Preprint
Aug 2026
Wilsonian Cosmology: de Sitter (in)Stability
We develop a (Wilsonian) functional-renormalisation-group framework for scalar cosmology in which quantum fluctuations of a scalar field are coarse-grained on cosmological spacelike hypersurfaces. Integrating out quantum fluctuations with wavelengths smaller than the Hubble radius $H(t)^{-1}$, we obtain an effective sc...
Jean Alexandre, Lucien Heurtier, Silvia Pla
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