Neutrino Properties with Groundbased Millimeterwavelength Line Intensity Mapping
Abstract
Line intensity mapping (LIM) is emerging as a powerful technique to map the cosmic largescale structure and to probe cosmology over a wide range of redshifts and spatial scales. We perform Fisher forecasts to determine the optimal design of widefield groundbased millimeterwavelength LIM surveys for constraining properties of neutrinos and light relics. We consider measuring the autopower spectra of several CO rotational lines (from J = 21 to J = 65) and the [C II] finestructure line in the redshift range of 0.25 < z < 12. We study the constraints with and without interloper lines as a source of noise in our analysis, and for several oneparameter and multiparameter extensions of ΛCDM. We show that LIM surveys deployable this decade, in combination with existing cosmic microwave background (CMB; primary) data, could achieve orderofmagnitude improvements over Planck constraints on N _{eff} and M _{ ν }. Compared to nextgeneration CMB and galaxy surveys, a LIM experiment of this scale could achieve bounds that are a factor of ~3 better than those forecasted for surveys such as EUCLID (galaxy clustering), and potentially exceed the constraining power of CMBS4 by a factor of ~1.5 and ~3 for N _{eff} and M _{ ν }, respectively. We show that the forecasted constraints are not substantially affected when enlarging the parameter space, and additionally demonstrate that such a survey could also be used to measure ΛCDM parameters and the dark energy equation of state exquisitely well.
 Publication:

The Astrophysical Journal
 Pub Date:
 February 2022
 DOI:
 10.3847/15384357/ac3edd
 arXiv:
 arXiv:2110.00014
 Bibcode:
 2022ApJ...926..137M
 Keywords:

 343;
 902;
 339;
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 Astrophysics  Cosmology and Nongalactic Astrophysics;
 High Energy Physics  Phenomenology
 EPrint:
 v2 matches the published article, with number of spectrometerhours in caption of table 3 edited