Viable Mimetic Completion of Unified Inflation-Dark Energy Evolution in Modified Gravity

Abstract

In this paper, we demonstrate that a unified description of early and late-time acceleration is possible in the context of mimetic $F(R)$ gravity. We study the inflationary era in detail and demonstrate that it can be realized even in mimetic $F(R)$ gravity where traditional $F(R)$ gravity fails to describe the inflation. By using standard methods we calculated the spectral index of primordial curvature perturbations and the scalar-to-tensor ratio. We use two $F(R)$ gravity models and as it turns out, for both the models under study the observational indices are compatible with both the latest Planck and the BICEP2/Keck array data. Finally, the graceful exit from inflation is guaranteed by the existence of growing curvature perturbations when the slow-roll era ends.

PRD Accepted

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• Evaluation of cosmological models in $f(R,T)$ gravity in different dark energy scenario
• Cosmic evolution of the logarithmic f(R) model and the dS swampland conjecture
• Imprints of interacting dark energy on cosmological perturbations
• Consistency between black hole and mimetic gravity -- Case of $(2+1)$-dimensional gravity
• New anisotropic star solutions in mimetic gravity
• Further Refining Swampland dS Conjecture in Mimetic f(G) Gravity
• Structure formation in mimetic gravity
• Mimetic DBI Inflation in Confrontation with Planck2018 data
• Direct couplings of mimetic dark matter and their cosmological effects
• Emergent scenario in mimetic gravity
• Multi-field Mimetic Gravity
• Black holes with Lagrange multiplier and potential in mimetic-like gravitational theory: multi-horizon black holes
• Tachyon Mimetic Inflation as an Instabilities-Free Model
• Isotropic stellar model in mimetic theory
• Extensions of two-field mimetic gravity
• From inflation to dark energy in scalar-tensor cosmology
• Mimetic Weyl geometric gravity
• Holographic description of unified early and late universe in viscous mimetic gravity
• Viable Intermediate Inflation in the Mimetic DBI Model
• Dual models for p-form mimetic gravity and their connection to perfect fluids consisting of (p+1)-branes
• First-order formalism and thick branes in mimetic gravity