Cosmological perturbations in Palatini formalism
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DOI: 10.1088/1475-7516/2021/03/006
Abstract: We investigate cosmological perturbations of scalar-tensor theories in Palatini formalism. First we introduce an action where the Ricci scalar is conformally coupled to a function of a scalar field and its kinetic term and there… read more here.
Keywords: palatini formalism; term; sound speed; formalism ... See more keywords
Scale-invariant quadratic gravity and inflation in the Palatini formalism
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DOI: 10.1103/physrevd.104.023521
Abstract: In the framework of classical scale invariance, we consider quadratic gravity in the Palatini formalism and investigate the inflationary predictions of the theory. Our model corresponds to a two-field scalar-tensor theory, that involves the Higgs… read more here.
Keywords: model; quadratic gravity; scale; palatini formalism ... See more keywords
3+1 decomposition in modified gravities within the Palatini formalism and some applications
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DOI: 10.1103/physrevd.104.024029
Abstract: In the present paper, the 3+1 decomposition of the spacetime onto hypersurface(s) is analysed and established for theories within the Palatini formalism by considering a general function of the Ricci scalar in the gravitational action.… read more here.
Keywords: decomposition; within palatini; modified gravities; decomposition modified ... See more keywords
Cosmology with a new f(R) gravity model in Palatini formalism
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DOI: 10.1142/s0218271822500481
Abstract: One of the most favorable extensions of General Relativity is the [Formula: see text] gravity. [Formula: see text] gravity in Palatini formalism can be a realistic alternative to the dark energy problem. In this work,… read more here.
Keywords: see text; model; gravity; formula see ... See more keywords