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Here is an idea I want to present, about what happened after the Big Bang.The hypothesis I think makes more sense says that time and space existed at the moment of BB and something before that doesn’t make sense since there’s no time to back to. You want to know what’s going on at a time before the BB but if the universe begins to exist at the moment zero that time before moment z cannot exist.
So the beginning doesn’t need a prior cause.
Of course it’s a hypothesis, and It may be wrong but it makes some sense. Now the idea that I want to bring is that time may have went into two directions from the BB on.
It follows then that the past is created and it’s also 14.7 b years in the other direction of time.
The particles created in the reverse running time are mostly antiparticles as seen from our perspective but they would seem normal as seen from observers made of antimatter that went backwards. Occasionally we can detect antimatter as simple new strands originated from our perspective.
I also have another idea about time reversibility. In the delayed choice quantum erased experiment some may conclude that the past can be changed based on what happens in the present.
For example you could write down on paper an x=5 for a detection corresponding for a lump pattern then after say 10 minutes (we imagine a 10min delay path) you detect x=7 that corresponds to an interference pattern. You look down on the page you have written but you see 7 not 5 and basically you would remember 7 and not realize the past has changed in your mind as well.
More like 13.7, and your wording suggests that spacetime has an age, which it dooesn't. We occupy a region of it 13.7 BY from the BB, but that doesn't mean that the other parts of spacetime don't exist. Any anti-universe such as you are describing similarly doesn't have an age. To suggest it does is to suggest just separate space existing within time, and then we're back to the universe as something that 'happened' in time and needs a real cause.
The way I imagined it is with the present and past existing at the same time but the future doesnít.
However, this seems confusing because at the moment of big bang there was no past no future
at the c reference.