Primordial wormhole
A primordial wormhole was a type of wormhole capable of producing a large gravitational anomaly that was hypothesized by Paul Stamets to be the cause of the DMA. 

New evidence showed that dhe DMA exhibited behavior inconsistiant with a primoridal wormhole. () Ruon Tarka later determined that Stamets hypothesis was "obviously, that's wrong." () 

Wormholes