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Gravitational wave and dark matter from Axion-Higgs string
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abstract
Axions have long been considered plausible candidates for dark matter. The axion dark matter emitted from cosmic strings after the Peccei-Quinn (PQ) symmetry breaking in the early Universe was extensively simulated. In this work, we study dark matter and gravitational waves through the lattice simulation of the Axion-Higgs string. We gave the dark matter overproduction and the Big Bang nucleosynthesis bounds on the axion decay constant $f_a$ and the axion mass $m_a$ for axion-like particles, and found that the predicted gravitational wave spectra cannot be probed by the dataset of the current pulsar timing array experiments.
Forward citations
Cited by 3 Pith papers
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One-Dimensional Simulations of the Topological Defects in a 3:1 $U(1)$ Model
In a 3:1 U(1) model, the Z3 domain wall develops a growing bias angle beta as v1/v2 is lowered, and no static wall exists below R12 ≈ 0.768.
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Testing Nambu-Goto approximation of cosmic string by lattice field simulations
For strongly coupled local cosmic strings with m_v/m_s ~ 1, the Nambu-Goto gravitational wave spectrum deviates substantially from lattice field theory, while agreement holds for near-global and weakly coupled strings.
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Gravitational waves and dark matter with Witten effect
A dark SU(2) phase transition can produce monopole dark matter, make the axion heavy via the Witten effect, and generate nanohertz gravitational waves matching PTA hints.
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