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In supersymmetric axion models, if the gravitino or axino is the lightestSUSY particle (LSP), the other is often the next-to-LSP (NLSP). We investigatethe cosmology of such a scenario and point out that the lifetime of the NLSPnaturally becomes comparable to the present age of the universe in a viableparameter region. This is a well-motivated example of the so-called decayingdark matter model, which is recently considered as an extension of the$\Lambda$CDM model to relax some cosmological tensions.

Gravitino/Axino as Decaying Dark Matter and Cosmological Tensions