Heavy QCD axion model in light of pulsar timing arrays

Abstract

Recently, pulsar timing array experiments reported the observation of a stochastic gravitational wave background in the nanohertz range frequency band. We show that such a signal can be originated from a cosmological first-order phase transition (PT) within a well-motivated heavy (visible) QCD axion model. Considering the Peccei-Quinn symmetry breaking at the TeV scale in the scenario, we find a supercooled PT, in the parameter space of the model, prolonging the PT with the reheating temperature at the GeV scale.

v2: 8 pages, 4 figures, new discussions and references added

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Cited by in corpus (13)

• Bounds on Ultralight Dark Matter from NANOGrav
• Enhancement of gravitational waves at Q-ball decay including non-linear density perturbations
• Null energy condition violation during inflation and pulsar timing array observations
• Constraints on holographic QCD phase transitions from PTA observations
• Beyond the Hellings-Downs curve: Non-Einsteinian gravitational waves in pulsar timing array correlations
• Correlations for an anisotropic polarized stochastic gravitational wave background in pulsar timing arrays
• Stochastic gravitational wave background: birth from string-wall death
• General bubble expansion at strong coupling
• Non-Invertible Peccei-Quinn Symmetry, Natural 2HDM Alignment, and the Visible Axion
• Constraining CPT-odd electromagnetic chiral parameters with pulsar timing
• Search for the non-linearities of gravitational wave background in NANOGrav 15-year data set
• Bubbles kick off primordial black holes to form more binaries
• Primordial Black Holes from Spatially Varying Cosmological Constant Induced by Field Fluctuations in Extra Dimensions