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Naty1
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Wondering about "time"?
...Just as acceleration and gravity have underlying symmetries, here's an interesting example of where space and time may be linked in hidden ways ...and just how "essential" time may really be...
In Fabric of the Cosmos, Brian Greene says in a footnote (Chapter 12, #7,Page 527)
And here's another twist: (footnote # 6, Page 527)
"We know a lot; We understand little."
...Just as acceleration and gravity have underlying symmetries, here's an interesting example of where space and time may be linked in hidden ways ...and just how "essential" time may really be...
In Fabric of the Cosmos, Brian Greene says in a footnote (Chapter 12, #7,Page 527)
It's somewhat of misnomer to speak of the "center" of a black hole as if it were a place in space...Just as you can't resist going from one second to the next in time, you can't resist being pulled to the black holes "center" once you've crossed the event horizon...Thus rather than thinking of the black holes center as a location in space it is better to think of it as a location in time...it may be true that its ...where spacetime comes to an end...if we had equations that don't break down deep inside a black hole we might gain important insights into the nature of time...
And here's another twist: (footnote # 6, Page 527)
In the central Wheeler Dewitt equation it turns out that the time variable does not appear ...so rather than having an explicit mathematical embodiment of time -as is the case in every other fundamental theory- in this approach to quantizing gravity temporal evolution must be kept track of by a physical feature of the universe (such as density) that we expect to change in a regular manner...as yet no one knows if this procedure for quantizing gravity is appropriate...is this hinting that time is an emergent conept?
"We know a lot; We understand little."