https://doi.org/10.1140/epjc/s10052-024-12992-3
Regular Article - Theoretical Physics
Revisiting cosmological constraints on supersymmetric SuperWIMPs
1
Department of Physics, ARC Centre of Excellence for Dark Matter Particle Physics, The University of Adelaide, 5005, Adelaide, SA, Australia
2
School of Physics, Sydney Consortium for Particle Physics and Cosmology, The University of New South Wales, 2052, Sydney, NSW, Australia
c
dipan.sengupta@adelaide.edu.au
Received:
19
September
2023
Accepted:
3
June
2024
Published online:
5
July
2024
SuperWIMPs are extremely weakly interacting massive particles that inherit their relic abundance from late decays of frozen-out parent particles. Within supersymmetric models, gravitinos and axinos represent two of the most well motivated superWIMPs. In this paper we revisit constraints on these scenarios from a variety of cosmological observations that probe their production mechanisms as well as the superWIMP kinematic properties in the early Universe. We consider in particular observables of Big Bang Nucleosynthesis and the Cosmic Microwave Background (spectral distortion and anisotropies), which limit the fractional energy injection from the late decays, as well as warm and mixed dark matter constraints derived from the Lyman-
forest and other small-scale structure observables. We discuss complementary constraints from collider experiments, and argue that cosmological considerations rule out a significant part of the gravitino and the axino superWIMP parameter space.
© Crown 2024
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Funded by SCOAP3.
