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Modified Friedmann equation from nonminimally coupled theories of gravity

Orfeu Bertolami*,† and Jorge Páramos‡

  • Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal

  • *Also at Instituto de Plasmas e Física Nuclear, Instituto Superior Técnico, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal.
  • †orfeu.bertolami@fc.up.pt
  • ‡jorge.paramos@fc.up.pt
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Phys. Rev. D 89, 044012 – Published 18 February, 2014

DOI: https://doi.org/10.1103/PhysRevD.89.044012

Abstract

In this work we study how nonminimally coupled theories of gravity modify the usual Friedmann equation, and develop two methods to treat these. The ambiguity in the form of the Lagrangian density of a perfect fluid is emphasized, and the impact of different dominant matter species is assessed. The cosmological constant problem is also discussed.

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Phys. Rev. D 89, 044012– Published 18 February, 2014
  • Received 21 November 2013

© 2014 American Physical Society

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