Origin/Theory of the Universe by Russian Cosmologist? I didn't mean to imply I believe that time stops but more asking in general what is time? Can time go forward and backwards? I have - in my own very limited knowledge of physics - believed that time is simply the expansion of the universe.
Considering the "big bang" theory (which I do not subscribe to) - did time exist before the singularity expanded and did the space that it expanded into exist - or is that space created as the universe expands? If we believe that the universe is expanding then our reference point for time would be measured from the point of its "creation" until its current state of expansion, or at any referential points during that expansion, and therefore can only go forward (expansion). When we see the light from a distant star we are viewing the image of something from the past - from back in time - if we could get a close-up view of that image we would be viewing history of events that occured then - but that has already passed - all we are seeing is an image. Could I now interject myself into that image and change some event, i.e. time travel? All I can do is see the image - I am not able to participate in it.
The earth orbits the sun, which orbits the center of the galaxy which is expanding into space always moving in one direction - each finite moment of that movement is an image in time so to speak. If we could travel faster than the light from that image we could view some event from the past - but so far as we know that is impossible - and even if we could how could we insert ourselves into it? So, for me, time travel is theoretically impossible but perhaps I don't fully understand the concept of worm-holes or "bending the fabric of time-space" - way beyond my comprehension.
Further - if the theory of expansion/contraction of the universe is considered - during the contraction would time then go "backwards?" This is why, in my very uneducated view, the idea of "recirculating" universe as you have mentioned - although over my head - makes much more sense. The current explanations being posited about "dark matter" - to me - are not viable. We know that the universe has much more space than matter - even within the minute atomic particles the space between them is realtively much greater than the size of the particles. So as of now "space" is something beyond human comprehension To diverge to a simpleton's view - Space is the canvas on which the universe is painted - everything is a concoction of time, space and energy. The time/space continuum - space could exist without time but can time exist without space?
I apologize for my rather simplistic notions. I would enjoy your recommendations for further study/reading and thank you so much for sharing your knowledge.