Some Aspects of Tachyon Field Cosmology

Abstract

We study inflation, perturbations, non-gaussinity and late-time cosmological dynamics of a tachyon field both minimally and non-minimally coupled to gravity. By analyzing the parameters space of the model, the viability of the model in confrontation with recent observational data is considered. In a dynamical system technique, we study the phase space dynamics of both minimally and non-minimally coupled tachyon field. We find the fixed points (lines in our setup) and explore their stability. Also, we perform a statefinder diagnostic to both cases and show that the trajectories of the state finder pairs reach a stable state which is corresponding to a $\Lambda$CDM scenario.

33 pages, 25 figures, Accepted for publication in Phys. Rev. D

References in corpus (9)

• Dynamics of dark energy
• Are f(R) dark energy models cosmologically viable ?
• Dynamics of interacting dark energy
• Interacting Vector-like Dark Energy, the First and Second Cosmological Coincidence Problems
• Solar System Constraints on Gauss-Bonnet Mediated Dark Energy
• Tachyon Field in Intermediate Inflation
• Modified gravity as realistic candidate for dark energy, inflation and dark matter
• DGP Cosmology with a Non-Minimally Coupled Scalar Field on the Brane
• Crossing the phantom divide

Cited by in corpus (38)

• Perturbation, Non-Gaussianity and Reheating in a GB-$\alpha$-Attractor Model
• Cosmological dynamics of tachyonic teleparallel dark energy
• Gauss-Bonnet Inflation after Planck2018
• A novel teleparallel dark energy model
• $\alpha$-Attractor and Reheating in a Model with Non-Canonical Scalar Fields
• DBI inflation with a non-minimally coupled Gauss-Bonnet term
• Slow-roll inflation in generalized scalar-torsion gravity
• Induced gravity effect on inflationary parameters in an holographic cosmology
• Tachyon inflation with steep potentials
• Tachyon field inflation in the light of BICEP2
• Observational Viability of an Inflation Model with E-Model non-Minimal Derivative Coupling
• Large Non-Gaussianity in Non-Minimally Coupled Derivative Inflation with Gauss-Bonnet Correction
• Tachyon inflation in the Large-$N$ formalism
• Theoretical and observational constraints on Tachyon Inflation
• Constraints on tachyon inflationary models with an AdS/CFT correspondence
• Mimetic DBI Inflation in Confrontation with Planck2018 data
• Non-Minimal Braneworld Inflation after the Planck
• Rejuvenating the hope of a swampland consistent inflated multiverse with tachyonic inflation in the high energy RS-II Braneworld
• Phenomenology analysis of duration inflation for Tachyon field in loop quantum cosmology
• Observational Status of Tachyon Natural Inflation and Reheating
• Higgs inflation model with non-minimal coupling in hybrid Palatini approach
• Tachyon Mimetic Inflation as an Instabilities-Free Model
• Some Aspects of the Tachyon Inflation with Superpotential in Confrontation with Planck2018 Data
• Reconstructing the parameter space of non-analytical cosmological fixed points
• Dynamical System Analysis of Brane Induced Gravity with Tachyon Field
• Tachyon field non-minimally coupled to massive neutrino matter
• Lowering the self-coupling of the scalar field in a generalized Higgs inflation
• Dynamical System Analysis of Randall-Sundrum Model with Tachyon Field on the Brane
• Viable Intermediate Inflation in the Mimetic DBI Model
• Consistency Relation and Non-Gaussianity in a Galileon Inflation
• Intermediate and Power-Law Inflation in the Tachyon Model with Constant Sound Speed
• The Size of Local Bispectrum and Trispectrum in a Non-Minimal Inflation
• Interacting tachyon with varying mass dark matter
• Testing a Two Field Inflation Beyond the Slow-Roll Approximation
• Non-minimally coupled scalar field and scaling symmetry in a cosmological background
• Phase space analysis and cosmography of a two-fluid cosmological model
• A Tachyon Field around the Black Hole
• Testing an Inflation Model with Nonminimal Derivative Coupling in the Light of PLANCK 2015 Data