Arrow of Time
in [Relativity]
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From: Yousuf Khan on 21 Jun 2010 06:44 On 6/20/2010 9:14 AM, Sam wrote: > On Jun 19, 1:58 pm, bert<herbertglazie...(a)msn.com> wrote: >> >> Sam Time has 5 arrows TreBert > > 3.1 The thermodynamic arrow of time > 3.2 The cosmological arrow of time > 3.3 The radiative arrow of time > 3.4 The causal arrow of time > 3.5 The particle physics (weak) arrow of time > 3.6 The quantum arrow of time > 3.7 The psychological/perceptual arrow of time As far as I'm concerned, the thermodynamic, cosmological, radiative, causal and psychological/perceptual arrows of time are all the same thing: basically the causal arrow of time. It's the quantum and particle physics arrows that are slightly different. The quantum arrow probably represents what the universe was like before the Big Bang. Particles would come together, and fall apart, and back again without any structures being built or accumulating. The Big Bang imparted a momentum in a specific direction of space, which we now call "causal" time, where particles travel in the same direction and eventually collide to form bonds, which form structures, which accumulate as they travel through time. The particle physics arrow of time is the weird half-way point between the quantum arrow and the causal arrow. The particle physics arrow describes the lowest level of particles at which we see a causal arrow emerge, i.e. within the kaons. If the direction of time were reversed, then we'd have a universe dominated by anti-matter, because 1% more kaons would decay into anti-matter over matter, rather than the other way around. But we'd still see causality progress the same way. Also we'd likely have renamed anti-matter into matter, and vice-versa. Yousuf Khan
From: Don Stockbauer on 21 Jun 2010 09:08 On Jun 21, 5:44 am, Yousuf Khan <bbb...(a)spammenot.yahoo.com> wrote: > On 6/20/2010 9:14 AM, Sam wrote: > > > On Jun 19, 1:58 pm, bert<herbertglazie...(a)msn.com> wrote: > > >> Sam Time has 5 arrows TreBert > > > 3.1 The thermodynamic arrow of time > > 3.2 The cosmological arrow of time > > 3.3 The radiative arrow of time > > 3.4 The causal arrow of time > > 3.5 The particle physics (weak) arrow of time > > 3.6 The quantum arrow of time > > 3.7 The psychological/perceptual arrow of time > > As far as I'm concerned, the thermodynamic, cosmological, radiative, > causal and psychological/perceptual arrows of time are all the same > thing: basically the causal arrow of time. It's the quantum and particle > physics arrows that are slightly different. > > The quantum arrow probably represents what the universe was like before > the Big Bang. Particles would come together, and fall apart, and back > again without any structures being built or accumulating. The Big Bang > imparted a momentum in a specific direction of space, which we now call > "causal" time, where particles travel in the same direction and > eventually collide to form bonds, which form structures, which > accumulate as they travel through time. > > The particle physics arrow of time is the weird half-way point between > the quantum arrow and the causal arrow. The particle physics arrow > describes the lowest level of particles at which we see a causal arrow > emerge, i.e. within the kaons. If the direction of time were reversed, > then we'd have a universe dominated by anti-matter, because 1% more > kaons would decay into anti-matter over matter, rather than the other > way around. But we'd still see causality progress the same way. Also > we'd likely have renamed anti-matter into matter, and vice-versa. > > Yousuf Khan Little arrows in your clothing, little arrows in your hair. When you're in love you'll find those little arrows everywhere.
From: Robert L. Oldershaw on 23 Jun 2010 23:01 On Jun 21, 4:26 pm, Tom Roberts <tjroberts...(a)sbcglobal.net> wrote: > > If you don't believe me, just try to resolve the issue I brought > up earlier using any of those theories: what is the "cause" of > the fire on this match? ---------------------------------------------------------------- Well, for starters how about: motion, then friction, then heat, then chemical reactions, then fire? Are you saying that going from an unlit match to a flaming match is an ACAUSAL process? What exactly is your point? Can you specify any physical system undergoing any specific physical interaction that violates causality. Please skip the Platonic obfuscation and deal with real systems doing real testable things. RLO www.amherst.edu/~rloldershaw
From: bert on 24 Jun 2010 20:11 On Jun 21, 6:44 am, Yousuf Khan <bbb...(a)spammenot.yahoo.com> wrote: > On 6/20/2010 9:14 AM, Sam wrote: > > > On Jun 19, 1:58 pm, bert<herbertglazie...(a)msn.com> wrote: > > >> Sam Time has 5 arrows TreBert > > > 3.1 The thermodynamic arrow of time > > 3.2 The cosmological arrow of time > > 3.3 The radiative arrow of time > > 3.4 The causal arrow of time > > 3.5 The particle physics (weak) arrow of time > > 3.6 The quantum arrow of time > > 3.7 The psychological/perceptual arrow of time > > As far as I'm concerned, the thermodynamic, cosmological, radiative, > causal and psychological/perceptual arrows of time are all the same > thing: basically the causal arrow of time. It's the quantum and particle > physics arrows that are slightly different. > > The quantum arrow probably represents what the universe was like before > the Big Bang. Particles would come together, and fall apart, and back > again without any structures being built or accumulating. The Big Bang > imparted a momentum in a specific direction of space, which we now call > "causal" time, where particles travel in the same direction and > eventually collide to form bonds, which form structures, which > accumulate as they travel through time. > > The particle physics arrow of time is the weird half-way point between > the quantum arrow and the causal arrow. The particle physics arrow > describes the lowest level of particles at which we see a causal arrow > emerge, i.e. within the kaons. If the direction of time were reversed, > then we'd have a universe dominated by anti-matter, because 1% more > kaons would decay into anti-matter over matter, rather than the other > way around. But we'd still see causality progress the same way. Also > we'd likely have renamed anti-matter into matter, and vice-versa. > > Yousuf Khan Observers can have different perspectives of time. That has been confirmed. Best to keep in mind the effects of SR depends upon how fast one moves. We must always have "time dilation" and Lorentz contraction in our thinking Stuff is not "absolute" iF eINSTEIN DID not merge space and time I know I would have. They are two sides to the same coin. Always got a kick out of this fact. No matter how fast you chase after a light beam it still retreats from you at c Photons never change speed nor do they bounce. My "Spin is in theory" covers this. TreBert
From: Yousuf Khan on 25 Jun 2010 01:41
On 6/25/2010 6:11 AM, bert wrote: > Observers can have different perspectives of time. That has been > confirmed. Best to keep in mind the effects of SR depends upon how > fast one moves. We must always have "time dilation" and Lorentz > contraction in our thinking Stuff is not "absolute" iF eINSTEIN > DID not merge space and time I know I would have. They are two sides > to the same coin. Always got a kick out of this fact. No matter how > fast you chase after a light beam it still retreats from you at c > Photons never change speed nor do they bounce. My "Spin is in theory" > covers this. TreBert As far as I am concerned, the speed of light is simply the speed at which our universe itself is traveling through the time dimension. Anything that is traveling at the speed of light within the universe, is actually just running backwards to stay put in one spot in time, while the universe runs past it; like holding on for dear life onto the bank of a fast-moving river. That would also explain why causal time stops when traveling at exactly the speed of light. If everything traveled at the speed of light, then causality would stop because everything would stay put in their own given spots in time, neither advancing nor retreating. With no movement, no particles would be able to collide and therefore react to each other. If on the other hand, you were traveling at 99.9% the speed of light, then causal time will have slowed down considerably for you; but you are not yet at 100% light speed, so you will still experience reactions, albeit at a much reduced rate. That which we call time dilation is just fewer reactions occurring at a time. You need something traveling slight faster or slower through time to catch up with you and react with you. At 99.9% light speed, there is still a differential range of speeds of 0.1% light speed to play around in. Even if you were at 99.99% light speed, then you still have 0.01% to play around with. It's only when you get to a full 100% light speed that you got 0% differential to play with. Yousuf Khan |