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Right-handed sneutrino condensate cold dark matter and the baryon-to-dark matter ratio.

McDonald, John (2007) Right-handed sneutrino condensate cold dark matter and the baryon-to-dark matter ratio. Journal of Cosmology and Astroparticle Physics, 2007 (01). 001. ISSN 1475-7516

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    Abstract

    The similarity of the observed densities of baryons and cold dark matter suggests that they have a common or related origin. This can be understood in the context of the MSSM with right-handed (RH) sneutrinos if cold dark matter is due to a d = 4 flat direction condensate of very weakly coupled RH sneutrino LSPs and the baryon asymmetry is generated by Affleck–Dine leptogenesis along the d = 4 (HuL)2 flat direction. The correct density of RH sneutrino dark matter is obtained if the reheating temperature is in the range 106–108 GeV. A cold dark matter isocurvature perturbation close to present observational bounds is likely in the case of inflation driven by a D-term or by an F-term with suppressed Hubble corrections to the A-terms. An observable baryon isocurvature perturbation is also possible in the case of D-term inflation models.

    Item Type: Article
    Journal or Publication Title: Journal of Cosmology and Astroparticle Physics
    Uncontrolled Keywords: dark energy theory ; baryon asymmetry ; inflation
    Subjects: Q Science > QC Physics
    Departments: Faculty of Science and Technology > Physics
    ID Code: 11390
    Deposited By: Dr John McDonald
    Deposited On: 14 Aug 2008 13:28
    Refereed?: Yes
    Published?: Published
    Last Modified: 18 Sep 2013 16:02
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/11390

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