Dark matter velocity dispersion effects on CMB and matter power spectra

Journal Article · Mon Feb 01 00:00:00 EST 2016 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2016/02/024· OSTI ID:22525016

Piattella, O. F.; Casarini, L.; Fabris, J. C. ^[1]; Pacheco, J.A. de Freitas, ^[2]

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1. Department of Physics, Universidade Federal do Espírito Santo, avenida Fernando Ferrari 514, 29075-910 Vitória, Espírito Santo (Brazil)
2. Université de Nice-Sophia Antipolis, Observatoire de la Côte d'Azur, Laboratoire Lagrange, Nice Cedex 4 (France)

Effects of velocity dispersion of dark matter particles on the CMB TT power spectrum and on the matter linear power spectrum are investigated using a modified CAMB code. Cold dark matter originated from thermal equilibrium processes does not produce appreciable effects but this is not the case if particles have a non-thermal origin. A cut-off in the matter power spectrum at small scales, similar to that produced by warm dark matter or that produced in the late forming dark matter scenario, appears as a consequence of velocity dispersion effects, which act as a pressure perturbation.

• OSTI ID: 22525016
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2016, Issue 02; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
C CODES
COMPUTERIZED SIMULATION
DISTURBANCES
ENERGY SPECTRA
NONLUMINOUS MATTER
RELICT RADIATION
THERMAL EQUILIBRIUM
VELOCITY