Cosmological stealths with nonconformal couplings

Abstract

In this paper we reconsider the existence of stealth fields during the evolution of our Universe by admitting more realistic nonminimal couplings to gravity than the conformal one. In the framework of the FRW cosmology we found that inhomogeneous stealths, as those enabled in the conformal case, are only allowed in de Sitter backgrounds. In particular, it is shown that the homogeneous stealths resulting from nonconformal couplings can coexist with each kind of matter dominant in the several phases characterizing the evolution of our Universe according to the $\Lambda$CDM model.

16 pages, 10 figures Approved to appear at Phys. Rev. D

References in corpus (6)

• Planck 2015 results. XI. CMB power spectra, likelihoods, and robustness of parameters
• Gravitational Cheshire effect: Nonminimally coupled scalar fields may not curve spacetime
• Creation of the universe with a stealth scalar field
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• Massive stealth scalar fields from field redefinition method
• Electromagnetically and gravitationally stealth fields
• Stealth's cosmologies
• A new approach to the thermodynamics of scalar-tensor gravity