Warm dark energy

Abstract

Motivated by some of the recent swampland conjectures, we study the implementation for the late time acceleration of the Universe of a mechanism developed by Anber and Sorbo in the context of primordial inflation, in which an axion field can slowly roll in a steep potential due to additional friction provided by its coupling to some U(1) gauge field. We first study the realization of this mechanism in N = 2 supergravity models resulting from string compactifications on Calabi--Yau manifolds. We then study the transition between matter domination and the axion domination, and show that indeed the backreaction of the produced gauge field can sufficiently slow the motion of the axion, so to produce the present accelerated era. We finally study the transition from a pre-inflationary matter or radiation domination to primordial inflation. In the regime that we could explore numerically, the evolution is characterized by stages of faster axion roll (and consequent bursts of gauge field amplification) intermitted by stages of slower roll, with a pattern that "oscillates'' about the steady state Anber and Sorbo solution, but that does not appear to relax to it.

arXiv comment35 pages

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Cited by in corpus (23)

• Inflation and Primordial Black Holes
• Lattice Simulations of Axion-U(1) Inflation
• Dark Energy Radiation
• The warm inflation story
• Instability in axion inflation with strong backreaction from gauge modes
• Axion inflation in the strong-backreaction regime: decay of the Anber-Sorbo solution
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• Lattice simulations of Abelian gauge fields coupled to axions during Inflation
• Parity violating gravitational waves at the end of inflation
• Double Monodromy Inflation: A Gravity Waves Factory for CMB-S4, LiteBIRD and LISA
• Backreaction of axion-SU(2) dynamics during inflation
• Axion assisted Schwinger effect
• Unveiling the nonlinear dynamics of a rolling axion during inflation
• The non-linear dynamics of axion inflation: a detailed lattice study
• Axion dark matter from frictional misalignment
• On Sphaleron Heating in the Presence of Fermions
• Magnetogenesis from axion-SU(2) inflation
• Strong backreaction of gauge quanta produced during inflation
• Hitchhiker's Guide to the Swampland: The Cosmologist's Handbook to the string-theoretical Swampland Programme
• Gravitational Waves from a Gauge Field Non-minimally Coupled to Gravity
• On the F-term problem and quintessence supersymmetry breaking
• Perturbative limits on axion-SU(2) gauge dynamics during inflation from the energy density of spin-2 particles
• Very-High-Frequency Gravitational Waves from Multi-Monodromy Inflation