DDELenS: Tomographic Weak Lensing Simulations with Dynamical Dark Energy

We present a suite of 128 cosmological simulations in $w_0{w}_a$CDM cosmologies with massive neutrinos, designed to enable simulation-based inference of dynamical dark energy parameters from weak gravitational lensing and other cosmological observables. Each simulation follows ${1024}^3$ dark matter particles in a $512h^{-1}$Mpc periodic box, with cosmological parameters sampled using a Sobol sequence over the ranges ${\mathrm{\Omega }}_m\in [0.28,0.35]$, ${\sigma }_8\in [0.74,0.90]$, $w_0\in [-1.0,-0.5]$, and $w_a\in [-1.5,0.0]$, motivated by recent results from the Dark Energy Spectroscopic Instrument survey. The nonlinear evolution is computed with $\mathtt{\text{PKDGRAV3}}$ using the N-body gauge to consistently incorporate relativistic corrections from massive neutrinos, photons, and dark energy. For each cosmology, we generate 10,000 ray-traced convergence maps at six source redshifts $z_s\in \{0.5,1.0,1.5,2.0,2.5,1100\}$ using $\mathtt{\text{LensTools}}$, and additionally provide halo catalogues and projected halo overdensity fields for galaxy–lensing cross-correlation analyses. We generate 100,000 realizations at the fiducial cosmology for the construction of the covariance matrix. This simulation suite provides a foundation for field-level inference and non-Gaussian statistics with next-generation weak lensing surveys such as the Rubin Observatory LSST, Euclid, and the Nancy Grace Roman Space Telescope, as well as CMB lensing experiments including the Simons Observatory.