Simulation data for 2606.31571

This dataset contains results from three-dimensional numerical simulations of a first-order cosmological phase transition and the accompanying gravitational wave (GW) production from bubble collisions. The simulations are performed on a periodic cubic grid of physical size L=40 * vw / \beta using a relativistic fluid evolved with a fourth-order Runge–Kutta scheme. Parameter scan. The dataset spans the following parameter grid: Grid resolution N: 128, 256, 512 Phase transition strength α: 0.005, 0.05 Inverse duration parameter β/H: 15, 20, 25 Bubble wall velocity v_w: 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 Expansion scenarios. For each parameter combination, two runs are provided: Files without the ne_ prefix include the effect of cosmological expansion. Files with the ne_ prefix omit expansion (non-expansion). File format and contents. All data are stored in HDF5 (.h5) format. The file naming convention is [ne_]N_{N}_L_40_alpha_{alpha}_beta_{beta}_vw_{vw}.h5 Each file contains the following datasets: Dataset Description t Conformal time array, shape (Nt,)(Nt,) GWs Gravitational wave power spectrum Ω_GW(q,t), shape (Nt,80)(Nt,80), binned in 80 wavenumber bins Ufsq Mean squared fluid four-velocity ⟨Uf⟩^2(t), shape (Nt,)(Nt,) bti Bubble nucleation times for the full nucleation history, shape (Nbub,)(Nbub,) percolation_time Percolation time