, Volume 28, Issue 6, pp L699–L703 | Cite as

Constraint on unstable photino mass from a superlight gravitino

  • Tanmoy Bhattacharya
  • Probir Roy
Rapid Communications


The known lower bound on the unstable photino mass gets invalidated by a gravitino lighter than 10−3 eV. Nevertheless, general bounds can be derived by feeding early universe constraints from the primary abundance of He4 and the extant lower bound on the gravitino mass into the lifetime for the decay photino → photon + gravitino. The mass-rangeO(100) eV toO(1) MeV is excluded.


Unstable photino gravitino supersymmetry 


14.80 11.30 98.80 


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Copyright information

© Indian Academy of Sciences 1987

Authors and Affiliations

  • Tanmoy Bhattacharya
    • 1
  • Probir Roy
    • 1
  1. 1.Tata Institute of Fundamental ResearchBombayIndia

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