Papers › Domain Wall Network: A Dual Solution for Gravitational Waves and Hubble Tension?
Domain Wall Network: A Dual Solution for Gravitational Waves and Hubble Tension?
Ligong Bian, Shuailiang Ge, Changhong Li, Jing Shu, Junchao Zong
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We explore the possibility that domain wall networks generate the stochastic gravitational wave background (SGWB) observed as a strong common power-law process in the Data Release-2 of Parkes Pulsar Timing Array. We find that a broad range of parameters, specifically wall tension around σ_(DW) ∼(29-414 , TeV)³ and wall-decay temperature within T_d ∼20-257 , MeV, can explain this phenomenon at a 68% credible level. Meanwhile, the same parameters could ease the Hubble tension if particles from these domain wall networks decay into dark radiation. We establish a direct analytical relationship, Ω_(GW)(fₚ,T₀) h² ∼Ω_(rad) h² ( Ω_ν ΔN_(eff))², to illustrate this coincidence, underlining its importance in the underlying physics and potential applicability to a wider range of models and data. Conversely, if the common power-law process is not attributed to domain wall networks, our findings impose tight limits on the wall tension and decay temperature.
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