Matter-antimatter asymmetry and other cosmological puzzles via running vacuum cosmologies

Abstract

Current astronomical observations are successfully explained by the present cosmological paradigm based on the concordance model (${\Lambda }_0$CDM + Inflation). However, such a scenario is composed of a heterogeneous mix of ingredients for describing the different stages of cosmological evolution. Particularly, it does not give an unified explanation connecting the early and late time accelerating inflationary regimes which are separated by many aeons. Other challenges to the concordance model include: a singularity at early times or the emergence of the Universe from the quantum gravity regime, the "graceful" exit from inflation to the standard radiation phase, as well as, the coincidence and cosmological constant problems. We show here that a simple running vacuum model or a time-dependent vacuum may provide insight to some of the above open questions (including a complete cosmic history), and also can explain the observed matter-antimatter asymmetry just after the initial deflationary period.

11 pages revtex4. Accepted for publication in IJMPD

References in corpus (8)

• f(R,T) gravity
• Matter creation and cosmic acceleration
• Cosmic acceleration without dark energy: Background tests and thermodynamic analysis
• Nonsingular Decaying Vacuum Cosmology and Entropy Production
• Gravitational Baryogenesis in Running Vacuum models
• Intrinsic problems of gravitational baryogenesis
• The Impact of Particle Production on Gravitational Baryogenesis
• Matter-Antimatter Asymmetry Induced by a Running Vacuum Coupling