Decays of relic particles into neutrinos can leave a strong imprint on the light elements formed during Big Bang Nucleosynthesis (BBN) if the decay happens before recombination. In this talk, I will discuss the effect of injecting neutrinos at lifetimes larger than 10⁴ s, focusing on the disintegration of the light elements. Several key processes are at play, including final-state radiation...
The matter-antimatter asymmetry of the Universe represents one of the main open questions in particle physics and cosmology. In this talk, we will present a novel realization of cold baryogenesis, a mechanism involving the formation and decay of Standard Model SU(2)-textures, that relies on the out-of-equilibrium dynamics during a strong first order electroweak phase transition. By performing...
We introduce a new mechanism where we claim that the Charge-Parity (CP) violation from mechanisms within the Standard Model (SM) is enough to generate the observed baryon asymmetry of the universe—an achievement that no other currently proposed mechanism can match. We use a Mesogenesis framework where the CP violation comes entirely from Standard Model contributions to neutral meson systems....
Motivated by the hint for time-dependent dynamical dark energy from an analysis of the DESI Baryon Accoustic Oscillation (BAO) data together with information from the Cosmic Microwave Background (CMB) and Supernovae (SN), we relax the assumption of a vanishing initial velocity for a quintessence field. In particular we focus on pseudo-Nambu-Goldstone-Boson (PNGB) quintessence in the form of an...
The observation of gravitational waves (GW) from dark sirens provides a novel measurement, complementary to other surveys that are electromagnetic (EM) signal–based. Under the assumption that both observations trace the distribution of matter up to some bias parameters, it is possible to infer cosmological parameters by cross-correlating their density maps.
As the number of resolved GW...
The cosmic microwave background (CMB) spectrum is an extraordinary tool for exploring physics beyond the Standard Model. The exquisite precision of its measurement makes it particularly sensitive to small effects caused by hidden sector interactions. In particular, CMB spectral distortions can unveil the existence of dark photons which are kinetically coupled to the standard photon. In this...
Gravitational particle production provides an ever-present background in non-thermal dark matter studies. I discuss the correspondence between the Starobinsky and Bogolyubov approaches to the problem of inflationary particle production, and derive strong constraints on frameworks with scalar dark relics.
(Based on D. Feiteira, O. Lebedev, arXiv:2503.14652)
In this talk I discuss the constraints imposed by BBN and CMB observations on primordial lepton flavour asymmetries with (approximately) vanishing total lepton number. I show that solving the momentum averaged quantum kinetic equations describing neutrino oscillations and interactions is an accurate approximation to the full momentum-dependent system, and the results reveal a rich flavour...
Cosmological phase transitionscan give rise to intriguing phenomena, such as baryogenesis or a stochastic gravitational wave background, due to nucleation and percolation of vacuum bubbles in the primordial plasma. A key parameter for predicting these relics is the bubble wall velocity, whose computation relies onsolving the Boltzmann equations of the various speciesalong the bubble profile....
We introduce a new mechanism where we claim that the Charge-Parity (CP) violation from mechanisms within the Standard Model (SM) is enough to generate the observed baryon asymmetry of the universe—an achievement that no other currently proposed mechanism can match. We use a Mesogenesis framework where the CP violation comes entirely from Standard Model contributions to neutral meson systems....
The matter-antimatter asymmetry of the Universe represents one of the main open questions in particle physics and cosmology. In this talk, we will present a novel realization of cold baryogenesis, a mechanism involving the formation and decay of Standard Model SU(2)-textures, that relies on the out-of-equilibrium dynamics during a strong first order electroweak phase transition. By performing...
