Particle creation and decay in nonminimally coupled models of gravity

Abstract

In extended models of gravity a nonminimal coupling to matter has been assumed to lead to irreversible particle creation. In this paper we challenge this assumption. We argue that a non-minimal coupling of the matter and gravitational sectors results in a change in particle-momentum on a cosmological timescale, irrespective of particle creation or decay. We further argue that particle creation or decay associated with a non-minimal coupling to gravity could only happen as a result of significant deviations from a homogeneous Friedmann-Robertson-Walker geometry on microscopic scales, and provide a phenomenological description of the impact of particle creation or decay on the cosmological evolution of the density of the matter fields.

arXiv comment5 pages, resubmited to more closely resemble published version

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Cited by in corpus (8)

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• To conserve, or not to conserve: A review of nonconservative theories of gravity
• Emergent Universe from Energy-Momentum Squared Gravity
• Lagrangian description of cosmic fluids: mapping dark energy into unified dark energy
• Distance-duality in theories with a nonminimal coupling to gravity
• Boltzmann's $H$-theorem, entropy and the strength of gravity in theories with a nonminimal coupling between matter and geometry
• On Scalar Cosmological Perturbations in Non-Minimally Coupled Weyl Connection Gravity
• Lagrangian Identity and Mass Evolution of Particle-like Objects in Nonminimally Coupled Gravity