Both Einstein and Minkowski made it abundantly clear that neither space nor time exist independently and that they instead form a continuum called space-time, which is actually a single phenomenon.
Unless a facet of our reality which we refer to as space, pre-existed the singular event known as the big -bang, there wouldn't even have been a pseudo-medium into which the big bang could have emerged and as stated above, space and time being a single phenomenon means that where space exists , so too does time. From this I can only conclude that an instance of space-time did indeed pre-exist the big bang
The facet of the space-time continuum, which we refer to as time,is most peculiar, because while space is undergoing its current phase of metric expansion, time AKA progression, follows suite and also increases its separation from the big bang, (resulting in the phenomenon we call entropy. )
However If the space-time of our universe was contracting instead of expanding time would once again progress in the same direction as space but in a contracting universe that progression would be toward instead of away from the big bang. Does that mean that time would run backwards? No !!! as a probably fictitious military commander whose army was retreating was supposed to have said,,, "We are not retreating!" "We are just advancing in a different direction!
Cause would still precede effect but entropy would be reversed, Strange,,,,Yes!!! But, at least not paradoxical
As anyone who has read this far, can probably tell, I am a proponent of cyclical/ bounce cosmology and as strange as my latest thoughts on this subject may seem they could offer an explanation for the apparent anomaly which required the proposal of a period of faster than light inflation in order to make the figures add up
with expansion theory.
Its rather late now so I will continue with this post tomorrow.