Minimal solution to the axion isocurvature problem from a nonminimal coupling
arXiv:2404.06441 · doi:10.1103/PhysRevD.110.095008
Abstract
The main limitation for preinflationary breaking of Peccei-Quinn (PQ) symmetry is the upper bound on the Hubble rate during inflation from axion isocurvature fluctuations. This leads to a tension between high scale inflation and QCD axions with grand unified theory (GUT) scale decay constants, which reduces the potential for a detection of tensor modes at next generation cosmic microwave background (CMB) experiments. We propose a mechanism that explicitly breaks PQ symmetry via nonminimal coupling to gravity, that lifts the axion mass above the Hubble scale during inflation and has negligible impact on today's axion potential. The initially heavy axion gets trapped at an intermediate minimum during inflation given by the phase of the nonminimal coupling, before it moves to its true -conserving minimum after inflation. During this stage it undergoes coherent oscillations around an adiabatically decreasing minimum, which slightly dilutes the axion energy density, while still being able to explain the observed dark matter relic abundance. This scenario can be tested by the combination of next generation CMB surveys like CMB-S4 and LiteBIRD with haloscopes such as ABRACADABRA, DMRadio or CASPEr-Electric.
v1: 5 pages, 2 figures + 1 appendix, 2 figures, Comments are always welcome! v2: references added, estimates about relic abundance from fluctuations added, conclusions unchanged. v3: 7 pages, 2 figures; layout optimized, typos corrected, matches published version + one additional comment
References in corpus (82)
- Planck 2018 results. X. Constraints on inflation
- String Axiverse
- Axions In String Theory
- Generating the curvature perturbation without an inflaton
- BICEP / Keck XIII: Improved Constraints on Primordial Gravitational Waves using Planck, WMAP, and BICEP/Keck Observations through the 2018 Observing Season
- WISPy Cold Dark Matter
- Adiabatic CMB perturbations in pre-big bang string cosmology
- Effects of Cosmological Moduli Fields on Cosmic Microwave Background
- The QCD axion, precisely
- The landscape of QCD axion models
- Quasi-Single Field Inflation and Non-Gaussianities
- Mission design of LiteBIRD
- The pressure of hot QCD up to g^6 ln(1/g)
- Dimensionless constants, cosmology and other dark matters
- New Observables for Direct Detection of Axion Dark Matter
- Broadband and Resonant Approaches to Axion Dark Matter Detection
- Cosmic Axion Spin Precession Experiment (CASPEr)
- Comment on Higgs Inflation and Naturalness
- Axion Cosmology Revisited
- On Inflation with Non-minimal Coupling
- Axion Cosmology and the Energy Scale of Inflation
- Constraining the mass of dark photons and axion-like particles through black-hole superradiance
- Gravitational Baryogenesis
- Improved axion emissivity from a supernova via nucleon-nucleon bremsstrahlung
- Preheating with Trilinear Interactions: Tachyonic Resonance
- Axion Kinetic Misalignment Mechanism
- Instability of anisotropic cosmological solutions supported by vector fields
- Dark Matter Axions Revisited
- Standard Model-Axion-Seesaw-Higgs Portal Inflation. Five problems of particle physics and cosmology solved in one stroke
- The importance of being warm (during inflation)
- Ghost instabilities of cosmological models with vector fields nonminimally coupled to the curvature
- Higgs Inflation and Naturalness
- Fast-Roll Inflation
- Spacetime curvature and Higgs stability after inflation
- Topological Susceptibility and QCD Axion Mass: QED and NNLO corrections
- Probing axions with the neutrino signal from the next galactic supernova
- On the reheating stage after inflation
- Cosmology of axion dark matter
- Projected Sensitivity of DMRadio-m: A Search for the QCD Axion Below eV
- Isocurvature constraints on gravitationally produced superheavy dark matter
- Gravitational Wave and CMB Probes of Axion Kination
- Misalignment & Co.: (Pseudo-)scalar and vector dark matter with curvature couplings
- Vector Coherent Oscillation Dark Matter
- Axion Cosmology with Early Matter Domination
- Isocurvature Constraints and Anharmonic Effects on QCD Axion Dark Matter
- Gravitational production of super-Hubble-mass particles: an analytic approach
- Solving the Tension between High-Scale Inflation and Axion Isocurvature Perturbations
- Introducing DMRadio-GUT, a search for GUT-scale QCD axions
- Dark matter from gravitational particle production at reheating
- Unifying inflation and dark matter with the Peccei-Quinn field: observable axions and observable tensors
- Isocurvature forecast in the anthropic axion window
- Suppressing Isocurvature Perturbations of QCD Axion Dark Matter
- Lightish but clumpy: scalar dark matter from inflationary fluctuations
- Gravitational Production of Superheavy Dark Matter and Associated Cosmological Signatures
- Axion Isocurvature and Magnetic Monopoles
- Dynamics of Peccei-Quinn Breaking Field after Inflation and Axion Isocurvature Perturbations
- Chemical-Potential-Assisted Particle Production in FRW Spacetimes
- Axion Dark Matter and Planck favor non-minimal couplings to gravity
- Strongly broken Peccei-Quinn symmetry in the early Universe
- Increasing Temperature toward the Completion of Reheating
- Quintessential Affleck-Dine baryogenesis with non-minimal couplings
- On the health of a vector field with (R A^2)/6 coupling to gravity
- String theoretic QCD axions in the light of PLANCK and BICEP2
- The meso-inflationary QCD axion
- Adiabatic suppression of the axion abundance and isocurvature due to coupling to hidden monopoles
- Higgs inflation and suppression of axion isocurvature perturbation
- Minimal self-interacting dark matter models with light mediator
- High-Scale Axions without Isocurvature from Inflationary Dynamics
- Axion Inflation, Proton Decay and Leptogenesis in
- Axion Dark Matter with High-Scale Inflation
- Cosmological effects of Peccei-Quinn symmetry breaking on QCD axion dark matter
- Trapping Effect for QCD Axion Dark Matter
- Dark Matter Axions in the Early Universe with a Period of Increasing Temperature
- A Brief History of Curvature
- Dynamical axion misalignment with small instantons
- Axion Quality Problem Alleviated by Non-Minimal Coupling to Gravity
- Inflation connected to the origin of violation
- Opening up a window on the postinflationary QCD axion
- Revisiting isocurvature bounds in models unifying the axion with the inflaton
- Relaxation leptogenesis, isocurvature perturbations, and the cosmic infrared background
- Removing the Cosmological Bound on the Axion Scale in the KSVZ and DFSZ Models
- Ultraviolet Sensitivity of Peccei-Quinn Inflation