2026/07/27 by Jorge Baeza-Ballesteros, Daniel G. Figueroa, Adrien Florio +4
#astro-ph.CO #hep-ph
This paper introduces \tt \mathcal Cosmo\mathcal Lattice \tt v2.0, a major upgrade that substantially broadens the physical scope and computational capabilities of the code. It introduces lattice implementations of scalar fields non-minimally coupled to gravity through ϕ2R, as well as axion-like fields coupled to Abelian gauge sectors as ϕFμν\widetilde Fμν. It also provides new procedures for generating specialized initial conditions, including scaling networks of cosmic defects (\it e.g. strings and domain walls), and fields with arbitrary power spectra. The release also incorporates low-storage Runge-Kutta integrators for non-symplectic systems (suitable \it e.g. for non-minimal scalar kinetic terms as Gab∂μϕa∂μϕb), scalar-field simulations on reduced (1+1)- and (2+1)-dimensional lattices, new optimized gravitational-wave evolution, more flexible field and energy-density outputs, and GPU support that can accelerate simulations by a factor O(10) relative to CPU execution. Extensive documentation on the use of the code is provided on https://www.cosmolattice.com