Cosmic Acceleration in an Extended Brans-Dicke-Higgs Theory

Abstract

We consider an extended scalar-tensor theory of gravity where the action has two interacting scalar fields, a Brans-Dicke field which makes the effective Newtonian constant a function of coordinates and a Higgs field which has derivative and non-derivative interaction with the lagrangian. There is a non-trivial interaction between the two scalar fields which dictates the dominance of different scalar fields in different era. We investigate if this setup can describe a late-time cosmic acceleration preceded by a smooth transition from deceleration in recent past. From a cosmological reconstruction technique we find the scalar profiles as a function of redshift. We find the constraints on the model parameters from a Markov Chain Monte Carlo analysis using observational data. Evolution of an effective equation of state, matter density contrast and thermodynamic equilibrium of the universe are studied and their significance in comparison with a LCDM cosmology is discussed.

15 Pages, 12 Figures, To Appear in MNRAS

References in corpus (18)

• Dynamics of dark energy
• The Standard Model Higgs boson as the inflaton
• Baryon Acoustic Oscillations in the Lyα forest of BOSS DR11 quasars
• Evading Equivalence Principle Violations, Cosmological and other Experimental Constraints in Scalar Field Theories with a Strong Coupling to Matter
• Gaussian Process Cosmography
• Nonparametric Dark Energy Reconstruction from Supernova Data
• Strongly Coupled Chameleon Fields: New Horizons in Scalar Field Theory
• The Hubble series: Convergence properties and redshift variables
• Brans-Dicke Scalar Field as a Chameleon
• The $\bar{\Lambda }CDM$ cosmology: from inflation to dark energy through running $\Lambda$
• The generalized second law of thermodynamics in Horava-Lifshitz cosmology
• A Field Theory Model for Dark Matter and Dark Energy in Interaction
• Cosmic Jerk, Snap and Beyond
• Decaying Gravity
• In search of the dark matter dark energy interaction: a kinematic approach
• Two-scalar-field model for the interaction of dark energy and dark matter
• Geometrical Constraints on Dark Energy
• Search for Higgs shifts in white dwarfs

Cited by in corpus (2)

• Cosmic Variation of Proton to Electron Mass Ratio with an interacting Higgs Scalar Field
• On Generalized Theories of Varying Fine Structure Constant