Gravitational waves from supercool axions
TLDR
In this article, the Peccei-Quinn (PQ) phase transition for the QCD axion is studied and a frequency peak in the range 100-1000 Hz with an amplitude that is already within the sensitivity of LIGO is predicted.Abstract:
We study the dynamics of the Peccei-Quinn (PQ) phase transition for the QCD axion. In weakly coupled models the transition is typically second order except in the region of parameters where the PQ symmetry is broken through the Coleman-Weinberg mechanism. In strongly coupled realizations the transition is often first order. We show examples where the phase transition leads to strong supercooling lowering the nucleation temperature and enhancing the stochastic gravitational wave signals. The models predict a frequency peak in the range 100–1000 Hz with an amplitude that is already within the sensitivity of LIGO and can be thoroughly tested with future gravitational wave interferometers.read more
Citations
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Journal ArticleDOI
The landscape of QCD axion models
TL;DR: The landscape of QCD axion models is reviewed in this paper, where theoretical constructions that extend the window for the axion mass and couplings beyond conventional regions are highlighted and classified Bounds from cosmology, astrophysics and experimental searches are reexamined and updated
Journal ArticleDOI
New sensitivity curves for gravitational-wave signals from cosmological phase transitions
TL;DR: In this paper, peak-integrated sensitivity curves (PISC) are constructed for a cosmological first-order phase transition (SFOPT) with respect to the expected shape of the signal.
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Gravitational waves from first-order cosmological phase transitions: lifetime of the sound wave source
TL;DR: In this article, the authors survey the general parametrisations of particle-physics models for a first-order phase transition in the early universe, including models with polynomial potentials both with and without barriers at zero temperature, and models with potentials that are classically scale-invariant.
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Beyond the Standard Models with cosmic strings
TL;DR: In this paper, the authors examine which information on the early cosmological history can be extracted from the potential measurement by third-generation gravitational-wave observatories of a stochastic gravitational wave background (SGWB) produced by cosmic strings.
Journal ArticleDOI
Gravitational waves and dark radiation from dark phase transition: Connecting NANOGrav pulsar timing data and hubble tension
TL;DR: In this article, the authors explore a possibility to generate low-frequency gravitational waves from a dark sector phase transition, assuming that the dark sector is completely decoupled from the visible sector except via the gravitational interaction.
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