O
Orfeu Bertolami
Researcher at University of Porto
Publications - 426
Citations - 14080
Orfeu Bertolami is an academic researcher from University of Porto. The author has contributed to research in topics: Dark matter & Dark energy. The author has an hindex of 56, co-authored 411 publications receiving 13093 citations. Previous affiliations of Orfeu Bertolami include Heidelberg University & University of Oxford.
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Generalized Chaplygin Gas, Accelerated Expansion and Dark Energy-Matter Unification
TL;DR: In this paper, the authors consider the evolution of a universe evolving from a phase dominated by nonrelativistic matter to a cosmological constant via an intermediate period where the effective equation of state is given by $p=\ensuremath{\alpha{-}A/{\ensemath{\rho}}^{\ensemblem{\alpha}},$ where A is a positive constant and $0l √ √ 1/ √ l 1/1.
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Extra force in f(R) modified theories of gravity
TL;DR: In this article, the equation of motion for massive particles in f(R) modified theories of gravity is derived by considering an explicit coupling between an arbitrary function of the scalar curvature, R, and the Lagrangian density of matter.
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Dark energy–dark matter interaction and putative violation of the equivalence principle from the Abell cluster A586
TL;DR: In this article, the equivalence principle is violated in the case of the Abell cluster A586, which exhibits evidence of the interaction between dark matter and dark energy and argues that this interaction implies a violation.
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Nonminimal coupling and quintessence
Orfeu Bertolami,P. J. Martins +1 more
TL;DR: In this paper, the authors analyzed the conditions under which the dynamics of a self-interacting Brans-Dicke field can account for the accelerated expansion of the universe.
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Time-dependent cosmological term
TL;DR: In this article, a Brans-Dicke theory with a scalar-field-dependent cosmological term is considered and solutions of the field equations in a homogeneous and isotropic space-time are obtained and discussed.