New class of hybrid metric-Palatini scalar-tensor theories of gravity
Autor: | Borowiec, Andrzej, Kozak, Aleksander |
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Rok vydání: | 2020 |
Předmět: | |
Zdroj: | JCAP07(2020)003 |
Druh dokumentu: | Working Paper |
DOI: | 10.1088/1475-7516/2020/07/003 |
Popis: | A class of scalar-tensor theories (STT) including a non-metricity that unifies metric, Palatini and hybrid metric-Palatini gravitational actions with non-minimal interaction is proposed and investigated from the point of view of their consistency with generalized conformal transformations. It is shown that every such theory can be represented on-shell by a purely metric STT possessing the same solutions for a metric and a scalar field. A set of generalized invariants is also proposed. This extends the formalism previously introduced in \cite{kozak2019}. We then apply the formalism to Starobinsky model, write down the Friedmann equations for three possible cases: metric, Palatini and hybrid metric-Palatini, and compare some inflationary observables. Comment: 34 pages in LaTeX, comments and references added, final version published in JCAP |
Databáze: | arXiv |
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