No significant deviations from the Standard Model predictions have been observed at particle physics experiments, except for neutrino masses. On the other hand, astrophysical evidence for dark matter also points to new physics. In theories beyond the Standard Model of particle physics, neutrino masses and dark matter might have a common origin. Additionally, these theoretical models predict...
Gravitational dynamical friction is expected to cause the orbits of globular clusters to shrink as a function of time. This effect may offer a unique probe of the particle dark matter paradigm. We discuss this effect, and compare the dark matter prediction to observational data of globular cluster-rich, dark matter-dominated dwarf galaxies.
We investigate a novel gravitational wave (GW) production mechanism from gravitons generated during the pre-thermal phase of cosmic reheating, where the energy density is dominated by non-thermalized inflaton decay products, dubbed reheatons. We consider multiple production channels, including: i) pure inflaton-inflaton annihilation, ii) graviton Bremsstrahlung from inflaton decay, iii)...
Cosmological models and predictions rely extensively on the well-established field theory framework of particle physics. However, a qualitatively new challenge arises: cosmological systems inherently contain substances with poorly constrained macroscopic properties and entirely unknown microphysics, such as the inflaton sector, dark matter, and dark energy. This results in a rich array of...
Los rayos cósmicos constituyen un fondo de radiación de extremadamente alta energía que incide sobre la tierra desde más allá del Sistema Solar. Su estudio es de gran importancia por la valiosa información que nos ofrecen del Universo, del Sol y del entorno terrestre cercano. En los años 80 del siglo pasado, J. Linsley sugirió el uso pequeñas redes dispersas de detectores de rayos cósmicos...
In general, Feynman integrals evaluate in terms of complicated transcendental numbers and functions, which arise from their underlying geometries. In this talk, I will first review the type of Feynman integrals that can occur in particle physics phenomenology and in the post-Minkowskian expansion for black-hole scattering. Then, using the methods of differential equations and leading...
El Modelo Cosmológico Estándar, ΛCDM, describe con éxito una amplia gama de observaciones. En este marco, la energía oscura es representada por una constante cosmológica. Sin embargo, resultados recientes de oscilaciones acústicas de bariones (BAO DESI) sugieren que podría tratarse de una componente dinámica. En esta charla se presentan dos modelos parametrizados de energía oscura: uno...
It has been discovered over the last couple of years, that Feynman integrals quite generally admit some non-local symmetries. These turn out to strongly constrain the integral and in many cases can even define them. This gives a new conceptual viewpoint on Feynman integrals and opens up interesting connections to integrability and the theory of hypergeometric functions. In this talk I will...
The study of black hole perturbation theory has seen a resurgence in recent years after the observation of the gravitational waves generated by the coalescence of binary black holes. In this talk, I will summarize some of the recent progress in understanding black hole perturbation theory from the aspect of scattering amplitude and conformal field theory (CFT). First of all, I will review the...
The ∆CDM model, our standard framework for cosmology, has been remarkably successful in describing a vast range of cosmic observations. However, its core assumptions are being challenged by a series of persistent anomalies in observational data. This presentation will provide a comprehensive review of the current status of these cosmological tensions. We will first discuss the recent...
Cluster algebras are beautiful mathematical objects that have proven tremendously successful in describing the singularities of scattering amplitudes in maximally supersymmetric Yang-Mills theory. In this talk, I provide evidence that they also underlie the analytic structure of known 2- and 3-loop contributions to Higgs+jet amplitudes in quantum chromodynamics (QCD). I further demonstrate...
Feynman integrals whose associated geometries extend beyond the Riemann sphere, such as elliptic and Calabi–Yau, are increasingly relevant in modern precision calculations. They arise not only in collider cross-section calculations, but also in the post-Minkowskian expansion of gravitational wave scattering. A powerful approach to compute such integrals is via differential equations,...
