We investigate inflation within f (R, phi)-theories, where a dynamical scalar field is coupled to gravity. A class of models which can support early-time acceleration with the emerging of an effective cosmological constant at high curvature is studied. The dynamics of the field allow for exit from inflation leading to the correct amount of inflation in agreement with cosmological data. Furthermore, the spectral index and tensor-to-scalar ratio of the models are carefully analyzed. A generalization of the theory to incorporate dark matter in the context of mimetic gravity, and further extensions of the latter, are also discussed.

Inflation in f(R,ϕ)-theories and mimetic gravity scenario / Myrzakulov, Ratbay; Sebastiani, Lorenzo; Vagnozzi, Sunny. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 75:9(2015). [10.1140/epjc/s10052-015-3672-6]

Inflation in f(R,ϕ)-theories and mimetic gravity scenario

Sebastiani, Lorenzo;Vagnozzi, Sunny
2015-01-01

Abstract

We investigate inflation within f (R, phi)-theories, where a dynamical scalar field is coupled to gravity. A class of models which can support early-time acceleration with the emerging of an effective cosmological constant at high curvature is studied. The dynamics of the field allow for exit from inflation leading to the correct amount of inflation in agreement with cosmological data. Furthermore, the spectral index and tensor-to-scalar ratio of the models are carefully analyzed. A generalization of the theory to incorporate dark matter in the context of mimetic gravity, and further extensions of the latter, are also discussed.
2015
9
Myrzakulov, Ratbay; Sebastiani, Lorenzo; Vagnozzi, Sunny
Inflation in f(R,ϕ)-theories and mimetic gravity scenario / Myrzakulov, Ratbay; Sebastiani, Lorenzo; Vagnozzi, Sunny. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 75:9(2015). [10.1140/epjc/s10052-015-3672-6]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/356222
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