CosmoFONDUE - Cosmological Fundamental Observables and Novel Discoveries in Universe Evolution

Session

pre-CMB

2A

11 Jun 2025, 09:30

Main auditorium (École de physique, Quai Ernest-Ansermet 24, 1205 Genève, Suisse)

80. Introduction to the very early Universe

Arttu Rajantie

11/06/2025, 09:30

pre-CMB

talk

27. Time-reversed Stochastic Inflation

Baptiste Blachier (UCLouvain (CURL) and LPENS)

11/06/2025, 10:00

pre-CMB

talk

Based on ArXiv 2504.17680, B. Blachier, C. Ringeval (2025)

Cosmic inflation may exhibit stochastic periods during which quantum fluctuations dominate over the semi-classical evolution. Extracting observables in these regimes is a notoriously difficult program as quantum randomness makes them fully probabilistic. However, among all the possible quantum histories, the ones which are relevant...

40. Thermal neutrino interaction rates at NLO and for decoupling temperatures

Greg Jackson (Subatech (CNRS/IN2P3))

11/06/2025, 10:20

pre-CMB

talk

The dynamics of neutrinos and antineutrinos within a QED plasma, around MeV temperatures (just prior to their decoupling), influences several key cosmological observables. Precision studies have become timely, and we recently computed the NLO interaction rate as a function of the neutrino momentum and flavour, finding relative corrections on the few percent level [1]. I will summarise this...

28. Multi-Messenger Signals from Memory Burden: Detectable Small Primordial Black Holes as Dark Matter

Dr Sebastian Zell (Ludwig Maximilian University & Max Planck Institute for Physics, Munich)

11/06/2025, 10:40

pre-CMB

talk

Mounting theoretical evidence suggests that the information stored in black holes suppresses their evaporation rate – a quantum effect known as memory burden. This phenomenon opens up a new window for small primordial black holes (PBHs) below $10^{15}\, \text{g}$ as viable dark matter candidates. In this talk, I will discuss observational signals from such small PBHs. Beyond constraints from...