The CST Bounce Universe model -- a parametric study

Abstract

A bounce universe model with a scale-invariant and stable spectrum of primordial density perturbations was constructed using a consistent truncation of the D-brane dynamics from Type IIB string theory. A coupling was introduced between the tachyon field and the adjoint Higgs field on the D3-branes to lock the tachyon at the top of its potential hill and to model the bounce process, which is known as the Coupled Scalar and Tachyon Bounce (CSTB) Universe. The CSTB model has been shown to be ghost free, and it fulfils the null energy condition; in addition, it can also solve the Big Bang cosmic singularity problem. In this paper we conduct an extensive follow-up study of the parameter space of the CSTB model. In particular we are interested in the parameter values that can produce a single bounce to arrive at a radiation-dominated universe. We further establish that the CSTB universe is a viable alternative to inflation, as it can naturally produce a sufficient number of e-foldings in the locked inflation epoch and in the post-bounce expansion to overcome the four fundamental limitations of the Big Bang cosmology, which are flatness, horizon, homogeneity and singularity, resulting in a universe of the current size.

13pages, 3 figures; reference added, in press in China Physics

References in corpus (26)

• Modified Gravity Theories on a Nutshell: Inflation, Bounce and Late-time Evolution
• Towards a Nonsingular Bouncing Cosmology
• A Critical Review of Classical Bouncing Cosmologies
• Bouncing Universe with Quintom Matter
• Exploring Bouncing Cosmologies with Cosmological Surveys
• A Matter Bounce By Means of Ghost Condensation
• Time Dependent Cosmologies and Their Duals
• Matter Bounce Loop Quantum Cosmology from $F(R)$ Gravity
• Evolution of Metric Perturbations in Quintom Bounce model
• G-Bounce Inflation: Towards Nonsingular Inflation Cosmology with Galileon Field
• AdS Crunches, CFT Falls And Cosmological Complementarity
• Search for Higgs boson off-shell production in proton-proton collisions at 7 and 8 TeV and derivation of constraints on its total decay width
• Holographic Signatures of Cosmological Singularities
• From Big Crunch to Big Bang with AdS/CFT
• Gauge Theory Duals of Cosmological Backgrounds and their Energy Momentum Tensors
• A light NMSSM pseudoscalar Higgs boson at the LHC redux
• Charged Renyi entropies and holographic superconductors
• Asymptotics of d-dimensional Kaluza-Klein black holes: beyond the Newtonian approximation
• Time-dependent AdS/CFT Duality II: Holographic Reconstruction of Bulk Metric and Possible Resolution of Singularity
• Perturbations in Matter Bounce with Non-minimal Coupling
• Lee-Wick radiation induced bouncing universe models
• Fluctuations in a Cosmology with a Space-Like Singularity and their Gauge Theory Dual Description
• Light WIMP searches involving electron scattering
• Big Bounce Genesis and Possible Experimental Tests -- A Brief Review
• Dualities between Scale Invariant and Magnitude Invariant Perturbation Spectra in Inflationary/Bouncing Cosmos
• Bouncing Cosmologies

Cited by in corpus (4)

• A non-singular bouncing cosmology in $f(R,T)$ gravity
• Cosmographic analysis of a closed bouncing universe with the varying cosmological constant in $f(R,T)$ gravity
• Primordial Gravitational Waves Spectrum in the Coupled-Scalar-Tachyon Bounce Universe
• Following the density perturbations through a bounce with AdS/CFT Correspondence