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Physical Review D

    Gravitino cosmology with a very light neutralino

    Herbi K. Dreiner* and Marja Hanussek†

    Jong Soo Kim‡

    Subir Sarkar§

    • Bethe Center for Theoretical Physics and Physikalisches Institut, University of Bonn, Bonn, Germany

    • Institut für Physik, Technische Universität Dortmund, Dortmund, Germany, and ARC Centre of Excellence for Particle Physics at the Terascale, School of Chemistry and Physics, University of Adelaide, Adelaide, Australia

    • Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Oxford OX1 3NP, UK
    • *dreiner@th.physik.uni-bonn.de
    • †hanussek@th.physik.uni-bonn.de
    • ‡jongsoo.kim@tu-dortmund.de
    • §s.sarkar@physics.ox.ac.uk
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    Phys. Rev. D 85, 065027 – Published 30 March, 2012

    DOI: https://doi.org/10.1103/PhysRevD.85.065027

    Abstract

    It has been shown that very light or even massless neutralinos are consistent with all current experiments, given nonuniversal gaugino masses. Furthermore, a very light neutralino is consistent with astrophysical bounds from supernovae and cosmological bounds on dark matter. Here we study the cosmological constraints on this scenario from big bang nucleosynthesis (taking gravitinos into account) and find that a very light neutralino is even favored by current observations.

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    Phys. Rev. D 85, 065027– Published 30 March, 2012
    • Received 9 December 2011

    © 2012 American Physical Society

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