6 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…
Mass and entropy of asymptotically flat eternal quantum black holes in 2D
Jean Alexandre, Eleni-Alexandra Kontou, Diego Pardo Santos +2
Semi-classical dilaton gravity in (1+1)-dimensions remains one of the only arenas where quantum black holes can be exactly constructed, fully accounting for backreaction due to qua…
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…
Mapping 1+1-dimensional black hole thermodynamics to finite volume effects
Jean Alexandre, Drew Backhouse, Eleni-Alexandra Kontou +2
Both black hole thermodynamics and finite volume effects in quantum field theory violate the null energy condition. Motivated by this, we compare thermodynamic features between two…
Renormalization of the primordial inflationary power spectra
Silvia Pla, Ben A. Stefanek
It has been suggested that the effects of renormalization significantly reduce the amplitude of the inflationary spectra at scales measurable in the cosmic microwave background. Vi…
Double-well instantons in finite volume
Wen-Yuan Ai, Jean Alexandre, Matthias Carosi +2
Assuming a toroidal space with finite volume, we derive analytically the full one-loop vacuum energy for a scalar field tunnelling between two degenerate vacua, taking into account…