Suite of hydrodynamical simulations for the Lyman-α forest with massive neutrinos

摘要: The signature left in quasar spectra by neutral hydrogen the Universe allows constraining sum of neutrino masses with a better sensitivity than laboratory experiments and may shed new light on mass hierarchy absolute mass-scale neutrinos. Constraints cosmological parameters dark energy equation state can also be derived from joint parameter estimation procedure. However, this requires detailed modeling line-of-sight power spectrum transmitted flux Lyman-α (Lyα) forest scales ranging few to hundreds megaparsecs, which turn demands inclusion careful treatment To end, we present here suite state-of-the-art hydrodynamical simulations cold matter (CDM), baryons massive neutrinos, specifically targeted for low-density regions intergalactic medium (IGM) as probed Lyα at high-redshift. span volumes (25 h-1 Mpc)3 (100 Mpc)3, were made using either 3 × 1923 ≃ 21 million or 7683 1.4 billion particles. resolution various runs was further enhanced, so that reached equivalent 30723 87 particles box size. chosen are compatible latest Planck 2013 results, although explored effect slight variations main astrophysical parameters. We adopted particle-type implementation consider three degenerate species ∑ mν = 0.1,0.2,0.3,0.4, 0.8 eV, respectively. improved previous studies several ways, particular updated routines IGM radiative cooling heating processes, initial conditions based second-order Lagrangian perturbation theory (2LPT) rather Zel’dovich approximation. This allowed us safely start our relatively low redshift (z 30), reduced shot-noise contamination component CPU consumption. In addition providing technical details simulations, first analysis nonlinear three- one-dimensional these models, characterize statistics including synergy recent data Baryon Acoustic Spectroscopic Survey (BOSS) satellite, grid corresponding neutrino-less realizations will allow constrain directly sensitivity. addition, useful broader variety applications, three-dimensional cross-correlations between different probes, studying expansion history particle-physics related topics. Moreover, while have been designed meet requirements BOSS survey, they used upcoming future – such eBOSS DESI.