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shminux comments on Open Thread, May 11 - May 17, 2015 - Less Wrong
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If you already postulate having enough negative energy to create a wormhole, there is no extra issues due to one of the throats having negative mass, except the weird acceleration effect, as I mentioned in my other reply.
Maybe. However, how will the geometry look like when the sign flip occurs? Will it be non-singular?
There isn't as much difference between negative- and positive-mass wormholes as between negative- and positive mass black holes. Negative-mass black holes have no horizons and a naked repulsive timelike singularity. A negative- (at infinity) mass wormhole would look basically like a regular wormhole. The local spacetime curvature would, of course, be different, but the topology would remain the same, S^2xRxR or similar.