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• W1914446677 abstract "We discuss thermal production of (pseudo) goldstinos, the Goldstone fermions emerging from (multiple) SUSY breaking sectors, when the reheating temperature is well below the superpartner masses. In such a case, the production during matter-dominated era induced by inflaton decay stage is more important than after reheating. Depending on the SUSY breaking scale, goldstinos are produced by freeze-in or freeze-out mechanism via $1to 2$ decays and inverse decays. We solve the Boltzmann equation for the momentum distribution function of the goldstino.In the freeze-out case, goldstinos maintain chemical equilibrium far after they are kinetically decoupled from the thermal bath, and consequently goldstinos with different momentum decouple at different temperatures. As a result their momentum distribution function shows a peculiar shape and the final yield is smaller than if kinetic equilibrium was assumed. We revisit the cosmological implications in both R-parity-conserving and R-parity-violating supersymmetric scenarios. For the former, thermally produced goldstinos can still be abundant enough to be dark matter at present times even if the reheating temperature is low, of order $1$ GeV. For the latter, if the reheating temperature is low, of order $0.1-1$ GeV, they are safe from the BBN constraints." @default.
• W1914446677 created "2016-06-24" @default.
• W1914446677 creator A5085111363 @default.
• W1914446677 creator A5089582855 @default.
• W1914446677 date "2015-08-04" @default.
• W1914446677 modified "2023-10-14" @default.
• W1914446677 title "Thermal Goldstino production with low reheating temperatures" @default.
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• W1914446677 doi "https://doi.org/10.1103/physrevd.92.035002" @default.
• W1914446677 hasPublicationYear "2015" @default.
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