Right-handed sneutrinos as curvatons

McDonald, John (2003) Right-handed sneutrinos as curvatons. Physical Review D, 68 (4). 043505-. ISSN 0556-2821, 1089-4918

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Abstract

We consider the possibility that a right-handed sneutrino can serve as the source of energy density perturbations leading to structure formation in cosmology. The cosmological evolution of a coherently oscillating condensate of right-handed sneutrinos is studied for the case where reheating after inflation is due to perturbative inflaton decays. For the case of Dirac neutrinos, it is shown that some suppression of Planck scale-suppressed corrections to the right-handed neutrino superpotential is necessary in order to have sufficiently late decay of the right-handed sneutrinos. cH2 corrections to the sneutrino mass squared term must also be suppressed during inflation (|c|≲0.1), in which case, depending on the magnitude of |c| during inflation, a significantly blue (if c>0) or red (if c<0) perturbation spectrum is possible. R parity must also be broken in order to ensure that the Universe is not overclosed by the lightest supersymmetric particles from the late decay (at temperatures 1-10 MeV) of the right-handed sneutrino condensate. The resulting expansion rate during inflation can be significantly smaller than in conventional supersymmetric inflation models (as low as 106 GeV is possible). For the case of Majorana neutrinos, a more severe suppression of Planck-suppressed superpotential corrections is required. In addition, the Majorana sneutrino condensate is likely to be thermalized before it can dominate the energy density, which would exclude the Majorana right-handed sneutrino as a curvaton.

Item Type:	Article
Additional Information:	LTH 570. arXiv Number: arXiv:hep-ph/0302222v4. Additional citation information: PHYSICAL REVIEW D 68, 043505 (2003); 0556-2821/2003/68(4)043505(10). 10 pages. Published 8 August 2003. Issue: August 2003.
Uncontrolled Keywords:	LARGE-SCALE STRUCTURE, CHAOTIC INFLATION, STANDARD MODEL, ENTROPY CRISIS, BARYOGENESIS, SUPERSYMMETRY, SUPERGRAVITY, BREAKING, PERTURBATIONS, DIRECTIONS
Subjects:	?? QC ??
Divisions:	Faculty of Science and Engineering > School of Physical Sciences > Mathematical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	14 Apr 2009 10:14
Last Modified:	24 May 2025 03:16
DOI:	10.1103/physrevd.68.043505
Related Websites:	Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/526