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Constraints on dark-matter properties from large-scale structure

Author
Kunz, Martin; Nesseris, Savvas; Sawicki, Ignacy
Entity
UAM. Departamento de Física Teórica
Publisher
American Physical Society
Date
2016-07-08
Citation
Physical Review D 94. 2 (2016): 023510
ISSN
2470-0010 (print); 2470-0029 (online)
DOI
10.1103/PhysRevD.94.023510
Funded by
We are grateful to R. Durrer, C. Germani, E. Komatsu and O. Pujolás for fruitful discussions and comments. M. K. acknowledges funding by the Swiss National Science Foundation. S. N. is supported by the Research Project of the Spanish MINECO, FPA2013-47986-03-3P, the Centro de Excelencia Severo Ochoa Program SEV- 2012-0249 and the Ramón y Cajal program through Grant No. RYC-2014-15843. I. S. is supported by the Maria Sklodowska-Curie Intra-European Fellowship Project “DRKFRCS.” The numerical computations for our analysis were performed on the Baobab cluster at the University of Geneva. I. S. and M. K. thank the Galileo Galilei Institute for hospitality during the final stages of this project. This work is based in part on observations obtained with Planck [57], an ESA science mission with instruments and contributions directly funded by ESA Member States, NASA, and Canada. The development of Planck was supported by ESA; CNES and CNRS/INSU- IN2P3-INP (France); ASI, CNR, and INAF (Italy); NASA and DoE (United States); STFC and UKSA (United Kingdom); CSIC, MICINN and JA (Spain); Tekes, AoF and CSC (Finland); DLR and MPG (Germany); CSA (Canada); DTU Space (Denmark); SER/SSO (Switzerland); RCN (Norway); SFI (Ireland); and FCT/MCTES (Portugal). A description of the Planck Collaboration and a list of its members, including the technical or scientific activities in which they have been involved, can be found at Ref
Project
Gobierno de España. FPA2013-47986-03-3P; Gobierno de España. SEV- 2012-0249; Gobierno de España. RYC-2014-15843; info:eu-repo/grantAgreement/EC/FP7/629459
Editor's Version
http://dx.doi.org/10.1103/PhysRevD.94.023510
Subjects
Constraints; Large-scale structure; Física
URI
http://hdl.handle.net/10486/677525
Rights
© 2016 American Physical Society

Abstract

We use large-scale cosmological observations to place constraints on the dark-matter pressure, sound speed and viscosity and infer a limit on the mass of warm-dark-matter particles. Measurements of the cosmic microwave background anisotropies constrain the equation of state and sound speed of the dark matter (DM) at last scattering at the per mille level. Since the redshifting of collisionless particles universally implies that these quantities scale like a-2 absent shell crossing, we infer that today w(DM) ‹10-10.0, cs2,(DM) ‹10-10.7 and cvis2,(DM) ‹10-10.3 at the 99% confidence level. This very general bound can be translated to model-dependent constraints on dark-matter models: For warm dark matter these constraints imply m › 70 eV, assuming it decoupled while relativistic around the same time as the neutrinos; for a cold relic, we show that m › 100 eV. We separately constrain the properties of the DM fluid on linear scales at late times and find upper bounds cs2,(DM) ‹10-5.9 and cvis2,(DM) ‹10-5.7, with no detection of nondust properties for the DM
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