Stability analysis and observational constraints in scalar tensor theory

Abstract

We study FRW cosmology for scalar tensor theory where two scalar functions nonminimally coupled to the geometry and matter Lagrangian. In a framework to study stability and attractor solutions of the model in the phase space, we simultaneously solve the dynamical system and best fit the stability and model parameters with the observational data. The approach imposes restrictions on the model constraints while providing information about the universe dynamics. The model predict current accelerating universe, with a phantom crossing in near future.

17 pages, 20 figures, To be published in JCAP

References in corpus (32)

• Extra force in $f(R)$ modified theories of gravity
• Dark energy in modified Gauss-Bonnet gravity: late-time acceleration and the hierarchy problem
• Conditions for the cosmological viability of f(R) dark energy models
• Evading Equivalence Principle Violations, Cosmological and other Experimental Constraints in Scalar Field Theories with a Strong Coupling to Matter
• The Cosmology of f(R) Gravity in the Metric Variational Approach
• The holographic dark energy in non-flat Brans-Dicke cosmology
• Phantom scalar dark energy as modified gravity: understanding the origin of the Big Rip singularity
• de Sitter space and the equivalence between f(R) and scalar-tensor gravity
• The evolution of density perturbations in f(R) gravity
• Dark energy from modified F(R)-scalar-Gauss-Bonnet gravity
• Mapping the Cosmological Expansion
• Viability of f(R) Theories with Additional Powers of Curvature
• The phase space view of f(R) gravity
• Holographic dark energy in Brans-Dicke cosmology with chameleon scalar field
• Viable Palatini-f(R) cosmologies with generalized dark matter
• The Effect of a Chameleon Scalar Field on the Cosmic Microwave Background
• Stellar configurations in f(R) theories of gravity
• Modified gravity with $f(R)=\sqrt{R^2-R_0^2}$
• Statefinder diagnostic for the modified polytropic Cardassian universe
• Stability Analysis in Tachyonic Potential Chameleon cosmology
• Revisiting chameleon gravity - thin-shells and no-shells with appropriate boundary conditions
• Attractors, Statefinders and Observational Measurement for Chameleonic Brans--Dicke Cosmology
• Non-minimal Maxwell-Modified Gauss-Bonnet Cosmologies: Inflation and Dark Energy
• Cosmic acceleration and crossing of $\omega =-1$ in non-minimal modified Gauss-Bonnet gravity
• Gauss-Bonnet Chameleon Mechanism of Dark Energy
• A new approach in stability analysis: case study: tachyon cosmology with non-minimally coupled scalar field-matter
• Early and Late Transient Cosmic Acceleration due to Curvature Inspired Dark Energy
• Bouncing Universe and phantom crossing in Modified Gravity and its reconstruction
• An Inverse $f(R)$ Gravitation for Cosmic Speed up, and Dark Energy Equivalent
• Entropy and statefinder diagnosis in chameleon cosmology
• Stability analysis in Modified Non-Local Gravity
• Scaling attractors for quintessence in flat universe with cosmological term

Cited by in corpus (3)

• Interacting Agegraphic Dark Energy Model in DGP Braneworld Cosmology: Dynamical System Approach
• Dynamical System Analysis of Brane Induced Gravity with Tachyon Field
• Varying alpha and cosmic acceleration in Brans-Dicke-BSBM theory: stability analysis and observational tests