Pedersen, C;
Font-Ribera, A;
Kitching, TD;
McDonald, P;
Bird, S;
Slosar, A;
Rogers, KK;
(2020)
Massive neutrinos and degeneracies in Lyman-alpha forest simulations.
Journal of Cosmology and Astroparticle Physics
, 2020
, Article 025. 10.1088/1475-7516/2020/04/025.
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Abstract
Using a suite of hydrodynamical simulations with cold dark matter, baryons, and neutrinos, we present a detailed study of the effect of massive neutrinos on the 1-D and 3-D flux power spectra of the Lyman-α (Lyα) forest. The presence of massive neutrinos in cosmology induces a scale- and time-dependent suppression of structure formation that is strongest on small scales. Measuring this suppression is a key method for inferring neutrino masses from cosmological data, and is one of the main goals of ongoing and future surveys like eBOSS, DES, LSST, Euclid or DESI . The clustering in the Lyα forest traces the quasi-linear power at late times and on small scales. In combination with observations of the cosmic microwave background, the forest therefore provides some of the tightest constraints on the sum of the neutrino masses. However there is a well-known degeneracy between Σmν and the amplitude of perturbations in the linear matter power spectrum. We study the corresponding degeneracy in the 1-D flux power spectrum of the Lyα forest, and for the first time also study this degeneracy in the 3-D flux power spectrum. We show that the non-linear effects of massive neutrinos on the Lyα forest, beyond the effect of linear power amplitude suppression, are negligible, and this degeneracy persists in the Lyα forest observables to a high precision. We discuss the implications of this degeneracy for choosing parametrisations of the Lyα forest for cosmological analysis.
| Type: | Article |
|---|---|
| Title: | Massive neutrinos and degeneracies in Lyman-alpha forest simulations |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1088/1475-7516/2020/04/025 |
| Publisher version: | https://doi.org/10.1088/1475-7516/2020/04/025 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10097983 |
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