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Claudio Bonati (University of Pisa)22/12/2025, 14:00
Critical phenomena in statistical models characterized by gauge symmetries present a richer phenomenology than in standard (i.e. non gauge invariant) statistical models. We discuss the main features of this phenomenology and introduce a possible classification of the different types of critical behaviors that can be expected. This classification is related to the nature of the QFT that...
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Ettore Minguzzi (University of Pisa)22/12/2025, 15:00
The global hyperbolicity assumption present in gravitational collapse singularity theorems is in tension with the quantum mechanical phenomenon of black hole evaporation. In this talk I show that the causality conditions in Penrose's theorem can be almost completely removed. As a result, it is possible to infer the formation of spacetime singularities even in absence of predictability and...
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Diego Buccio (Heidelberg University)22/12/2025, 16:00
Running couplings were introduced in quantum field theory to preserve perturbativity in scattering amplitudes, despite the appearance of large logs of external momenta. It is commonly believed that such logarithms are directly related to UV divergencies in one-loop perturbation theory. However, this is not completely true in higher derivative theories: on the one hand, large logs can also...
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Marco Calzà (University of Trento)22/12/2025, 16:30
Primordial black holes (PBHs) are usually assumed to be described by the Schwarzschild or Kerr metrics, which, however, feature unwelcome singularities. We study the possibility that PBHs are nonsingular objects, considering phenomenological, regular tr- and non-tr-symmetric metric space-times. We characterize the evaporation of these PBHs and constrain their abundance from γ-ray observations....
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Gabriele Giacometti (Istituto Nazionale di Fisica Nucleare)22/12/2025, 17:00
The Asymptotic Safety scenario offers a clear way to describe Quantum Gravity that reaches completion in the ultraviolet and also links up with the matter content of the Standard Model. In this work we follow how the Renormalization Group changes when Quantum gravity couples to an SU(5) Grand Unified Theory. We check whether the dimensionless Newton constant g, the cosmological constant λ and...
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Dario Sauro (University of Jena)22/12/2025, 17:30
We derive the local part of the trace of the second Seeley-DeWitt heat kernel coefficient for non-minimal second operators in a completely model-independent way. Afterwards, we provide two examples to show how our result can be applied in practical scenarios. We also present some aspects of the implementation in Mathematica of the model-independent result.
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Davide Campanella Galanti22/12/2025, 18:00
We study the quantum backreaction of a gauge field coupled to a pseudoscalar inflaton during slow-roll axion inflation. Using a fully gauge-invariant approach up to second order in perturbation theory, we include both inflaton and scalar metric fluctuations. We consider physical observers comoving with the inflaton field, allowing a consistent definition of the effective expansion rate. We...
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Guilherme Leite Pimentel (Scuola Normale Superiore)23/12/2025, 09:00
I will show how a Grassmannian turns out to be the natural kinematic space for describing correlation functions of massless spinning particles, in four dimensional (Anti)-de Sitter space. In this kinematic space, tree-level cosmological correlators factorize in a simple way and can be bootstrapped with rather ease, revealing some hidden beauty.
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Ugo Moschella (Istituto Nazionale di Fisica Nucleare)23/12/2025, 10:00
I present some recent developments in AdS QFT: two new formulae for two-point functions and their application to compute some Feynman diagrams
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Simony Santos Da Costa (University of Trento)23/12/2025, 11:00
In this work, we investigate the constraining power of future CMB and galaxy surveys on models of quintessential inflation realized within the framework of α-attractors. We analyze how these future datasets will probe the parameter space of α-attractor quintessential inflation, specifically the inflationary potential parameters. Our results demonstrate that the synergy between CMB-S4,...
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Nicole Righi (Scuola Normale Superiore)23/12/2025, 11:30
String axions have been proposed as candidates for solving a number of puzzles in cosmology. In this talk, I will focus on axions as dark matter. After a review on how string axions can occur in our universe, I will provide a string theoretical explanation of dark matter as composed by ultralight axions. Based on the latest bounds, I will show how likely it is for dark matter to be composed of...
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Pierre Béchaz (Istituto Nazionale di Fisica Nucleare)23/12/2025, 12:00
With high precision data about to be released by large scale cosmological surveys, the development of higher order perturbative descriptions of cosmological observables is becoming increasingly important. The so-called Geodesic Light-Cone (GLC) coordinates are a physically motivated set of coordinates accounting for the fact that light-rays propagate on the past light-cone of an observer. They...
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Giacomo Brunello (Scuola Normale Superiore)23/12/2025, 12:30
Accurate modelling of gravitational-wave (GW) signals is essential for extracting masses, spins, and strong-field dynamics from current and future GW detectors. Within the observable-based (KMOC) formalism, gravitational radiation emitted in the scattering of two compact objects is encoded in the Fourier transform of five-point scattering amplitudes. In this talk, I present a novel analytic...
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