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• W3201386711 abstract "We investigate the cosmological aspects of the most general parity preserving Metric-Affine Gravity theory quadratic in torsion and non-metricity in the presence of a cosmological hyperfluid. The equations of motion are obtained by varying the action with respect to the metric and the independent affine connection. Subsequently, considering a Friedmann-Lemaitre-Robertson-Walker background, we derive the most general form of the modified Friedmann equations for the full quadratic theory. We then focus on a characteristic sub-case involving only two quadratic contributions given in terms of torsion and non-metricity vectors. In this setup, studying the modified Friedmann equations along with the conservation laws of the perfect cosmological hyperfluid, we provide exact solutions both for purely dilation and for purely spin hypermomentum sources. We then discuss the physical consequences of our model and the prominent role of torsion and non-metricity in this cosmological setup." @default.
• W3201386711 created "2021-09-27" @default.
• W3201386711 creator A5041249765 @default.
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• W3201386711 date "2021-09-14" @default.
• W3201386711 modified "2023-09-27" @default.
• W3201386711 title "The Cosmology of Quadratic Metric-Affine Gravity" @default.
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• W3201386711 hasPublicationYear "2021" @default.
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