Dark matter from 't Hooft anomaly matching

Light fermions that arise as composite states in confining gauge theories are stable due to fermion number conservation. This leads to dark matter (DM) candidates that behave similarly to elementary DM but where the cosmological stability arises automatically from the accidental symmetries of the theory. We present explicit models based on 't Hooft anomaly matching conditions where DM is charged under the SM. For example an SU(N) gauge theory with fermions in the adjoint rep and triplet of SU(2)(L) gives rise to DM made of multiple Wino triplets, while SO(N) gauge theories with N-F = N - 4 flavors produce neutralinolike systems or SM quintuplets. Compositeness effects are crucial to determine the phenomenology.

Automated summary

Light fermions that emerge as composite states in confining gauge theories are stable, leading to dark matter candidates that exhibit characteristics similar to elementary dark matter, with cosmological stability stemming from the accidental symmetries of the theory.Explicit models based on 't Hooft anomaly matching conditions are presented, where dark matter is charged under the Standard Model, showing examples like multiple Wino triplets in an SU(N) gauge theory or neutralinolike systems in SO(N) gauge theories with specific flavor variations. Compositeness effects play a crucial role in determining the phenomenology.