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In single-component theories of dark matter, the $2\to 2$ amplitudes fordark-matter production, annihilation, and scattering can be related to eachother through various crossing symmetries. These crossing relations lie at theheart of the celebrated complementarity which underpins different existingdark-matter search techniques and strategies. In multi-component theories ofdark matter, by contrast, there can be many different dark-matter componentswith differing masses. This then opens up a new, "diagonal" direction fordark-matter complementarity: the possibility of dark-matter decay from heavierto lighter dark-matter components. In this work, we discuss how this newdirection may be correlated with the others, and demonstrate that the enhancedcomplementarity which emerges can be an important ingredient in probing andconstraining the parameter spaces of such models.

A New Direction in Dark-Matter Complementarity: Dark-Matter Decay as a Complementary Probe of Multi-Component Dark Sectors