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Enrico Morgante (Università di Trieste & INFN)30/01/2026, 09:30
This talk will focus on axions and axion-like particles. I will discuss recent attempts to enlarge the relevant parameter space of axions, and the cosmological and experimental consequences of these models.
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Daniele Gaggero (Istituto Nazionale di Fisica Nucleare)30/01/2026, 10:00
Future cosmological data will improve the constraining power on new physics.
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On the one hand, forthcoming CMB data from both ground-based and space-based experiments will allow to get closer to the cosmic variance limit. On the other hand, a completely new window will be opened by the forthcoming facilities that will explore the redshifted 21 cm signal from the Cosmic Dawn.
I will present... -
Michela Garramone (Università degli Studi di Torino - Università di Valencia)30/01/2026, 10:12
The aim of this work is to evaluate the effect of a non-standard electron mass $m_e$ in the early Universe picture, in particular considering the neutrino decoupling scenario and Big Bang Nucleosynthesis (BBN).
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In the standard case, neutrino interactions with electrons in the early universe maintain the former in equilibrium with the thermal plasma until before electron-positron pairs... -
Pierre Béchaz (Istituto Nazionale di Fisica Nucleare)30/01/2026, 10:24
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.
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The so-called Geodesic Light-Cone coordinates are a physically motivated set of coordinates which account for the fact that light-rays propagate on the past light-cone of an observer. They... -
Danilo Zecca (Università del Salento)30/01/2026, 11:06
Pulsar timing arrays (PTAs) provide a unique opportunity to search for gravitational waves (GWs) at nanohertz frequencies, opening a new observational window on supermassive black hole binaries (SMBHBs) and other theoretical astrophysical and cosmological sources. Recently, PTA community has announced the detection of a signal compatible with a GW origin, showing evidence for a red noise...
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Ninetta Saviano (Istituto Nazionale di Fisica Nucleare)30/01/2026, 11:18
The exploration of primordial, stochastic gravitational waves opens an extraordinary window into the deep physics of the cosmos, introducing an innovative avenue for advancing our understanding of the physics of the early Universe and examining theoretical fundamental physics. Specifically, the potential detection of gravitational waves across several frequency ranges could yield exclusive...
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Nadir Ijaz (Istituto Nazionale di Fisica Nucleare)30/01/2026, 11:30
We investigate the Stochastic Gravitational Wave Background (SGWB) produced in models of axion inflation coupled to gauge fields. Achieving a detectable signal at Pulsar Timing Array, astrometry, or interferometer frequencies requires a sufficiently strong amplification of the gauge fields, at a level that induces significant backreaction on the inflaton background dynamics. Numerical studies...
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Dr Simone Scarlatella (Istituto Nazionale di Fisica Nucleare)30/01/2026, 11:42
We investigate the quantum-to-classical transition of primordial perturbations
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within a two-field inflationary framework where an adiabatic mode interacts with an entropic environment. In the case of a massive entropic environment, the attractor Bunch–Davies vacuum plays a special role: it is the only state that can undergo full recoherence, whereas all excited initial states exhibit... -
Marco Calo' (Istituto Nazionale di Fisica Nucleare)30/01/2026, 11:54
Modified theories of gravity offer a well-motivated theoretical framework to explore possible deviations from General Relativity and to address open questions in cosmology, in particular the origin of late-time cosmic acceleration. Among these approaches, f(R) gravity represents one of the simplest and most extensively studied extensions, obtained by replacing the Ricci scalar in the...
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30/01/2026, 12:06
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