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Mimetic inflation

Journal of High Energy Physics volume 2021, Article number: 183 (2021) Cite this article

Abstract

We study inflationary solution in an extension of mimetic gravity with the higher derivative interactions coupled to gravity. Because of the higher derivative interactions the setup is free from the ghost and gradient instabilities while it hosts a number of novel properties. The dispersion relation of scalar perturbations develop quartic momentum correction similar to the setup of ghost inflation. Furthermore, the tilt of tensor perturbations can take either signs with a modified consistency relation between the tilt and the amplitude of tensor perturbations. Despite the presence of higher derivative interactions coupled to gravity the tensor perturbations propagate with the speed equal to the speed of light as required by the LIGO observations. Furthermore, the higher derivative interactions induce non-trivial interactions in cubic Hamiltonian, generating non-Gaussianities in various shapes such as the equilateral, orthogonal and squeezed configurations with observable amplitudes.

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Affiliations

  1. Faculty of Physics, Shahrood University of Technology, P.O. Box 3619995161, Shahrood, Iran

    Seyed Ali Hosseini Mansoori

  2. School of Astronomy, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran, Iran

    Alireza Talebian & Hassan Firouzjahi

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  1. Seyed Ali Hosseini Mansoori
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  2. Alireza Talebian
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Mansoori, S.A.H., Talebian, A. & Firouzjahi, H. Mimetic inflation. J. High Energ. Phys. 2021, 183 (2021). https://doi.org/10.1007/JHEP01(2021)183

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Keywords

  • Cosmology of Theories beyond the SM
  • Classical Theories of Gravity
  • Effective Field Theories