Unified cosmology with Non-minimally coupled scalar-tensor theory of gravity

Abstract

Unlike Noether symmetry, a metric independent general conserved current exits for non-minimally coupled scalar-tensor theory of gravity, if the trace of the energy momentum tensor vanishes. Thus, in the context of cosmology, a symmetry exists both in the early vacuum and radiation dominated era. For slow roll, symmetry is sacrificed, but at the end of early inflation, such a symmetry leads to a Friedmann-like radiation era. Late time cosmic acceleration in the matter dominated era is realized in the absence of symmetry, in view of the same decayed and red-shifted scalar field. Thus, unification of early inflation with late time cosmic acceleration with a single scalar field, may be realized.

9 pages, 7 figures

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Cited by in corpus (8)

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• Inflation with F(T) Teleparallel Gravity
• Early universe in view of a modified theory of gravity
• Late-time-accelerated expansion arisen from gauge fields in an anisotropic background and a fruitful trick for Noether's approach
• Constraints on cosmological parameters in light of the scalar-tensor theory of gravity and swampland conjectures
• Inflation and cosmological evolution with $F(R,G)$ gravity theory
• Raychaudhuri-based reconstruction of anisotropic Einstein-Maxwell equation in 1+3 covariant formalism of $f(R)$-gravity
• Phase space of multi-fluid universe in $F(T)$-gravity and some enhancements for the oscillating interaction model