Well, this is outside my area of expertise (more of an amateur astrophysicist), but I think it is a serious examination of a somewhat fringe idea. Basically, it

Well, this is outside my area of expertise (more of an amateur astrophysicist), but I think it is a serious examination of a somewhat fringe idea. Basically, it is a theory paper asking the question of whether wormholes can explain the phenomenon, and if they were the cause, what would it look like? I wouldn't take the idea too seriously (and the paper's conclusion seems more like a "no" than a "yes" to me), but it does appear to be a sound examination of the question (though, I would appreciate comments from someone with more knowledge of relativity).