Phase Structure and Gravitational-Wave Phenomenology of a Thermal First-Order Phase Transition

Abstract

We investigate the phase structure and gravitational-wave (GW) phenomenology of a cosmological first-order phase transition described by the finite-temperature effective potential $V(ϕ,T)=D(T^2-T_0^2)ϕ^2-ETϕ^3+λϕ^4/4$. We derive the critical temperature and the broken-phase order parameter and identify the dimensionless combination $E^2/(Dλ)$ that controls the critical-temperature shift. We then construct a dense numerical atlas containing $30\,000$ parameter points and map the resulting transition parameters onto the characteristic GW frequency and peak amplitude. The scan resolves the multidimensional correlations among $T_*$, $α$, $β/H_*$, $v_w$, $f_{\rm peak}$ and $Ω_{\rm GW}^{\rm peak}h^2$. The present analysis is phenomenological: $T_*$ is defined by the prescription $T_*=0.95T_c$, while $β/H_*$ and $v_w$ are treated as scan inputs. Consequently, the resulting GW signals are not interpreted as first-principles predictions. We identify the additional ingredients required for a predictive calculation, including the thermal bounce action, nucleation and percolation temperatures, the transition duration and a microscopic treatment of bubble-wall friction. The resulting framework provides a systematic numerical characterization of the connection between the phase structure of the finite-temperature potential and the corresponding phenomenological GW parameter space.