Abstract
The dark‐matter candidates of particle physics invariably possess electromagnetic interactions, if only at loop level. Light, in passing through dark matter, can thus exhibit frequency‐dependent effects, exhibiting a refractive index which deviates from its vacuum value. Its real part gives dispersive effects in propagation: such are signalled through systematic, frequency‐dependent time delays in the observed light curves of cosmologically distant gamma‐ray bursts. We review the theoretical framework for their analysis and use observations of gamma‐ray‐burst radio afterglows to set a direct limit on the electric‐charge‐to‐mass ratio of dark matter.
Published Version
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