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Variable G and Λ: scalar-tensor versus RG-improved cosmology

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Abstract

We study the consequences due to time varying G and Λ in scalar-tensor theories of gravity for cosmology, inspired by the modifications introduced by the Renormalization Group (RG) equations in the Quantum Einstein Gravity. We assume a power-law scale factor in presence contemporarily of both the scalar field and the matter components of the cosmic fluid, and analyze a special case and its generalization, also showing the possibility of a phantom cosmology. In both such situations we find a negative kinetic term for the scalar field Q and, possibly, an equation-of-state parameter w Q < −1. A violation of dominant energy condition (DEC) for Q is also possible in both of them; but, while in the first special case the Q-energy density then remains positive, in the second one we find it negative.

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Authors and Affiliations

  1. Dipartimento di Scienze Fisiche, Università di Napoli, Complesso Universitario di Monte S. Angelo, Via Cintia, Ed. N, I-80126, Napoli, Italy

    Claudio Rubano & Paolo Scudellaro

  2. Istituto Nazionale di Fisica Nucleare, Sez. Napoli, Complesso Universitario di Monte S. Angelo, Via Cintia, Ed. G, I-80126, Napoli, Italy

    Claudio Rubano & Paolo Scudellaro

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  1. Claudio Rubano
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  2. Paolo Scudellaro
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Rubano, C., Scudellaro, P. Variable G and Λ: scalar-tensor versus RG-improved cosmology. Gen Relativ Gravit 37, 521–539 (2005). https://doi.org/10.1007/s10714-005-0040-0

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  • DOI: https://doi.org/10.1007/s10714-005-0040-0

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