Mark, you're taking the fantasies of speculating astro-physicists way too seriously and profoundly under-estimating the challenges of simulations to do more than emulate.

Wherever these entities might be measured n space/time, they could be immediately in contact with us on earth wherever they are, in terms of quantum entanglement:

[www.youtube.com]

Multiverses have been proposed as astronomical speculations have failed experimental tests, bercause they are unwilling to propose non random models:

[www.youtube.com]

They got forced into wilder and wilder speculations as the evidence came in--so don't get your hopes up this time.

Something sciency that I might consider is Penrose (if I understood it):

[www.youtube.com]

Ray