How to relax the cosmological neutrino mass bound

Oldengott IM, Barenboim G, Kahlen S, Salvado J, Schwarz D (2019)
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (4): 049.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Autor/in
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Abstract / Bemerkung
We study the impact of non-standard momentum distributions of cosmic neutrinos on the anisotropy spectrum of the cosmic microwave background and the matter power spectrum of the large scale structure. We show that the neutrino distribution has almost no unique observable imprint, as it is almost entirely degenerate with the effective number of neutrino flavours, N-eff, and the neutrino mass, m(nu). Performing a Markov chain Monte Carlo analysis with current cosmological data, we demonstrate that the neutrino mass bound heavily depends on the assumed momentum distribution of relic neutrinos. The message of this work is simple and has to our knowledge not been pointed out clearly before: cosmology allows that neutrinos have larger masses if their average momentum is larger than that of a perfectly thermal distribution. Here we provide an example in which the mass limits are relaxed by a factor of two.
Stichworte
neutrino masses from cosmology; cosmological neutrinos; cosmological; parameters from CMBR; cosmological parameters from LSS
Erscheinungsjahr
2019
Zeitschriftentitel
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Ausgabe
4
Art.-Nr.
049
ISSN
1475-7516
Page URI
https://pub.uni-bielefeld.de/record/2935881

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Oldengott IM, Barenboim G, Kahlen S, Salvado J, Schwarz D. How to relax the cosmological neutrino mass bound. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS. 2019;(4): 049.
Oldengott, I. M., Barenboim, G., Kahlen, S., Salvado, J., & Schwarz, D. (2019). How to relax the cosmological neutrino mass bound. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS(4), 049. doi:10.1088/1475-7516/2019/04/049
Oldengott, I. M., Barenboim, G., Kahlen, S., Salvado, J., and Schwarz, D. (2019). How to relax the cosmological neutrino mass bound. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS:049.
Oldengott, I.M., et al., 2019. How to relax the cosmological neutrino mass bound. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, (4): 049.
I.M. Oldengott, et al., “How to relax the cosmological neutrino mass bound”, JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2019, : 049.
Oldengott, I.M., Barenboim, G., Kahlen, S., Salvado, J., Schwarz, D.: How to relax the cosmological neutrino mass bound. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS. : 049 (2019).
Oldengott, Isabel M., Barenboim, Gabriela, Kahlen, Sarah, Salvado, Jordi, and Schwarz, Dominik. “How to relax the cosmological neutrino mass bound”. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS 4 (2019): 049.

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arXiv: 1901.04352

Inspire: 1713606

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