Rencontres de Physique des Particules 2026

Session

Particle cosmology

11 mars 2026, 14:10

1. Review talk: Primordial Black Holes

Dr Yann Gouttenoire (Tel Aviv University)

11/03/2026 14:10

2. Interacting dark sector with intrinsic entropy couplings

Dr Elsa Teixeira (LUPM Montpellier)

11/03/2026 14:50

The persistent discrepancies between predictions of the standard cosmological model and high-precision measurements across multiple probes remain a significant challenge in modern cosmology. Over the past decade, mounting evidence for tensions in key cosmological parameters - derived through both model-dependent and independent methods - has motivated the exploration of extensions to the...

3. Gravitational waves from flavoured SU(2) early-universe phase transitions

Anna CHRYSOSTOMOU (LPTHE)

11/03/2026 15:10

We show that first-order phase transitions generically arise during the breaking of TeV-scale SU(2) flavour gauge symmetries and can generate gravitational-wave signals observable by next-generation detectors. These transitions occur only for order-one flavour gauge couplings: beyond $g_f \sim 1.0-1.5$, one-loop corrections to the quartic interaction dominate the thermal potential and weaken...

17. Constraining long-lived dark sector particles with Lyman-alpha and CMB

Sonali VERMA (Universite Libre de Bruxelles)

11/03/2026 15:30

In this talk [based on 2602.10078], I will show how measurements of the intergalactic medium (IGM) temperature from the Lyman-α forest can be used to constrain long-lived dark sector particles with lifetimes larger than 10¹⁶ s. Such particles deposit energy into the IGM through decays to Standard Model states, thereby modifying its late-time thermal history. I will also revisit constraints on...

30. Quantum (and classical) detection of gravitational waves: scope and limitations

Paolo Bilisco (IPhT - Université Paris-Saclay)

11/03/2026 15:50

LIGO, VIRGO and Kagra (just to name a few) represent outstanding feats of engineering that have launched us in a new era of gravitational-wave (GW) detection. Even so, we may wonder whether their sensitivity is enough to detect very high-frequency signals of beyond-Standard-Model origin, such as those sourced by primordial stochastic GW backgrounds, primordial black holes, or black hole...