4 papers
Wilsonian Cosmology: de Sitter (in)Stability
Jean Alexandre, Lucien Heurtier, Silvia Pla
We develop a (Wilsonian) functional-renormalisation-group framework for scalar cosmology in which quantum fluctuations of a scalar field are coarse-grained on cosmological spacelik…
Effect of the Memory Burden on Primordial Black Hole Hot Spots
Nathaniel Levy, Lucien Heurtier
When primordial black holes (PBHs) evaporate, they deposit energy in the surrounding plasma, leading to temperature gradients, or hot spots, that evolve during the evaporation proc…
Exact Renormalisation Group Evolution of the Inflation Dynamics: Reconciling -Attractors with ACT
Jean Alexandre, Lucien Heurtier, Silvia Pla
We present a non-perturbative framework for the dynamics of slow-roll inflation that consistently incorporates quantum corrections, based on an alternative functional renormalisati…
Running of the spectral index: Reconciling the CMB with the Lyman- Forest
Malcolm Fairbairn, Lucien Heurtier, María Olalla Olea-Romacho
We investigate the scale dependence of the primordial power spectrum by combining \Planck, ACT DR6, SPT-3G, and eBOSS Lyman- forest data, extending sensitivity to smaller comovi…