Before you say anything, I know that the big crunch is unaccepted due to the increasing speed in the universe's expansion.
But just imagine the big crunch happens. The universe expands (big bang) and retract (the big crunch). It'll do this forever. As for what it's pumping: perhaps energy, or matter, or simply spacetime itself.
To us it seems way too slow to be a heart beat, but that's just because we are very very small
I'll add that each beat is a beginning of a completely different spacetime. Big bang = point 0 of spacetime, but it isn't the first time it pumped. Like I said, completely separate spacetimes.
But just imagine the big crunch happens. The universe expands (big bang) and retract (the big crunch). It'll do this forever. As for what it's pumping: perhaps energy, or matter, or simply spacetime itself.
To us it seems way too slow to be a heart beat, but that's just because we are very very small
I'll add that each beat is a beginning of a completely different spacetime. Big bang = point 0 of spacetime, but it isn't the first time it pumped. Like I said, completely separate spacetimes.