Roman Space Telescope to Constrain Neutrino Mass

This research presents forecasts for the Nancy Grace Roman Space Telescope's ability to constrain fundamental cosmological parameters, with a particular focus on the absolute neutrino mass scale. The analysis utilizes simulated lightcone mock catalogs of Hα emission-line galaxies spanning a redshift range of 0.5 < z < 2 over 2400 deg². Parameter inference is performed on the galaxy power spectrum multipoles using both a model-dependent approach based on the Effective Field Theory of Large-Scale Structure (EFT of LSS) within ΛCDM and a model-independent phenomenological approach. The forecasts indicate that Roman can constrain the neutrino mass to mν < 0.380(0.162) eV at 95(68)% C.L. using a Big Bang Nucleosynthesis (BBN) prior. Additionally, Roman is expected to constrain H0, Ωm, and σ8 with precisions of 1.3%, 4.3%, and 2.9%, respectively. The study highlights the potential of the Roman Space Telescope to provide valuable insights into the nature of dark matter and dark energy, contributing to a more comprehensive understanding of the universe's composition and evolution. The reliance on simulations and theoretical frameworks introduces potential uncertainties that must be carefully considered when interpreting the results.

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