Are cosmic voids filled with reconnecting magnetic fields from the early Universe?

It has been suggested that the weak magnetic field hosted by the intergalactic medium (IGM) in cosmic voids might be a relic from the early Universe. If so, the strength and coherence length of void fields could be "predicted" from reasonable assumptions about the properties of the primordial field at its genesis, provided the evolution of the field in the intervening time were understood. Inversely, cosmological models of primordial magnetogenesis could be constrained by precise observations of the void fields. In this talk, I shall argue that the plasma physics of magnetic reconnection in the primordial plasma is key to understanding the evolution of the primordial fields; the reconnection-controlled decay theory that I present resolves a number of historical discrepancies between theory, numerics, and observations.