Cosmology of Metric-Affine R+βR2 Gravity with Pure Shear Hypermomentum
Iosifidis D. Myrzakulov R. Ravera L.
January 2024John Wiley and Sons Inc
Fortschritte der Physik
2024#72Issue 1
In this paper, cosmological aspects of metric-affine (Formula presented.) 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 (Formula presented.) is focused, considering purely shear hypermomentum and finding exact solutions in the weak coupling limit.
cosmological hyperfluid , cosmology , hypermomentum , metric-affine gravity , modified gravity
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Laboratory of Theoretical Physics, Institute of Physics, University of Tartu, W. Ostwaldi 1, Tartu, 50411, Estonia
Institute of Theoretical Physics, Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, 54124, Greece
Ratbay Myrzakulov Eurasian International Centre for Theoretical Physics, Nur-Sultan, 010009, Kazakhstan
Eurasian National University, Nur-Sultan, 010008, Kazakhstan
DISAT, Politecnico di Torino, Corso Duca degli Abruzzi 24, Turin, 10129, Italy
INFN, Sezione di Torino, Via P. Giuria 1, Turin, 10125, Italy
Laboratory of Theoretical Physics
Institute of Theoretical Physics
Ratbay Myrzakulov Eurasian International Centre for Theoretical Physics
Eurasian National University
DISAT
INFN
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