The cosmological constant filter without big bang singularity

Abstract

In the recently proposed cosmological constant (CC) filter mechanism based on modified gravity in the Palatini formalism, gravity in the radiation, matter and late-time de Sitter eras is insensitive to energy sources with the equation of state -1. This implies that finite vacuum energy shifts from phase transitions are filtered out, too. In this work we investigate the CC filter model at very early times. We find that the initial big bang singularity is replaced by a cosmic bounce, where the matter energy density and the curvature are finite. In a certain case this finiteness can be observed already on the algebraic level.

11+3 pages, 6 figures, one reference added, accepted by Class. Quant. Grav

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Cited by in corpus (6)

• Generalizing the running vacuum energy model and comparing with the entropic-force models
• Ghosts in pure and hybrid formalisms of gravity theories: a unified analysis
• Cosmic acceleration from modified gravity with Palatini formalism
• Confronting the relaxation mechanism for a large cosmological constant with observations
• On the (non-)uniqueness of the Levi-Civita solution in the Einstein-Hilbert-Palatini formalism
• A non-trivial connection for the metric-affine Gauss-Bonnet theory in $D=4$