Constraining light gravitino mass from cosmic microwave background

Kazuhide Ichikawa, Masahiro Kawasaki, Kazunori Nakayama, Toyokazu Sekiguchi, Tomo Takahashi

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11 Citations (Scopus)


We investigate the possibilities of constraining the light gravitino mass m 3/2 from future cosmic microwave background (CMB) surveys. A model with light gravitino with the mass m 3/2< O (10)eV is of great interest since it is free from the cosmological gravitino problem and, in addition, can be compatible with many baryogenesis/leptogenesis scenarios such as the thermal leptogenesis. We show that the lensing of CMB anisotropies can be a good probe for m 3/2 and obtain an expected constraint on m 3/2 from precise measurements of lensing potential in the future CMB surveys, such as the PolarBeaR and CMBpol experiments. If the gravitino mass is m 3/2 = 1eV, we will obtain the constraint for the gravitino mass as m 3/23.2eV(95%C.L.) for the case with Planck+PolarBeaR combined and m 3/2 = 1.04 +0.22 -0.26eV(68%C.L.) for CMBpol. The issue of Bayesian model selection is also discussed.

Original languageEnglish
Article number013
JournalJournal of Cosmology and Astroparticle Physics
Issue number8
Publication statusPublished - 2009
Externally publishedYes


  • Cosmological parameters from CMBR
  • Cosmology of theories beyond the SM
  • Gravitational lensing
  • Supersymmetry and Cosmology

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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