Is the axionic dark matter an equilibrium system?

Abstract

We consider an axionic dark matter model with a modified periodic potential for the pseudoscalar field in the framework of the axionic extension of the Einstein-aether theory. The modified potential is assumed to be equipped by the guiding function, which depends on the expansion scalar constructed as the trace of the covariant derivative of the aether velocity four-vector. The equilibrium state of the axion field is defined as the state, for which the modified potential itself and its first derivative with respect to the pseudoscalar field are equal to zero. We apply the developed formalism to the homogeneous isotropic cosmological model, and find the basic function, which describes the equilibrium state of the axionic dark matter in the expanding Universe.

arXiv commentBased on the talk presented on the 17th Russian Conference on Gravitation, Cosmology and Astrophysics (RUSGRAV-17)

References in corpus (18)

• Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
• Modified Gravity Theories on a Nutshell: Inflation, Bounce and Late-time Evolution
• Axion Cosmology
• Gravity with a dynamical preferred frame
• Bose-Einstein Condensation of Dark Matter Axions
• Einstein-Aether Waves
• Axions as Dark Matter Particles
• Dark Matter Candidates - Axions, Neutralinos, Gravitinos, and Axinos
• Unification of Inflation with Dark Energy in $f(R)$ Gravity and Axion Dark Matter
• Non-Baryonic Dark Matter in Cosmology
• Einstein-aether theory, violation of Lorentz invariance, and metric-affine gravity
• Einstein-aether gravity: a status report
• $F(R)$ Gravity with an Axion-like Particle: Dynamics, Gravity Waves, Late and Early-time Phenomenology
• Variations on an aethereal theme
• Axionic extension of the Einstein-aether theory
• Polarization and stratification of axionically active plasma in a dyon magnetosphere
• New application of the Killing vector field formalism: Modified periodic potential and two-level profiles of the axionic dark matter distribution
• Fingerprints of the cosmological constant: Folds in the profiles of the axionic dark matter distribution in a dyon exterior

Cited by in corpus (11)

• Brief Review of Recent Advances in Understanding Dark Matter and Dark Energy
• Time-averaging axion-like interacting scalar fields models
• Averaging Generalized Scalar Field Cosmologies I: Locally Rotationally Symmetric Bianchi III and open Friedmann-Lemaître-Robertson-Walker models
• Averaging Generalized Scalar Field Cosmologies II: Locally Rotationally Symmetric Bianchi I and flat Friedmann-Lemaître-Robertson-Walker models
• Towards nonlinear axion-dilaton electrodynamics: How can axionic dark matter mimic dilaton-photon interactions?
• Interaction of the axionic dark matter, dynamic aether, spinor and gravity fields as an origin of oscillations of the fermion effective mass
• Einstein-Yang-Mills-aether theory with nonlinear axion field: Decay of color aether and the axionic dark matter production
• The Holographic cosmology with axion field
• Isotropic cosmological model with aetherically active axionic dark matter
• Holographic description of the dissipative unified dark fluid model with axion field
• Interaction of the Cosmic Dark Fluid with Dynamic Aether: Parametric Mechanism of Axion Generation in the Early Universe