Artigo
Constraining models with superlight gravitino, scalar and pseudoscalar particles
Fecha
2000-06-07Registro en:
Modern Physics Letters A, v. 15, n. 17, p. 1099-1106, 2000.
0217-7323
10.1142/S0217732300001377
WOS:000088423300002
2-s2.0-0034616608
Autor
Universidade São Judas Tadeu
Universidade Estadual Paulista (Unesp)
Resumen
In some supergravity models there are light weakly coupled scalar (S)-and pseudoscalar (P) particles. These particles arise following a superlight gravitino. In these models the decay SIP → γγ exists. We examine constraints on this process considering these photons as responsible by the extragalactic background light. We also consider the amount of SIP particles produced through the fusion of the cosmic background photons and contributing to the effective number of light neutrino species during primordial nucleosynthesis. We obtain bounds on the gravitino mass complementary to the existing ones.