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I love this explanation because when I started thinking of it this way it blew my mind in ways that no other physics concept has. It's something that truly sou
by radarsat1 8y ago
I love this explanation because when I started thinking of it this way it blew my mind in ways that no other physics concept has. It's something that truly sounds crazy except that as far as I know it is a valid interpretation. (Layman here.)
We think of time being this thing that just moves forward around us, and we can't stop it, time just goes.
But in this interpretation, it's us who are falling through time, literally.
I find that fascinating because it changes entirely how I think about the universe. I used to think of the "big bang" as a big explosion of little balls of energy (quarks, electrons, whatever) that eventually coalesced into matter, when enough time had passed and there was enough room for things to cool down. The part that I never understood before this interpretation is how "enough time could pass", when time itself was also supposedly expanding.
But in fact with this interpretation, which I guess is probably more correct (?), space and time simply exploded and began expanding.. which is what we're told but it's hard to picture, exactly. But if you think about energy always moving at the speed of light, and initially all of it flying off in the same direction (time), then matter becomes those particles which were somehow slightly diverted onto the spatial axes -- momentum is conserved, just redirected. And if you think about particles being ripples in fields of non-zero constant energy, an interactions between the fields causing ripples to bump away from each other in non-time directions which we describe as space, this whole relativity thing, and the fact that electric field particles (photons) do not have mass and move at c, starts to make a bit of sense.
It's crazy to think that what we perceive as time passing, the very possibility of things happening, is actually an emergent property of simple geometry and interactions of pure energy.
The way I visualize it is: start two marbles rolling towards each other down an inclined slope. They bump, and bounce off in opposite directions on the X axis. Now imagine there is no table. Would the marbles "feel" anything in the vertical direction? Or would they only feel something in the horizontal direction? Time, for them, emerges from the fact that they can get closer, bump, and move off in the other direction. The other axis, which they are both moving very quickly in, they have entirely in common and they might agree with each other that it is simply a stationary frame which allowed the "bump" to happen. Same for us falling, unrelentingly and unstoppably, through time. (Maybe?)
- TeMPOraL 8y agoExcept mass/energy must be really drawing a line across time dimension, instead of being points in it, right? Otherwise anything traveling in space - and thus slightly sideways - would immediately desync with the universe around it and interact only with emptiness?