New Perspectives on Axion Misalignment Mechanism

Abstract

A zero initial velocity of the axion field is assumed in the conventional misalignment mechanism. We propose an alternative scenario where the initial velocity is nonzero, which may arise from an explicit breaking of the PQ symmetry in the early Universe. We demonstrate that, depending on the specifics about the initial velocity and the time order of the PQ symmetry breaking vs. inflation, this new scenario can alter the conventional prediction for the axion relic abundance in different, potentially significant ways. As a result, new viable parameter regions for axion dark matter may open up.

7 pages, 7 figures; UPDATE to a published version

References in corpus (23)

• Axion Cosmology
• The QCD axion, precisely
• New experimental approaches in the search for axion-like particles
• The origin of the matter-antimatter asymmetry
• Cosmological Relaxation of the Electroweak Scale
• Axion dark matter from topological defects
• Cosmological implications of ultra-light axion-like fields
• Axions from Strings: the Attractive Solution
• Quintessence and the Relic Density of Neutralinos
• Early-Universe Simulations of the Cosmological Axion
• Dark Matter Axions Revisited
• The topological susceptibility in finite temperature QCD and axion cosmology
• Topological Susceptibility and QCD Axion Mass: QED and NNLO corrections
• The scaling density of axion strings
• Long-term dynamics of cosmological axion strings
• Chiral observables and topology in hot QCD with two families of quarks
• Stochastic Gravitational Wave Background from Global Cosmic Strings
• Topology in full QCD at high temperature: a multicanonical approach
• How to simulate global cosmic strings with large string tension
• Inflationary Cosmology Connecting Dark Energy and Dark Matter
• Scaling properties of cosmological axion strings
• Axion Inflation and Affleck-Dine Baryogenesis
• Affleck-Dine baryogenesis in the SUSY Dine-Fischler-Srednicki-Zhitnitsky axion model without R-parity

Cited by in corpus (33)

• More Axions from Strings
• Unifying of Inflation with Early and Late Dark Energy Epochs in Axion $F(R)$ Gravity
• Gravitational Waves from Global Cosmic Strings and Cosmic Archaeology
• Axion Kinetic Misalignment and Parametric Resonance from Inflation
• Axion dark matter from first-order phase transition, and very high energy photons from GRB 221009A
• Kinetic Axion $F(R)$ Gravity Inflation
• Friendship in the Axiverse: Late-time direct and astrophysical signatures of early-time nonlinear axion dynamics
• Recurrent Axinovae and their Cosmological Constraints
• Audible Axions with a Booster: Stochastic Gravitational Waves from Rotating ALPs
• Chiral models of composite axions and accidental Peccei-Quinn symmetry
• ALP Dark Matter Mini-Clusters from Kinetic Fragmentation
• Josephson junction-based axion detection through resonant activation
• ALP dark matter with non-periodic potentials: parametric resonance, halo formation and gravitational signatures
• Kick it like DESI: PNGB quintessence with a dynamically generated initial velocity
• Dark Matter Axions in the Early Universe with a Period of Increasing Temperature
• Effective Field Theory for Dark Matter Absorption on Single Phonons
• QCD Axion Kinetic Misalignment without Prejudice
• Axion dark matter from frictional misalignment
• Enhanced Early Galaxy Formation in JWST from Axion Dark Matter?
• Absorption of Axion Dark Matter in a Magnetized Medium
• Revisiting signatures of thermal axions in nonstandard cosmologies
• MiMeS: Misalignment Mechanism Solver
• Imprint of Early Dark Energy in Stochastic Gravitational Wave Background
• A universal bound on the duration of a kination era
• New Source for QCD Axion Dark Matter Production: Curvature Induced
• ALP Dark Matter from Kinetic Fragmentation: Opening up the Parameter Window
• How light can ALP dark matter be?
• Supercooled Audible Axions
• Kination cosmology from scalar fields and gravitational-wave signatures
• Axion Free-kick Misalignment Mechanism
• Field mixing in a thermal medium: A quantum master equation approach
• The Search for the Cosmological Axion -- A New Refined Narrow Mass Window and Detection Scheme
• Axion Fragmentation on the Lattice