Model for a time-symmetric Milne-like universe without big bang curvature singularity

Abstract

We present a physics model for a time-symmetric Milne-like universe. The model is based on the $q$-theory approach to the cosmological constant problem, supplemented by an assumed vacuum-matter energy exchange possibly due to quantum-dissipative effects. Without fine-tuning of the initial vacuum energy density, we obtain a harmless big bang singularity (with finite values of the Ricci and Kretschmann curvature scalars) and attractor behavior towards Minkowski spacetime. The time-symmetric spacetime manifold of our model may provide the proper setting for a possible CPT-symmetric universe.

16 pages, 4 figures, v3: two appendices added on the thermodynamic arrow of time

References in corpus (2)

• Self-tuning vacuum variable and cosmological constant
• Dynamic vacuum variable and equilibrium approach in cosmology

Cited by in corpus (1)

• Instability of the big bang coordinate singularity in a Milne-like universe