Neutrino mass and dark energy constraints from redshift-space distortions

Journal Article · 24 May 2019 · Journal of Cosmology and Astroparticle Physics

DOI: https://doi.org/10.1088/1475-7516/2019/05/041 · OSTI ID:1610285

Upadhye, Amol ^[1]

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1. Univ. of Wisconsin, Madison, WI (United States); Univ. of New South Wales, Sydney, NSW (Australia)

Cosmology in the near future promises a measurement of the sum of neutrino masses Σ m_ν, a fundamental Standard Model parameter, as well as substantially-improved constraints on the dark energy. We use the shape of the BOSS redshift-space galaxy power spectrum, in combination with CMB and supernova data, to constrain the neutrino masses and the dark energy. Essential to this calculation are several recent advances in non-linear cosmological perturbation theory, including fast Fourier transform methods, redshift space distortions, and scale-dependent growth. Our 95% confidence upper bound Σ m_ν < 180 meV degrades substantially to Σ m_ν < 540 meV when the dark energy equation of state and its first derivative are also allowed to vary, representing a significant challenge to current constraints. We also study the impact of additional galaxy bias parameters, finding that a greater allowed range of scale-dependent bias only slightly shifts the preferred Σ m_ν, weakens its upper bound by ≈ 20%, and has a negligible effect on the other cosmological parameters.

• Research Organization: Univ. of Wisconsin, Madison, WI (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• Grant/Contract Number: FG02-95ER40896
• OSTI ID: 1610285
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2019, Issue 05; ISSN 1475-7516
• Publisher: Institute of Physics (IOP)Copyright Statement
• Country of Publication: United States
• Language: English