Mimetic Curvaton

Abstract

In this paper, we investigate the primordial perturbations of inflation model induced from the multi-field mimetic gravity, where there are two field during inflation, and thus both adiabatic and isocurvature perturbation modes are generated. We show that although it is true that the original adiabatic perturbation mode loses the kinetic term due to the constraint equation, by applying the curvaton mechanism where one of the field is viewed as curvaton field, the adiabatic perturbation can actually be transferred from the isocurvature one at the end of inflation. Detailed calculations are performed for both inflationary and the consequent matter-dominant epochs. Therefore, the so-called "non-propagating problem" of the adiabatic mode will actually do no harm to the multi-field mimetic inflation models.

9 pages, 4 figures, looking forward to every comment, have been accepted by Phys. Rev. D

References in corpus (10)

• The Unity of Cosmological Attractors
• Cuscuton: A Causal Field Theory with an Infinite Speed of Sound
• Mimetic gravity: a review of recent developments and applications to cosmology and astrophysics
• Cosmology with Mimetic Matter
• Mimetic $F(R)$ gravity: inflation, dark energy and bounce
• Cuscuton Cosmology: Dark Energy meets Modified Gravity
• Extended mimetic gravity: Hamiltonian analysis and gradient instabilities
• Mimetic dark matter, ghost instability and a mimetic tensor-vector-scalar gravity
• Imperfect Dark Matter
• Higher Derivative Mimetic Gravity

Cited by in corpus (4)

• Interpreting Pulsar Timing Array data of Gravitational Waves with Ekpyrosis-Bouncing Cosmology
• Extensions of two-field mimetic gravity
• Inflationary power spectrum from the Lanczos algorithm
• Krylov complexity of thermal state in early universe