Archivio Istituzionale della RicercaIn this paper, cosmological aspects of metric-affine f(R) gravity with hyperfluid are studied. The equations of motion of the theory are obtained by varying the action with respect to the metric and the independent connection. Subsequently, considering a Friedmann-Lemaître-Robertson-Walker background, the modified Friedmann equations in the presence of a perfect cosmological hyperfluid is derived. Especially, a particular case in which f(R) = R + betaR^2 is focused, considering purely shear hypermomentum and finding exact solutions in the weak coupling limit.
Cosmology of Metric-Affine R+βR2 Gravity with Pure Shear Hypermomentum / Iosifidis, D.; Myrzakulov, R.; Ravera, L.. - In: FORTSCHRITTE DER PHYSIK. - ISSN 0015-8208. - STAMPA. - 72:1(2024), pp. 1-11. [10.1002/prop.202300003]
Cosmology of Metric-Affine R+βR2 Gravity with Pure Shear Hypermomentum
Ravera L.
2024
Abstract
In this paper, cosmological aspects of metric-affine f(R) gravity with hyperfluid are studied. The equations of motion of the theory are obtained by varying the action with respect to the metric and the independent connection. Subsequently, considering a Friedmann-Lemaître-Robertson-Walker background, the modified Friedmann equations in the presence of a perfect cosmological hyperfluid is derived. Especially, a particular case in which f(R) = R + betaR^2 is focused, considering purely shear hypermomentum and finding exact solutions in the weak coupling limit.
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https://hdl.handle.net/11583/2992456