On Saturday, 18 August 2018 18:14:59 UTC-4, Chris L Peterson wrote:
On Sat, 18 Aug 2018 13:33:31 -0400, Davoud wrote:

Chris L Peterson:

Not every
multiverse theory requires that it be impossible to transmit
information between them. And even more to the point, such theories
often predict certain things measurable in our own universe which
would argue for the existence of others, even without it being
possible to connect with them in any direct way.

This research is very important fundamental work.

To quote Fermi, "Where are they?"

Yours is one point of view. Another is that the "multiverse" is
nonsense, based on so-called "string theory," or "M-theory," which is
not a theory but only a guess, as it offers no means to test it.

The latter would be a view from the position of ignorance. There are
multiverse theories that do not descend from string theory or issues
of quantum gravity. Theories which, do, in fact, make testable
predictions. Exploring unlikely theories which go to the fundamentals
of cosmology is work that needs to be done.

String theory may be untestable, but it's the best theory going.