From inflation to late time acceleration with a decaying vacuum coupled to radiation or matter

Abstract

We consider General Relativity with matter and radiation, one of these fluids being coupled to vacuum. We find that Universe dynamics starts by an inflation phase if the coupled fluid has a negative energy density at early time. Then, there is always a finite scale factor singularity but when vacuum and matter are coupled and matter density behaves like a negative radiation density. Moreover, the convergence to the LCDM model is clearly easier to reach when vacuum is coupled to matter rather than to radiation. Two classes of theories are studied to illustrate these results.

9 pages, 7 figures

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Cited by in corpus (7)

• Nonsingular Decaying Vacuum Cosmology and Entropy Production
• f(R,T) Gravity Model Behaving as a Dark Energy Source
• A Higher Dimensional Cosmological Model for the Search of Dark Energy Source
• From inflation to dark energy in scalar-tensor cosmology
• $\Lambda CDM$ periodic cosmology
• Cosmological Singularities in Brane Gravity
• Decaying vacuum and evolution from early inflation to late acceleration