🚀 go-pugleaf

Green Dehydrated Amphibian <GDA@dragon.ch> wrote:
> 1915: Albert Einstein proposes the theory of general relativity, which
> equates gravity to the curvature of space-time. 

Technically, this is not what General Relativity does.  You can
also equate gravity with the curvature of space-time in Newtonian
Physics.  The structure is different: a 1-dimensional fibre bundle
with a 3-dimensional fibre.

What distinguishes General Relativity is NOT that it unifies
gravity and space-time curvature (since the unification is also
done with Newtonian gravity), but that it unifies it in the
setting of a Lorentzian manifold.

Even more to the point: even in Newtonian Physics, there will
still be a Big Bang Universe.

The existence of a Big Bang universe has nothing per se to do
with Relativity.  It comes from the simple logic of answering
the childhood question "why doesn't everything fall to the ground?"
(which, in adult terms, is rendered as "why doesn't everything
fall into each other?").

No matter where you start or what point of view you take, there
are only 4 alternatives.  Either
     (1) Everything IS falling into each other (or is about to
         start doing so)
     (2) Everything is flying apart from one another
     (3) Everything is in universal rotation
or
     (4) Gravity behaves different at long distances.

Not(4) implies (1) or (2) or (3).  Not (4) and not (3) imply (1) or (2).
And not (4), not (3) and not (2) imply (1).