http://www.physorg.com/news68899463.html
these time tunneling effects occur due variations of light speed that produces anysotropy of electromagnetic fields,that permits differents time to each part of motion to light speed,and yuor reversion that remain not in the same plane of polarization to speed of loght.then light speed is altered by the tunneling of time,that produce infinities parts of times to space-time-have advanced and retarded opperator to these waves functions thare modify in these medium,and to each part of advance and reversion of the potential,has part that go backward in time and other part of the curvatures forward in time and generate the "holes" that to part that belongs neither future-time&- and past-time&+ =0
antonio carlos motta