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Possible astrophysical signatures of heavy stable neutral relics in supergravity models

Rouzbeh Allahverdi·Kari Enqvist·Anupam Mazumdar
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Abstract

We consider heavy stable neutral particles in the context of supergravity and show that a gravitationally suppressed inflaton decay can produce such particles in cosmologically interesting abundances within a wide mass range $10^3 {\rm GeV} \leq m_X \leq 10^{11} {\rm GeV}$. In gravity-mediated supersymmetry breaking models, a heavy particle can decay into its superpartner and a photon-photino pair or a gravitino. Such decays only change the identity of a possible dark matter candidate. However, for $10^3 {\rm GeV} \leq m_X \leq 10^7 {\rm GeV}$, astrophysical bounds from gamma-ray background and photodissociation of light elements can be more stringent than the overclosure bound, thus ruling out the particle as a dark matter candidate.

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Rouzbeh Allahverdi, Kari Enqvist, Anupam Mazumdar. 2001-11-23. Possible astrophysical signatures of heavy stable neutral relics in supergravity models. https://doi.org/10.1103/physrevd.65.103519

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