Non-Gaussianity in the cosmic microwave background induced by dipolar dark matter

Journal Article · Fri Feb 01 04:00:00 EST 2013 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2013/02/022· OSTI ID:22283022

Blanchet, Luc; Marsat, Sylvain ^[1]; Langlois, David ^[2]

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1. GRECO, Institut d'Astrophysique de Paris — UMR 7095 du CNRS, Université Pierre and Marie Curie, 98 bis boulevard Arago, 75014 Paris (France)
2. Astroparticle and Cosmologie (CNRS-Université Paris 7), 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13 (France)

In previous work [L. Blanchet and A. Le Tiec, Phys. Rev. D 80 (2009) 023524], motivated by the phenomenology of dark matter at galactic scales, a model of dipolar dark matter (DDM) was introduced. At linear order in cosmological perturbations, the dynamics of the DDM was shown to be identical to that of standard cold dark matter (CDM). In this paper, the DDM model is investigated at second order in cosmological perturbation theory. We find that the internal energy of the DDM fluid modifies the curvature perturbation generated by CDM with a term quadratic in the dipole field. This correction induces a new type of non-Gaussianity in the bispectrum of the curvature perturbation with respect to standard CDM. Leaving unspecified the primordial amplitude of the dipole field, which could in principle be determined by a more fundamental description of DDM, we find that, in contrast with usual models of primordial non-Gaussianities, the non-Gaussianity induced by DDM increases with time after the radiation-matter equality on super-Hubble scales. This distinctive feature of the DDM model, as compared with standard CDM, could thus provide a specific signature in the CMB and large-scale structure probes of non-Gaussianity.

• OSTI ID: 22283022
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 02 Vol. 2013; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
AMPLITUDES
COMPARATIVE EVALUATIONS
CORRECTIONS
COSMOLOGICAL MODELS
COSMOLOGY
DIPOLES
GALAXIES
NONLUMINOUS MATTER
PERTURBATION THEORY
RELICT RADIATION