121 research outputs found
Unimodular gravity
In this paper we study a modified version of unimodular general relativity in
the context of , denoting the Gauss-Bonnet invariant. We attach
attention to Bianchi-type I and Friendmann-Robertson-Walker universes and
search for unimodular models according to the de Sitter and power-law
solutions. Assuming unimodular gravity as perfect fluid and making use
of the slow-roll parameters, inflationary model has been reconstructed in
concordance with the Planck observational data. Moreover, we investigate the
realization of the bounce and loop quantum cosmological ekpyrotic paradigms.
Assuming suitable and appropriated scale factors, unimodular models able
to reproduce superbounce and ekpyrotic scenarios have been reconstructed.Comment: 14 page
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