Generalized Curvature-Matter Couplings in Modified GravityReport as inadecuate

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Department of Mathematics, University College London, Gower Street, London WC1E 6BT, UK


Centro de Astronomia e Astrofísica da Universidade de Lisboa, Campo Grande, Edifício C8 1749-016 Lisboa, Portugal


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Abstract In this work, we review a plethora of modified theories of gravity with generalized curvature-matter couplings. The explicit nonminimal couplings, for instance, between an arbitrary function of the scalar curvature R and the Lagrangian density of matter, induces a non-vanishing covariant derivative of the energy-momentum tensor, implying non-geodesic motion and, consequently, leads to the appearance of an extra force. Applied to the cosmological context, these curvature-matter couplings lead to interesting phenomenology, where one can obtain a unified description of the cosmological epochs. We also consider the possibility that the behavior of the galactic flat rotation curves can be explained in the framework of the curvature-matter coupling models, where the extra terms in the gravitational field equations modify the equations of motion of test particles and induce a supplementary gravitational interaction. In addition to this, these models are extremely useful for describing dark energy-dark matter interactions and for explaining the late-time cosmic acceleration. View Full-Text

Keywords: modified gravity; curvature-matter couplings; cosmology; dark matter modified gravity; curvature-matter couplings; cosmology; dark matter

Author: Tiberiu Harko 1 and Francisco S.N. Lobo 2,*



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