ASTROPHYSICAL BOUNDS ON SUPERLIGHT GRAVITINOS

We derive the allowed mass range for the superlight gravitino present in a large class of supersymmetric models from the observed neutrino l uminosity from Supernova 1987A. We find that for photino masses of ord er of 100 GeV, the mass range 2.6 x 10(-8) eV less than or equal to mg < 2.2 x 10(-6) eV for the gravitino (g) over tilde is excluded by SN1 987A observations, Unlike the bounds on mg from nucleosynthesis, the b ounds in the present paper do not depend critically upon the uncertain ties of the observational input. (C) 1997 Elsevier Science B.V.