexity equals anything for multi-horizon black holes'
2025-12-02 11:30 - 13:00 | Gray Room 3, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
Speaker: Hong-Yue Jiang (Lanzhou University)
Venue&Time: 11:30 / Gray Room 3
Abstract: We investigate the “complexity equals anything” proposal with codimension-one and codimension-zero gravitational observables for multi-horizon black holes, using the Bardeen-AdS class black hole as an example. In particular, we compare the results with the “complexity equals volume” (CV) proposal and find that the generalized volume complexitiy enables the probing of a more complete black hole interior, that is, all spacetime regions where the blackening factor $f(r)<0$. This is the advantage brought by the flexibility of this holographic complexity conjecture. In addition, we compute the codimension-zero gravitational observables derived from various geometric quantities and show that these constructions can effectively differentiate the distinct interior regions of the black hole.

Cosmology Journal Club
2025-12-02 14:00 - 15:00 | Discussion room 5th floor, C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, Madrid, 28049, Spain

GRASS Seminar: 'Electric-magnetic duality of dyonic Kerr-Newman-NUT-AdS spacetimes'
2025-12-02 15:00 - 16:00
GRASS (GRAvity, Supergravity & Superstrings) Seminar
Speaker: Cristóbal Andrés Corral (Universidad Adolfo Ibáñez, Chle)
Venue & Time: Red Room / 15:00
Abstract: We discuss the (anti-)self-duality conditions under which the electric and magnetic parts of the conserved charges of the dyonic Kerr-Newman-NUT-AdS solution become equivalent. Within a holographic framework, the stress tensor and the boundary Cotton tensor are computed from the electric/magnetic content of the Weyl tensor. The holographic stress tensor/Cotton tensor duality is recovered along the (anti-)self-dual curve in parameter space. We show that the latter not only implies a duality relation for the mass but also for the angular momentum. The partition function is computed to first order in the saddle-point approximation and a BPS bound is obtained. The ground state of the theory is enlarged to all the (anti-)self-dual configurations when the SO(4) and U(1) Pontryagin densities are introduced. We demonstrate this at the level of the action and variations thereof.

Pheno Journal Club
2025-12-02 15:00 - 16:00 | Gray Room 3, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
Every Tuesday at 15:00 in Grey Room 3.

Quantum Information Journal Club: 'Programming quantum matter made with light and atoms'
2025-12-03 11:30 - 12:30 | Gray Room 3, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
Speaker: Cristian Tabares

Venue & Time: 11:30 / Gray Room 3

Abstract: Current experimental quantum devices do not yet meet the requirements for building fault-tolerant quantum computers, but they can still be used to address many-body problems as analogue quantum simulators. Furthermore, recent experimental advances [1-4] are enabling these simulators to operate in a programmable manner [5], where their dynamics can be used as resources to generate a set of (non-universal) quantum gates. These controllable systems are able to generate highly entangled states, but a natural question is how to use these resources for quantum simulation purposes.

In this seminar we will discuss two different approaches. The first one will be based on state preparation, demonstrating how a classical device can be used to assist the analogue quantum simulator in the task of many-body state preparation [6,7] with variational algorithms. We will focus on fermionic atoms in optical lattices [8], constructing for ground-state preparation of local and extended Fermi-Hubbard models that show considerable improvements with respect to equivalent adiabatic methods. Then, in the second part of the talk, we will introduce an algorithm specifically tailored for analog quantum simulators to accurately recover their ground state properties [9]. Using only global time evolution under a target Hamiltonian, our algorithm avoids the need for local control that is typically required in conventional quantum phase estimation.

These results provide programmable quantum simulators with a new set of tools that further leverage their current capabilities. Overall, our work opens new avenues for analog simulators to make a wider and more efficient exploration of their relevant many-body Hilbert space.

[1] X. Zhang et al., Science 379, 278-283 (2023).
[2] C. Kokail et al., Nature 569, 355–360 (2019).
[3] S. Ebadi et al., Nature 595, 227–232 (2021).
[4] D. Bourgund et al., Nature 637, 57–62 (2025).
[5] A. J. Daley et al., Nature 607, 667–676 (2022).
[6] C. Tabares, A. Muñoz de las Heras, L. Tagliacozzo, D. Porras, and A. González-Tudela, Phys. Rev. Lett. 131, 073602 (2023).
[7] A. Muñoz de las Heras, C. Tabares, J. Schneider, L. Tagliacozzo, D. Porras, and A. González-Tudela., Phys. Rev. Research 6, 013299 (2024).
[8] C. Tabares, C. Kokail, P. Zoller, D. González-Cuadra and A. González-Tudela, PRX Quantum 6, 030356 (2025).
[9] C. Tabares, D. S. Wild, J. I. Cirac, P. Zoller, A. Gonzalez-Tudela, and D. González-Cuadra, arXiv:2511.04434 (2025).

SPS Journal Club: 'On the K-point in moduli space'
2025-12-04 12:00 - 13:00 | IFT Seminar Room/Red Room, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
Speaker: Alessandra Grieco (IFT)

Venue & Time: Red Room / 12:00

Abstract: We study a class of infinite-distance loci, referred to as K-points, in one-parameter complex-structure moduli spaces of type IIB string theory compactified on Calabi-Yau manifolds. We show that around K-points the effective four-dimensional supergravity exhibits certain unusual properties. The two most prominent being that the leading order dependence of the prepotential on the gauge couplings is non-perturbative and that the leading gauge kinetic terms in the action vanish when evaluated on an anti self-dual graviphoton background. These properties are shared with the conifold locus in moduli space, rather than the large complex-structure locus. The conifold locus is well-known to arise from integrating out a charged BPS state, and so the similarities suggest that the K-point also arises from integrating out a BPS state. We develop such an interpretation, finding that it corresponds to a BPS state which is extremely light, whose mass in Planck units is doubly-exponentially small in the distance to the K-point. The state behaves as if it had complex charges, or as if it couples to the self-dual and anti self-dual parts of the graviphoton differently. Assuming such an integrating-out scenario is indeed the correct physics for the K-point, we discuss the implications for our understanding of infinite distances in moduli space and for the Swampland Distance Conjecture.

Seminar: 'The Tolerable Inhomogeneity of the Baryon Asymmetry'
2025-12-04 15:00 - 16:00 | IFT Seminar Room/Red Room, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
Speaker: Stefan Stelzl from EPFL, Lausanne

Venue & Time: Red Room / 15:00

Abstract:

In this talk I present the implications of precision measurements of light element abundances in concordance with the Cosmic Microwave Background for scenarios of physics beyond the Standard Model that generate large inhomogeneities in the baryon-to-photon ratio. We show that precision Big Bang Nucleosynthesis (BBN) imposes strong constraints on any mechanism that produces large scale inhomogeneities at temperatures of the order or below a TeV. In particular, we find that inhomogeneities of the order of at comoving length scales larger than the comoving horizon at the temperature of are in conflict with the measured light element abundances. I then briefly highlight the phenomenological consequences thereof.

Old Journal Club: 'Field Theories with Superconductor Solutions'
2025-12-04 17:00 - 18:00 | Blue Room, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
Lorenzo Paoloni (IFT) will present :“Field Theories with Superconductor Solutions”, Nuovo Cim. 19 (1961) 154–164 de J. Goldstone.
Venue & Time: Blue Room / 17:00

Abstract: The conditions for the existence of non-perturbative type « superconductor » solutions of field theories are examined. A non-covariant canonical transformation method is used to find such solutions for a theory of a fermion interacting with a pseudoscalar boson. A covariant renormalisable method using Feynman integrals is then given. A « superconductor » solution is found whenever in the normal perturbative-type solution the boson mass squared is negative and the coupling constants satisfy certain inequalities. The symmetry properties of such solutions are examined with the aid of a simple model of self-interacting boson fields. The solutions have lower symmetry than the Lagrangian, and contain mass zero bosons.
More info: https://inspirehep.net/literature/12289

31st Xmas Workshop
2025-12-09 09:30 - 2025-12-11 18:00 | Blue Room, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
From December 9th to December 11th 2025 we will celebrate the XXXI edition of our annual Christmas Workshop at the Instituto de Física Teórica (IFT) UAM-CSIC.
Leading experts will meet at the IFT to discuss recent developments in (astro) particle physics, phenomenology, cosmology, string theory, and quantum information.
More info.
Organizers:

Alejandro Bermudez
David Cerdeño
Gregorio Herdoíza
Miguel Montero
Pilar Coloma
Sven Heinemeyer
Yashar Akrami

Confirmed speakers:

Massimo Bianchi (Rome)
Diego Blas (IFAE)
Rebecca Gozzini (IFIC)
Aram Harrow (MIT)
Yolanda Lozano (U Oviedo)
Gonzalo Palma (Chile U.)
Ryan Plestid (CERN)
Carsten Urbach (U. Bonn)
Alexander Westphal DESY)
Giulia Zanderighi (MPI Munich)

posterIFTXmas25.pdf

Joint Colloquium IFT + ICMAT: 'Geometry of gauge theories in two dimensions'
2025-12-12 09:30 - 14:00 | Blue Room, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
Joint ICMAT-IFT Colloquium
After the colloquium, the traditional “Farewell to the Year” party will take place in the CFTMAT cafeteria.
Speaker: Oscar García-Prada (ICMAT-CSIC)
Date: Friday, 12 December 2025 – 12:00
Place: Blue Room
Abstract:
I will describe several geometric aspects of different gauge theories on Riemann surfaces that originate in four-dimensional Yang–Mills theories. A common theme is the appearance of various types of Higgs fields. I will provide some basic mathematical and historical background.

Seminar: 'Active Galactic Nuclei as Laboratories for Fundamental Physics'
2025-12-15 15:00 - 16:00 | IFT Seminar Room/Red Room, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
Speaker: Gonzalo Herrera (MIT & Harvard)
Venue & Time: Red Room / 15:00

Abstract: The vicinity of supermassive black holes at the center of Galaxies represents one of the most extreme environments in the Universe. In Active Galactic Nuclei (AGN), intense gravitational fields, relativistic particle acceleration, strong magnetic fields, and dense ambient gas and radiation coexist in conditions unmatched by other astrophysical sources or Earth-based laboratories. Recent high-energy neutrino observations from the IceCube collaboration and their electromagnetic counterparts from AGN have revolutionized the field of multi-messenger astronomy, providing the first direct window into the hadronic and leptonic processes operating at these cosmic accelerators, and opening new opportunities to test fundamental physics at energies and densities beyond terrestrial reach.
Here I will discuss how these environments can be exploited as laboratories for fundamental physics. I will first focus on dark matter–Standard Model interactions, showing how dark matter scattering with cosmic rays, neutrinos and gamma-rays can can lead to observable signatures on Earth. Second, I will consider other exotic phenomena that may occur independently on the dark matter background in these environments, such as photon-axion-like particle oscillations and microscopic black hole production from cosmic-ray collisions. Finally, I will conclude by showing how AGN can boost the cosmic neutrino background to higher energies via Standard Model processes, giving us a viable and promising pathway to detect the oldest particles in the Universe.

Pheno Journal Club: 'How large can lepton mixing be?'
2025-12-16 15:00 - 16:00 | Gray Room 3, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
Speaker: Sergio Rodríguez Benítez (IFT)
Venue & Time: Grey Room 3 / 15:00
Abstract: We show that, contrary to common expectations, the observed charged leptons can have a substantial mixing with new heavier fermions, at the level of 20%. This can happen, in the language of effective theories, when the effect of mixing with heavier fermions vanishes at tree level in operators of mass-dimension 6 (or it is suppressed by the small charged lepton masses), a cancellation that can be naturally ensured by symmetries. Using a model that realizes this scenario we consider all current direct and indirect constraints and show that experimental constraints on the mixing are so mild that, given the current direct limit on the mass of the heavy fermions, theoretical considerations become the leading current constraints on the mixing. We also estimate the sensitivity to the mixing at future experiments, including the high-luminosity phase of the LHC and, most notably, the FCCee, and FCC-hh. We find a pattern in which the reach of direct searches in hadron machines makes theoretical considerations lead the limits while the precision of lepton machines can beat these theoretical considerations. We find that the FCC can finally reach per milleprecision in the mixing squared of the charged leptons.

Prueba Coloquio
2025-12-22 08:00 - 17:00 | IFT Seminar Room/Red Room, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
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Prueba Journal Club
2025-12-22 08:00 - 2025-12-24 17:00 | Blue Room, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
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Prueba seminario
2025-12-23 08:00 - 2025-12-26 17:00 | Gray Room 1, Instituto de Física Teórica, C/ Nicolás Cabrera 13-15, Cantoblanco, Madrid, Madrid, 28049, Spain
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Prueba workshop
2025-12-26 08:00 - 17:00 | Blue Room, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
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Seminar by Cristina Puchades Ibáñez (University of Mainz)
2026-01-15 15:00 - 16:00
TBA

Seminar by Piotr Toczek (Warsaw University)
2026-01-22 15:00 - 16:00

IFT seminar Ennio Salvioni
2026-01-29 15:00 - 16:00 | IFT Seminar Room/Red Room, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
