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@lemouth Ok this is GREAT! And it's by Susskind. But this is not the one I'm talking about. However it is much newer so I'm going to check this out.

The one I was talking about was circa 2010 to 2012.
He and someone else were discussing the possibility of constructing an ARNN from a wormhole because a paper circa 1997 was discussing that one could compute the whole universe with a hypercomputer capable of computing reals.

The underlaying message was that a classical computer which had a receiver on one side and transmitter on the other, could calculate reals to arbitrary precision as long as the wormhole remained open with one mouth in the past and one in the future. Simply by sending the result of each computation to itself in the past.

Although with his latest paper it looks like Susskind has bought into "the whole multiverse is made of wormholes" camp. So I dunno. I'm skeptical.

I do recall the paper mentioning intentional blackhole collapse via huge EM fields, then when the fields were released. The two mouths taking off at light speed in opposite directions and "spelling possible trouble for the lab, and certain doom for the solar system it was situated in".