Scalar particle production in a simple Horndeski theory

Abstract

The scalar particle production through a scalar field non-minimally coupled with geometry is investigated in the context of a spatially homogeneous and isotropic universe. In this paper, in order to study the evolution of particle production over time in the case of analytical solutions, we focus on a simple Horndeski theory. We first suppose that the universe is dominated by a scalar field and derive the energy conservation condition. Then from the thermodynamic point of view, the macroscopic non-conservation of the scalar field energy-momentum tensor can be explained as an irreversible production of the scalar particles. Based on the explanation, we obtain a scalar particle production rate and the corresponding entropy. Finally, since the universe, in general, could be regarded as a closed system satisfying the laws of thermodynamics, we naturally impose some thermodynamic constraints on it. The thermodynamic properties of the universe can provide additional constraints on the simple Horndeski theory.

22 pages, no figure

References in corpus (17)

• The Confrontation between General Relativity and Experiment
• Extra force in $f(R)$ modified theories of gravity
• Test of the Equivalence Principle Using a Rotating Torsion Balance
• Reheating in Inflationary Cosmology: Theory and Applications
• Dark Energy-Dark Matter Interaction and putative violation of the Equivalence Principle from the Abell Cluster A586
• $f(T,\mathcal{T})$ gravity and cosmology
• Generalized curvature-matter couplings in modified gravity
• Thermodynamic interpretation of the generalized gravity models with geometry - matter coupling
• Entropic Accelerating Universe
• The Dynamics of Quintessence, The Quintessence of Dynamics
• Gravitational induced particle production through a nonminimal curvature-matter coupling
• A viability criterion for modified gravity with an extra force
• Galactic rotation curves in modified gravity with non-minimal coupling between matter and geometry
• An Accelerating Cosmology Without Dark Energy
• Entropy evolution of universes with initial and final de Sitter eras
• Phantom behavior via cosmological creation of particles
• Generalized second law of thermodynamics in f(R,T) theory of gravity

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