Conveners
Reheating and Big-Bang Nucleosynthesis
- Francesco D'Eramo (University of Padua)
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Sara Bianco (DESY-T)29/05/2025, 14:20
Constraints on dark sector particles decaying into neutrinos typically focus on their impact on the effective number of relativistic species, Neff, in the early Universe. However, for heavy relics with longer lifetimes, constraints mainly arise from the photo-disintegration and hadro-disintegration of primordial abundances. The high-energy neutrinos injected by the decay can interact with both...
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Sergio Pastor (IFIC, CSIC-Univ. Valencia)29/05/2025, 14:40
We present an updated analysis of cosmological models with very low reheating scenarios, where TRH∼O(MeV). Our study includes a more precise computation of neutrino distribution functions, leveraging the latest datasets from cosmological surveys. We perform a joint analysis that combines constraints from Big Bang Nucleosynthesis, the Cosmic Microwave Background, and galaxy surveys, alongside...
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Mario Fernandez Navarro (Univeristy of Glasgow)29/05/2025, 15:00
In this talk I discuss the constraints imposed by BBN and CMB observations on primordial lepton flavour asymmetries with 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 structure in stark...
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Maria Jose Fernandez Lozano (JGU Mainz)29/05/2025, 15:20
One of the many compelling mechanisms for dark matter production is the freeze-in mechanism. In contrast to the more widely studied freeze-out scenario, freeze-in production is sensitive to thermal corrections, which can significantly impact the predicted dark matter abundance.
In this talk, we investigate the impact of thermal effects on dark matter production. We consider a model...
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giacomo landini (IFIC and Universidad de Valencia)29/05/2025, 15:40
QCD-like theories in which the dark matter (DM) of the Universe is hypothesized to be a thermal relic in the form of a dark pion has been extensively investigated, with most studies neglecting the CP-violating
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θ-angle associated with the topological vacuum. We point out that a non-vanishing θ could potentially trigger resonant number-changing processes giving rise to the observed relic...