Goldstino decoupling in spontaneously broken supergravity theories

Tony Gherghetta

doi:10.1016/S0550-3213(96)00608-6

Goldstino decoupling in spontaneously broken supergravity theories

Tony Gherghetta

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

If the gravitino is sufficiently light and stable it will behave as an effective massless neutrino species at the time of nucleosynthesis. Depending on the temperature at which it decouples from the thermal bath in the early universe, the gravitino mass will be bounded by the primordial ⁴He abundance. Assuming a conservative estimate that the number of neutrino families, N_v < 3.6, superlight gravitinos with a mass m_3/2 ≲ 10^-6 eV are ruled out. This bound is weaker than previous estimates because the Goldstino annihilation cross section was overestimated.

Original language	English (US)
Pages (from-to)	25-37
Number of pages	13
Journal	Nuclear Physics B
Volume	485
Issue number	1-2
DOIs	https://doi.org/10.1016/S0550-3213(96)00608-6
State	Published - Feb 3 1997
Externally published	Yes

Bibliographical note

Funding Information:
We would like to thank Ganesh Devaraj, Marty Einhorn and Steve Martin for useful conversations. This work was supported by the U.S. Department of Energy at the University of Michigan.

Keywords

Decoupling
Gravitino
Nucleosynthesis
Supergravity

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title = "Goldstino decoupling in spontaneously broken supergravity theories",

abstract = "If the gravitino is sufficiently light and stable it will behave as an effective massless neutrino species at the time of nucleosynthesis. Depending on the temperature at which it decouples from the thermal bath in the early universe, the gravitino mass will be bounded by the primordial 4He abundance. Assuming a conservative estimate that the number of neutrino families, Nv < 3.6, superlight gravitinos with a mass m3/2 ≲ 10-6 eV are ruled out. This bound is weaker than previous estimates because the Goldstino annihilation cross section was overestimated.",

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N2 - If the gravitino is sufficiently light and stable it will behave as an effective massless neutrino species at the time of nucleosynthesis. Depending on the temperature at which it decouples from the thermal bath in the early universe, the gravitino mass will be bounded by the primordial 4He abundance. Assuming a conservative estimate that the number of neutrino families, Nv < 3.6, superlight gravitinos with a mass m3/2 ≲ 10-6 eV are ruled out. This bound is weaker than previous estimates because the Goldstino annihilation cross section was overestimated.

AB - If the gravitino is sufficiently light and stable it will behave as an effective massless neutrino species at the time of nucleosynthesis. Depending on the temperature at which it decouples from the thermal bath in the early universe, the gravitino mass will be bounded by the primordial 4He abundance. Assuming a conservative estimate that the number of neutrino families, Nv < 3.6, superlight gravitinos with a mass m3/2 ≲ 10-6 eV are ruled out. This bound is weaker than previous estimates because the Goldstino annihilation cross section was overestimated.

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KW - Nucleosynthesis

KW - Supergravity

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Goldstino decoupling in spontaneously broken supergravity theories

Abstract

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Keywords

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