Correlation Between the Effective Neutrino Number and Curvature

Details Correlation Between the Effective Neutrino Number and Curvature Correlation Between the Effective Neutrino Number and Curvature

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21914303s&link_type=abstract

American Astronomical Society, AAS Meeting #219, #143.03

Computer Science

Sound

Scientific paper

Cosmological data seems to favor models with more than three neutrinos. This poster focuses on recent discussion regarding additional sterile neutrinos and neutrino mass constraints in cosmology. We present a theoretical argument for correlation between the number of effective neutrinos and the curvature of the universe. This naturally arises from simple considerations of distance measurements. For example, with the degree of damping prior to recombination fixed by observation, we find that if we allow for an open universe then the angular diameter distance increases. To counterbalance this effect the sound horizon distance must increase as well which corresponds to decreasing the effective neutrino number. This qualitative argument is confirmed by statistical analysis with CosmoMC adapted to include CMB anisotropy measurements from a variety of experiments. This research was supported by Asantha Cooray at the University of California, Irvine.

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