Instituto de Física Teórica

Dualities and scale-separated AdS3 vacua
2025-09-18 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: George Tringas

Institution: Lehigh U.

Location&Place: Red Room

Abstract:

After the usual paper discussion, our guest George Tringas (Lehigh U.) will give a talk on Dualities and scale-separated AdS3 vacua

Measuring Stochastic Gravitational Wave Backgrounds with Pulsar Timing Arrays
2025-09-18 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: Mauro Pieroni

Institution: IEM-CSIC

Location&Place: Red Room

Abstract:

My talk focuses on using Pulsar Timing Array (PTA) data to measure Gravitational Waves (GWs). In particular, I will focus on Stochastic GW Background (SGWB) measurements. After a general introduction to the topic, I will discuss a new (simplified) approach to constrain SGWBs with PTA data. This methodology significantly reduces the computational cost of the analysis, opening up new avenues to explore the constraining power of PTA experiments. Within this framework, I’ll revisit the constraints current and future PTA experiments can set on cosmological scenarios.

Vacuum stability for gravity compactifications
2025-09-22 15:00 - 16:15 | IFT Seminar Room/Red Room, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
Speaker: Alessandro Tomasiello (Milano Bicocca)

Venue&Time: 15:00 / Red Room

Abstract: Compactifying from higher dimensions typically produces many different vacuum solutions; this leads to multiple possible decay channels, mediated by the nucleation of bubbles. In string theory, the latter can be expanding D-branes. Supersymmetry provides a stabilization mechanism; I will describe how to replicate it for supersymmetry-breaking vacua, with some partial success.

PhD dissertation: Advancing Gravitational Wave Data Analysis and Exploring New Sources
2025-09-24 10:30 - 12:00 | Blue Room, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
Gonzalo Morrás PhD dissertation.

Supervisor: Juan García-Bellido

Venue&Time: Blue Room / 10:30 AM

Abstract: Gravitational wave (GW) astronomy has opened a new window onto the Universe, allowing us to study compact objects and fundamental physics. This thesis develops new methods and models to improve the detection and interpretation of GW signals, with a focus on exotic and underexplored sources. It includes pioneering searches for close hyperbolic encounters, studies of low-mass and sub-solar-mass binaries, analyses of local cosmic effects on merger rates, and the development of advanced waveform models and data analysis algorithms. These contributions enhance our ability to uncover new astrophysical phenomena and will support future GW observations with current and next-generation detectors.

QIJC: Higher Abelian Quantum Double Models: Introduction to the Characterization and Classification of the Ground State Subspace
2025-09-24 11:30 - 12:30 | Gray Room 3, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
Quantum Information Journal Club
Speaker: Javier Ignacio Lorca Espiro (Universidad de la Frontera, Chile)
Venue&Time: Grey Room 3 / 11:30 AM
Abstract: Higher dimensional abelian quantum double models have been shown to be well defined in any finite dimension and exhibit the characteristic behavior of SPT phases models. In this talk, we will introduce the problem and discuss the characterization of the topological ground state subspace and ts classification scheme. We will discuss the connection of these models with pressing problems in condensed matter physics and quantum computation.

Kaluza-Klein Amplitudes in AdS: the Virasoro-Shapiro and the Veneziano Amplitudes
2025-09-24 15:00 - 16:00 | Madrid
Speaker: Bo Wang from Zhejiang U. Inst. Mod. Phys.
Venue&Time: Red Room / 3:00 PM
Abstract:
I will report recent progress on AdS Virasoro-Shapiro and Veneziano amplitudes for half-BPS operators with arbitrary Kaluza-Klein modes. The key ingredient is a bootstrap built directly in the world-sheet representation, together with a novel formalism. This approach yields a structural string description of AdS amplitude and a precise correspondence with correlators in N=4 SYM: at first curvature order we obtain a unique solution. I will also discuss the applications to broader holographic models beyond AdS5*S5.

SPS JC: de Sitter and Machine Learning
2025-09-25 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
SPS Journal Club

Speaker: Bruno De Luca

Venue&Time: Red Room / 12:00

Abstract:
The problem of constructing de Sitter vacua in quantum theories of gravity is constrained by no-go theorems and made computationally challenging by the absence of supersymmetry. A popular approach to make it more tractableis to start from a supersymmetric compactification, such as on a Calabi-Yau manifold. This simplification comes at the price of greatly restricting the allowed physical sources and possible geometries.

In this introduction, I will discuss some of my works on how to break supersymmetry at the compactification scale by directly solving the equations of motion. This allows for more general internal geometries and thus more general physical configurations, including four-dimensional de Sitter vacua supported by Casimir energy on negatively-curved manifolds, and scale-separated AdS4 vacua.

However, describing the corresponding geometries in detail can sometimes require to solve Einstein-like PDEs on non-trivial manifolds. This problem is intractable even numerically, with standard methods. Luckily, Machine Learning is emerging as a method to overcome these difficulties, and we will discuss a recent proposal for using Machine Learning techniques to explicitly construct negatively-curved geometries.

Time permitting, we will also describe the other way around: how we can use insights from physics to design algorithms with broad applicability to Machine Learning and beyond, focusing on optimization and sampling algorithms obtained from energy-preserving chaotic Hamiltonians with non-standard kinetic terms.

Some references:
2501.00093
2104.13380
2212.02511
2201.11137

Stirring up the intracluster medium with substructures
2025-09-25 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: Go Ogiya from Zhejiang University

Venue&Time: Red Room / 3:00 PM

Abstract:
The origin of the turbulent motion of the intracluster medium (ICM) has been a longstanding open question. Stirring by substructures (member galaxies and dark matter subhaloes) orbiting within a galaxy cluster is a possible mechanism to generate and maintain the ICM turbulence. We develop a semi-analytic model considering three processes of energy transfer from substructures to the ICM (dynamical friction, ram pressure, and sloshing), and propagation and dissipation of the deposited energy. The model reproduces the gas velocity structure derived from hydrodynamical simulations. We find that dynamical friction is responsible for explaining the strong turbulence (~ 500 km/s) in the cluster outskirts (> 1 Mpc), while sloshing explains the mild turbulence (~100 km/s) in the cluster centre. In the talk, we will also discuss implications for X-ray observations of the new generation, such as XRISM and eROSITA.

To bind or not to bind, a tale of two nucleons
2025-09-26 11:30 | IFT Seminar Room/Red Room, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
Speaker: André Walker-Loud (LBNL)
Venue&Time: Red Room / 11:30 AM
Abstract: Our ability to understand the emergence of nuclear physics from the Standard Model requires an understanding two nucleon interactions from the underlying quark and gluon degrees of freedom. Due to the non-perturbative nature of QCD at low-energies, the only method to provide such predictions, with quantifiable uncertainties is lattice QCD. Yet the application of lattice QCD to the two-nucleon problem is beset by a number of significant challenges, such that it has remained uncertain whether di-nucleon systems form bound states at pion masses heavier than nature. I will present recent work exploring this question with all varieties of methods in the literature, including the HAL QCD potential method, on a single set of gauge ensembles, enabling for a direct comparison of the methods.

Delta N formalism: non-linear evolution of scalar and tensor perturbations during inflation
2025-09-26 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: Danilo Artigas

Institution: Kyoto University

Location&Place: IFT Seminar Room/Red Room

Abstract:

Linear-perturbation theory has proven to be an extremely powerful tool to compare inflationary models with observational data. Recently, the newcoming high-precision observations call for predictions beyond linear perturbations. Such effects are known to be relevant for example in the production of primordial black holes or scalar-induced gravitational waves. The delta N formalism proposes to capture some of these non-linearities by describing the universe as a set of homogeneous patches evolving independently. After reviewing its formulation, I will apply it to the case of a single scalar field following a slow-roll evolution, briefly interrupted by a phase of ultra-slow roll where the potential is nearly flat. Taking care of the correlation of the patches, I will show how to obtain correlation functions of scalar perturbations. As a final note, I will briefly show how this procedure can also be applied to describe primordial gravitational waves.

LHC Working Group on Forward Physics and Diffraction
2025-09-29 09:00 - 2025-10-02 18:30 | Blue Room, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
The September 29-October 2 2025 four-day workshop in Madrid of the LHC Physics Centre at CERN (LPCC) Forward Physics Working Group provides a forum at CERN for experimental collaborations and theorists to meet and exchange latest results across all topics of forward physics at the LHC.
The workshop will take place at the Institute of Theoretical Physics (Campus de Cantoblanco 28049 Madrid Spain) and we will be hosted by Prof. Agustin Sabio Vera. To come to IFT, you can take Line C-4 (Colmenar Viejo or Alcobendas/San Sebastián de los Reyes), that takes you to the University (Cantoblanco-Universidad Station). You can pick it up in Atocha (main station in the Centre/South of Madrid), Nuevos Ministerios (Paseo de la Castellana) and Chamartín (main station in the North). After Chamartín, the second station is Cantoblanco-Universidad, where you should exit.
More info.

Muon g-2: nuts and bolts and lattice QCD
2025-09-29 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
Speaker: Andreas Kronfeld (Fermilab)
Venue&Time: Red Room / 3:00 PM
Abstract: This seminar consists of two parts. First, it is discussed how various approaches to the hadronic vacuum polarization (HVP) for the anomalous magnetic moment of the muon, g-2, are connected. Second, results for the HVP from lattice QCD are presented, focusing on the work of the Fermilab Lattice, HPQCD, and MILC collaborations.

Seminar by Roberto Vega-Morales
2025-09-29 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
Speaker: Roberto Vega-Morales from Granada U.

Venue&Time: Red Room / 3:00 PM

Abstract: TBA

SPS Journal Club: 'Landau-Ginzburg Models and Flux Vacua'
2025-10-02 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: Muthusamy Rajaguru (IFT Madrid)

Venue&Time: Red Room / 12:00 PM

Abstract: In this talk, I will give an overview of recent progress that has been made in constructing non-geometric flux vacua. In particular, I will focus on type IIB string compactifications where the internal geometry is described by the 2^6 and 1^9 Landau-Ginzburg (LG) models. These LG models have no Kähler moduli and allow us to realize GKP-type vacua explicitly in the interior of the complex structure moduli space. I will summarize the properties of these vacua and their implications for certain Swampland conjectures.

Relevant literature – 2503.16599, 2407.16756, 2407.16758, 2406.03435, 2306.15714, 2203.15818

Fast inference for slow likelihoods with probabilistic machine-learning
2025-10-02 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: Jesús Torrado from IEM-CSIC

Venue&Time: Red Room / 3:00 PM

Abstract: Inference for slow likelihoods can require weeks or months, if possible at all, with traditional Monte Carlo samplers. This would be the case, for example, when fitting expensive non-linear matter spectrum models, or when characterizing individual long-duration GW events. I will introduce a fast machine-learning Bayesian inference algorithm for general non-Gaussian posteriors with a moderate number of parameters. I will present a pedagogical discussion of some general aspects of it, such as dealing with the curse of dimensionality, characterizing a region of interest, or parallelising active learning. I will show that the total number of expensive likelihood evaluations can be reduced by at least two orders of magnitude compared to traditional Monte Carlo methods, at low overhead costs and no pre-training. I will demonstrate its performance on a couple of real cosmological and GW problems.

César Gómez (1954–2025): A rich life in theory
2025-10-03 10:00 - 17:30 | Blue Room, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
Venue&Time: Blue Room / 10:20 – 17:30
More info: workshops.ift.uam-csic.es/CesarGathering/
César Gómez, whose profound contributions to gauge theory, string theory and quantum gravity were matched by his vision and generosity, passed away on 7 April 2025. After earning his PhD in Salamanca, he held positions at Harvard, the IAS and CERN before joining the CSIC in Madrid, where he became a founding member of the Instituto de Física Teórica, his true scientific home.
His career spanned key areas of theoretical physics: from the quantum vacuum in QCD and two-dimensional conformal field theory to holography, black holes and the quantum structure of spacetime. In recent years he embarked on bold new ideas about symmetry breaking and the quantum origin of the universe, entering one of his most creative periods when his life was cut short.
Beyond his scientific achievements, César was a gifted teacher, an inspiring presence at seminars and a remarkable conversationalist. He leaves behind not only a lasting scientific legacy, but also the memory of a colleague and friend who enriched every exchange with curiosity, insight and humanity.
The meeting will be an opportunity to celebrate Cesar’s life and career through the personal recollections of some of his friends and collaborators.
Read CERN’s obituary

Cosmology Journal Club
2025-10-07 14:00 - 15:00, 2025-10-14 14:00 - 15:00, 2025-10-21 14:00 - 15:00 | Discussion room 5th floor, C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, Madrid, 28049, Spain
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.

SPS Journal Club: Symmetric Moduli Spaces, the Swampland Distance Conjecture (...and the Emergent String Conjecture?)
2025-10-09 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: Bernardo Fraiman (IFT)

Venue&Time: Red Room / 12:00

Abstract: For non-compact, locally symmetric moduli spaces M, the set of geodesics and the geometry of the boundary can be completely characterised using group theory. Under the assumption that M is “compactifiable” and some mild conditions on the spectrum of states, we prove the SDC for all locally symmetric spaces. We show that the states necessarily transform in some representation of the local isometry group, and that the convex hull encoding the exponential rate at which the leading tower of states becomes light coincides with the convex hull of the weights of the representation.

In this talk I will discuss briefly some aspects of the proof, the domain of applicability of our assumptions and their limitations. If time permits, I will also explain how the relation between towers and weights allows one to classify moduli spaces, particle state representations and space time dimensions compatible with the Emergent String Conjecture. Based on 2508.18401 and work in progress.

Large neutrino mass in cosmology and keV sterile neutrino dark matter from a dark sector
2025-10-09 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: Thomas Schwetz from Karlsruhe Institute of Technology (KIT)

Venue&Time: Red Room / 3:00 PM

Abstract:
Recent results from cosmology place sever upper bounds on the sum of neutrino masses, starting to be in conflict with lower bounds from neutrino oscillations. If this neutrino tension persists, it may indicate new physics in cosmology and/or neutrino physics. After a brief review of the present state, I discuss a new physics scenario able to explain this tension. It is based on an extended seesaw model for neutrino mass, including a number of massless neutrinos acting as dark radiation, as well as a keV state as a dark matter candidate. The dark sector is brought into equilibrium with neutrinos between BBN and recombination. This scenario predicts a slight increase in the effective number of neutrino species Neff at recombination, potentially detectable byfuture CMB missions.

Holo Club: Explicit Connections Between Krylov and Nielsen Complexity
2025-10-14 11:30 - 13:00 | Gray Room 3, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
Speaker: Le-Chen Qu (IFT)

Venue&Time: Grey Room 3 / 11:30

Abstract: We establish a precise correspondence between Krylov complexity and Nielsen complexity in quantum many-body systems. By identifying the Krylov basis with the generators of elementary gates in Nielsen’s geometric framework, the Krylov complexity of precursor operators acquires a geometric interpretation as the length of straight-line paths in Nielsen geometry. This construction provides an upper bound on Nielsen complexity, which becomes exact in the small-precursor limit. Employing the SYK model as a test case, we demonstrate that the straight-line trajectory satisfies the Nielsen geodesic equation and remains both locally and globally minimizing up to a critical value of $z$, beyond which conjugate points and geodesic loops arise. Within this framework, cost functions quadratic in the Krylov index are further shown to reproduce the conjectured proportionality between the complexity growth rate and the operator size.

Machine Learning and AI Journal Club
2025-10-16 11:00 - 12:00 | Gray Room 1, Instituto de Física Teórica, C/ Nicolás Cabrera 13-15, Cantoblanco, Madrid, Madrid, 28049, Spain
Venue&Time: Grey Room 1

SPS Journal Club: 'Probing the Rigidity of String Theory'
2025-10-16 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: Georgina Staudt (Max Planck Institute Munich)

Venue&Time: Red Room / 12:00

Abstract: We investigate the deformability of the Veneziano amplitude. If string theory is the unique theory of quantum gravity, the tree level amplitudes of weak coupling limits should be non-deformable. We make progress in this direction for tachyon-free superstring theories by deriving a general positivity bound and excluding some specific families of deformations.

DIFT Colloquium: 'Gamma Ray Bursts, Cosmic Rays and the Sociology of Science'
2025-10-16 15:30 - 17:00 | AULA POLIVALENTE UAM, Plaza Mayor Campus de Cantoblanco UAM. C. Einstein, 7, Fuencarral-El Pardo, 28049 Madrid, Madrid, Madrid, 28049,, Spain
Speaker: Álvaro de Rújula from IFT & CERN

Venue & Time: Aula Polivalente UAM
Abstract:
Gamma-Ray Bursts (GRBs) and Cosmic Rays (CRs) are not difficult to comprehend. Quasars and micro-quasars are seen to emit highly relativistic “Cannonballs” (CBs), though the underlying mechanism remains unfathomable. The observation that core-collapse supernovae also emit CBs —plus some trivial relativistic kinematics— provides a successful understanding of GRBs and CRs. The self-defined “official experts” on these fields resist the evidence, in an explicitly inquisitorial way.

This colloquium is related to the I+D+i project whose reference is CEX2020-001007-S, funded by MCIN/AEI/10.13039/501100011033. The topic is framed within the following research line: Origin and composition of the universe: Astroparticles and Cosmology (Astro/Cosmo).

Old Journal Club: 'Renormalization and Effective Lagrangians'
2025-10-16 17:00 - 18:00 | Blue Room, Instituto de Física Teórica (IFT) - C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
Pau Garcia Romeu (IFT) will present Renormalization and Effective Lagrangians by Joseph Polchinski.

Venue&Time: Blue Room / 17:00

Abstract:

There is a strong intuitive understanding of renormalization, due to Wilson, in terms of the scaling of effective lagrangians. We show that this can be made the basis for a proof of perturbative renormalization. We first study renormalizability in the language of renormalization group flows for a toy renormalization group equation. We then derive an exact renormalization group equation for a four-dimensional λø 4 theory with a momentum cutoff. We organize the cutoff dependence of the effective lagrangian into relevant and irrelevant parts, and derive a linear equation for the irrelevant part. A lengthy but straightforward argument establishes that the piece identified as irrelevant actually is so in perturbation theory. This implies renormalizability. The method extends immediately to any system in which a momentum-space cutoff can be used, but the principle is more general and should apply for any physical cutoff. Neither Weinberg’s theorem nor arguments based on the topology of graphs are needed.

More info: https://inspirehep.net/literature/189574

Pheno Journal Club: Coherently enhanced decoherence and cloud substructure of atom interferometers
2025-10-21 15:00 - 16:00 | Gray Room 3, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera, 13-15, Fuencarral-El Pardo, Madrid, 28049,, Spain
Speaker: Pablo Blanco Mas (IFT)

Venue & Time: Grey Room 3 / 15:00

Abstract: We study how coherent scattering of a background gas off an atom (or other matter) interferometer can lead to enhanced signals from phase shifts and contrast loss. We focus on the inclusion of realistic features of atom interferometers such as finite temperature, cloud substructure, and time-dependent cloud radii. The inclusion of these effects, extending beyond the previously considered point-like cloud approximation, naturally allow us to study the smooth transition between the coherent and incoherent scattering regimes. We discuss how the formalism presented herein can be tested in the laboratory (with near-infrared photons or an eV-scale electron gun), and discuss an application for the detection of dark matter interacting via long-range forces.

SPS Journal Club: Inflationary Particle Production and the Swampland
2025-10-23 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: Joaquin Masias (Munich, Max Planck Institute)
Venue&Time: Red Room / 12:00 PM
Abstract: TBA

Bubble wall dynamics from nonequilibrium quantum field theory
2025-10-23 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: Matthias Carosi from Munich, Tech. U.

Venue & Time: Red Room / 15:00

Abstract:

First-order phase transitions in the early universe are a unique probe of physics beyond the Standard Model, with potential implications for electroweak baryogenesis, the formation of primordial black holes, magnetogenesis and the production of dark matter. Upcoming gravitational wave detectors may capture the imprint of such transitions, but to extract theoretical insights from these signals requires a precise understanding of the underlyingdynamics.
In this talk, I show how the language of nonequilibrium quantum field theory, combined with the two-particle-irreducible effective action, provides anatural framework for describing the dynamics of a bubble after nucleation. After a brief introduction to the closed-time-path formalism, I derive the dynamical equations governing the bubble and the plasma, and identify all sources of friction for thebubble expansion. This framework unifies the pre-existing approaches within a single, consistent description. In the ultrarelativistic regime, I demonstrate how to compute the friction induced by the pair production of heavy scalar particles and outline the contributions of particle mixing andtransition radiation.

Recent results on the origin of Galactic CRs from gamma-ray astronomy
2025-10-27 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: Guillem Martí-Davesa (INFN-Trieste)

Venue&Time: Red Room / 15:00

Abstract: Supernovae have traditionally been invoked as the dominant cosmic ray factories within our Galaxy, capable of accelerating protons up to PeV energies. In this seminar we will discuss to what extent such a view holds today, and if alternative source populations could instead be relevant actors. Thus, a comprehensive review of recent findings on supernovae, stellar clusters, and microquasars will be presented, with particular emphasis on observational signatures above GeV energies.
