Testing for new physics: neutrinos and the primordial power spectrum

We test the sensitivity of neutrino parameter constraints from combinations of CMB and LSS data sets to the assumed form of the primordial power spectrum (PPS) using Bayesian model selection. Significantly, none of the tested combinations, including recent high-precision local measurements of H{sub...

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Bibliographic Details
Published in:Journal of cosmology and astroparticle physics 2016-09, Vol.2016 (9), p.22-22
Main Authors: Canac, Nicolas, Aslanyan, Grigor, Abazajian, Kevork N., Easther, Richard, Price, Layne C.
Format: Article
Language:English
Subjects:
ABUNDANCE
ACCURACY
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
DEGREES OF FREEDOM
ENERGY DENSITY
MASS
NEUTRINOS
RELATIVISTIC RANGE
RELICT RADIATION
SENSITIVITY
SIMULATION
SPECTRA
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Summary:We test the sensitivity of neutrino parameter constraints from combinations of CMB and LSS data sets to the assumed form of the primordial power spectrum (PPS) using Bayesian model selection. Significantly, none of the tested combinations, including recent high-precision local measurements of H{sub 0} and cluster abundances, indicate a signal for massive neutrinos or extra relativistic degrees of freedom. For PPS models with a large, but fixed number of degrees of freedom, neutrino parameter constraints do not change significantly if the location of any features in the PPS are allowed to vary, although neutrino constraints are more sensitive to PPS features if they are known a priori to exist at fixed intervals in log k . Although there is no support for a non-standard neutrino sector from constraints on both neutrino mass and relativistic energy density, we see surprisingly strong evidence for features in the PPS when it is constrained with data from Planck 2015, SZ cluster counts, and recent high-precision local measurements of H{sub 0}. Conversely combining Planck with matter power spectrum and BAO measurements yields a much weaker constraint. Given that this result is sensitive to the choice of data this tension between SZ cluster counts, Planck and H{sub 0} measurements is likely an indication of unmodeled systematic bias that mimics PPS features, rather than new physics in the PPS or neutrino sector.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2016/09/022