Accelerating anisotropic cosmologies in Brans-Dicke gravity coupled to a mass-varying vector field

Abstract

The field equations of Brans-Dicke gravity coupled to a mass-varying vector field are derived. Anisotropic cosmological solutions with a locally rotationally symmetric Bianchi type I metric and time-dependent scalar and electric vector fields are studied. A particular class of exact solutions for which all the variable parameters have a power-law time dependence is given. The universe expands with a constant expansion anisotropy within this class of solutions. We show that the accelerating expansion is driven by the scalar field and the electric vector field can be interpreted as an anisotropic dark matter source.

15 pages, no figures and tables; matches the version published in Classical and Quantum Gravity

References in corpus (15)

• Dynamics of dark energy
• Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests
• Planck 2018 results. VII. Isotropy and Statistics of the CMB
• Inflationary Universe with Anisotropic Hair
• Vector Inflation
• Instability of anisotropic cosmological solutions supported by vector fields
• Ellipsoidal Universe Can Solve The CMB Quadrupole Problem
• Anisotropic Power-law Inflation
• Anisotropic Cosmological Constant and the CMB Quadrupole Anomaly
• Anisotropic Inflation from Vector Impurity
• Constraining Dark Energy Anisotropic Stress
• de Sitter expansion with anisotropic fluid in Bianchi type-I space-time
• Probing Dark Energy Anisotropy
• Anisotropy of Cosmic Acceleration
• Anisotropic dark energy and ellipsoidal universe

Cited by in corpus (15)

• Constraints on a Bianchi type I spacetime extension of the standard $\Lambda$CDM model
• Phantom fluid supporting traversable wormholes in alternative gravity with extra material terms
• Testing spatial curvature and anisotropic expansion on top of the $\Lambda$CDM model
• Cosmology for quadratic gravity in generalized Weyl geometry
• Falsifying cosmological models based on a non-linear electrodynamics
• Screening anisotropy via energy-momentum squared gravity: $\Lambda$CDM model with hidden anisotropy
• Anisotropic massive Brans-Dicke gravity extension of the standard $\Lambda$CDM model
• A late time accelerated FRW model with scalar and vector fields via Noether symmetry
• Disformal vectors and anisotropies on a warped brane
• Anisotropic inflation with a non-minimally coupled electromagnetic field to gravity
• Anisotropic universe with anisotropic dark energy
• Doubly-boosted vector cosmologies from disformal metrics
• Late-Time Anisotropy Sourced by a 2-Form Field Non-Minimally Coupled to Cold Dark Matter
• Accelerated expansion of the Universe a la the Stueckelberg mechanism
• Embedding the stationary spacetimes into Brans-Dicke cosmology via conformal transformations