One-way-street time vs circular time
Posted: Tue Feb 20, 2018 8:56 am
This is just some speculation here, contrasting two different ways of thinking about time, and there is no evidence for either one (as far as I know).
I'm addressing the everyday notion of time here. Past, present, future. Passage of time, arrow of time, flow of time etc.
(I'm aware that for example on the quantum level, or in many traditions, reality can also be understood to be timeless, that's not the aspect I'm addressing here.)
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One-way-street time:
So we are born, we age, we die, and the world ages around us. Time and entropy always seem to flow in one direction. Time seems linear, an endless one-way-street, always flowing from the past towards the future.
The Bible also talks about "the beginning" and "end times", and so it is common to think of time as a one-way-street with a starting point and an ending point. According to the Bible, it's a finitely long one-way-street.
"Beginning" and "end" is discarded by many, but the underlying sensation of "one-way-street"-ness remains.
The Big Bang theory also usually implies that time is a one-way-street, with a beginning. That's where time started and there was no time before it. Some variations of it claim that the Big Bang was no beginning, and so the one-way-street continues further back, perhaps infinitely.
Some variations claim that the universe starts with a Big Bang and ends in a Big Crunch, and that's the start of the next universe. The next universe may be different or identical to this one. It's like an infinitely long chain of universes, where time still is a one-way-street.
(My personal opinion is that this picture is illogical, because finite things go on indefinitely.)
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Circular time:
There's an alternative that may be counterintuitive and hard to grasp. Take a finitely long one-way-street time and stitch the two loose ends together, forming a circle.
In practice, this would for example (but not necessarily) look like this, just to give an example:
Take the variation of the Big Bang theory where our universe starts with a Big Bang and ends with a Big Crunch. Take the moment of the Big Bang and the moment of the Big Crunch, and stitch them together, forming a circle.
This isn't the same as "the prior or next universe is identical to this one", because there is no prior or next universe. It means that there is only this universe and time goes in circle.
So this means that when we talk about the distant past, and when we talk about the distant future, we talk about the same moment in time.
(My personal opinion is that this picture is logical, and perfectly compatible with the underlying timelessness of the quantum realm. It is compatible with the "eternal now" that many traditions are talking about.)
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Which one is more likely to be the case? Or perhaps someone can refute one of these.
I'm addressing the everyday notion of time here. Past, present, future. Passage of time, arrow of time, flow of time etc.
(I'm aware that for example on the quantum level, or in many traditions, reality can also be understood to be timeless, that's not the aspect I'm addressing here.)
-------------------------
One-way-street time:
So we are born, we age, we die, and the world ages around us. Time and entropy always seem to flow in one direction. Time seems linear, an endless one-way-street, always flowing from the past towards the future.
The Bible also talks about "the beginning" and "end times", and so it is common to think of time as a one-way-street with a starting point and an ending point. According to the Bible, it's a finitely long one-way-street.
"Beginning" and "end" is discarded by many, but the underlying sensation of "one-way-street"-ness remains.
The Big Bang theory also usually implies that time is a one-way-street, with a beginning. That's where time started and there was no time before it. Some variations of it claim that the Big Bang was no beginning, and so the one-way-street continues further back, perhaps infinitely.
Some variations claim that the universe starts with a Big Bang and ends in a Big Crunch, and that's the start of the next universe. The next universe may be different or identical to this one. It's like an infinitely long chain of universes, where time still is a one-way-street.
(My personal opinion is that this picture is illogical, because finite things go on indefinitely.)
-------------------------
Circular time:
There's an alternative that may be counterintuitive and hard to grasp. Take a finitely long one-way-street time and stitch the two loose ends together, forming a circle.
In practice, this would for example (but not necessarily) look like this, just to give an example:
Take the variation of the Big Bang theory where our universe starts with a Big Bang and ends with a Big Crunch. Take the moment of the Big Bang and the moment of the Big Crunch, and stitch them together, forming a circle.
This isn't the same as "the prior or next universe is identical to this one", because there is no prior or next universe. It means that there is only this universe and time goes in circle.
So this means that when we talk about the distant past, and when we talk about the distant future, we talk about the same moment in time.
(My personal opinion is that this picture is logical, and perfectly compatible with the underlying timelessness of the quantum realm. It is compatible with the "eternal now" that many traditions are talking about.)
-------------------------
Which one is more likely to be the case? Or perhaps someone can refute one of these.