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Imaatfaal, you wrote "I don't believe there are any reactions/interactions that are not time reversible; ie which make just as much sense going in one direction as the other. " and I referred you too CPT (Charge, Parity, and Time Reversals). I gave you one example of it (weak nuclear force) but I expect there to be more to be found. It would be nice if the symmetry(ies) couldn't be questioned, but it/they can. That may mean that there are some deeper definition of it which must be symmetric, or it may be that what we see is a result of us living in a universe where most is arranged as a symmetry by 'chance/probability' although not coming out so at all times. I don't know, although I would really like to know what 'time' and its arrow really, and I do mean, R e a l l y, is/are myself?Spontaneous CPT asymmetry of the Universe (Free) CPT violation and particle-antiparticle asymmetry in cosmology. Just interesting
Quote from: MikeS on 07/02/2012 12:18:16Quote from: imatfaal on 07/02/2012 10:59:56 So yes you can ignore time dilation by either doing the experiment within the frame of the interaction or by compensating for frame differences. The time dilation does not affect the reaction - it affects the observation of it.Thinking about it, I believe you are wrong. It affects the amount of energy required to do the reaction and results in higher entropy.The time dilation factor does affect the reaction in as much as entropy increases at a higher rate in a greater time dilation than in a lesser one. You need more energy to do anything (including any chemical reaction, experiment etc.) in a greater time dilated (higher gravitational) potential than in a lower time dilated (lower gravitational) potential. This is the answer I was looking for but had as then not found in answer to Soul Surfer and JP earlier in this thread.Mike this is getting bizarre. Quote.... in a greater time dilated (higher gravitational) potential than in a lower time dilated (lower gravitational) potential. Even ignoring the claim about energy needed this sentence is wrong. gravitational potential goes up as you leave the gravity well of a massive body - clocks at a high gravitational potential run faster than those at a low gravitational potential. You are making claims of a subject you really do not understand.Please at least read the wikipage on this subject http://en.wikipedia.org/wiki/Gravitational_time_dilation
Quote from: imatfaal on 07/02/2012 10:59:56 So yes you can ignore time dilation by either doing the experiment within the frame of the interaction or by compensating for frame differences. The time dilation does not affect the reaction - it affects the observation of it.Thinking about it, I believe you are wrong. It affects the amount of energy required to do the reaction and results in higher entropy.The time dilation factor does affect the reaction in as much as entropy increases at a higher rate in a greater time dilation than in a lesser one. You need more energy to do anything (including any chemical reaction, experiment etc.) in a greater time dilated (higher gravitational) potential than in a lower time dilated (lower gravitational) potential. This is the answer I was looking for but had as then not found in answer to Soul Surfer and JP earlier in this thread.
So yes you can ignore time dilation by either doing the experiment within the frame of the interaction or by compensating for frame differences. The time dilation does not affect the reaction - it affects the observation of it.
.... in a greater time dilated (higher gravitational) potential than in a lower time dilated (lower gravitational) potential.
I believe, in the proverbial "closed system", radioactive decay must proceed in the direction of increasing entropy. You start with uranium and end up with lead, and that is independent of gravity. You can't go from lead to uranium without a low-entropy input from outside the system. In my own model, the direction of time is determined by the expansion of space, with alternate scale-wise universes running in alternate directions.
Quote from: Phractality on 14/02/2012 04:23:20I believe, in the proverbial "closed system", radioactive decay must proceed in the direction of increasing entropy. You start with uranium and end up with lead, and that is independent of gravity. You can't go from lead to uranium without a low-entropy input from outside the system. In my own model, the direction of time is determined by the expansion of space, with alternate scale-wise universes running in alternate directions. Nothing is independent of gravity and certainly nothing that has mass.
PhracRadioactive decay proceeds at a given rate. Therefore time plays a roll in the process and the time dilation factor is affected by the gravitational field.Presumably radioactive decay could be used as a clock. The time dilation factor of that clock will vary depending upon its hight within the gravitational gradient. So it would seem that gravity by affecting time dilation does play a part even at the nuclear level.
Quote from: MikeS on 28/02/2012 07:02:54PhracRadioactive decay proceeds at a given rate. Therefore time plays a roll in the process and the time dilation factor is affected by the gravitational field.Presumably radioactive decay could be used as a clock. The time dilation factor of that clock will vary depending upon its hight within the gravitational gradient. So it would seem that gravity by affecting time dilation does play a part even at the nuclear level.Where gravity does dilate time, yes; I believe it affects the rate of radioactive decay, but not the direction. I thought we were talking about absence of gravity, except, of course the gravity among nucleons of a single atom. It takes a lot of atoms to warp space-time significantly. Anyway, aren't we talking about the direction of time? Gravity dilates time; it doesn't affect the direction of time, at least not in Einstein's general relativity. I believe, when we get around to unifying GR with quantum mechanics, we're going to have to treat the nuclear forces in the same way that we treat gravity. At nuclear distances, the strong and weak forces (and perhaps the Higgs force) will warp space-time, but to a far greater extent than gravity does. A quark may resemble a tiny black hole, due to the way those forces warp space-time inside the subatomic particles. Outside the nucleus, those forces cancel each other out, so they don't warp space-time. I expect them to dilate time, also, but not alter its direction. In the absence of gravity other than that between nucleons of a single atom, without a major modification of GR, radioactive decay proceeds in the same direction as it does near a black hole. Inside a black hole, all bets are off. The one thing in my model that reverses the direction of time is scale, with many orders of magnitude defining the scales of successive universes. At present, there are roughly 59 orders of magnitude difference between our universe and the next larger-scale universe, and that number is increasing. Between our universe and the next smaller-scale universe, the scale factor is probably unknowable and decreasing from our point of view, while increasing from a sub-universe point of view.
An increase in gravitational strength dilates time. The EH of a black hole dilates time to the point where it (effectively) stops. Although the passage of time has stopped the arrow of time remains but the clock never ticks.
Quote from: MikeS on 02/03/2012 07:02:31An increase in gravitational strength dilates time. The EH of a black hole dilates time to the point where it (effectively) stops. Although the passage of time has stopped the arrow of time remains but the clock never ticks.imatfaal is probably going to point out that this is true only for a distant observer. For an observer in the EH (lets call him Fred), time passes as normal as perceived by him and recorded by his clock.Fred does not notice the slowing of time as perceived by a distant observer. As time stops so Fred's thought processes stop. Fred's watch stops.When Fred's watch stops, time really has stopped both for Fred and the distant observer.
Quote from: MikeS on 02/03/2012 07:20:50Quote from: MikeS on 02/03/2012 07:02:31An increase in gravitational strength dilates time. The EH of a black hole dilates time to the point where it (effectively) stops. Although the passage of time has stopped the arrow of time remains but the clock never ticks.imatfaal is probably going to point out that this is true only for a distant observer. For an observer in the EH (lets call him Fred), time passes as normal as perceived by him and recorded by his clock.Fred does not notice the slowing of time as perceived by a distant observer. As time stops so Fred's thought processes stop. Fred's watch stops.When Fred's watch stops, time really has stopped both for Fred and the distant observer.Because you post hundreds of messages on gravitational potential time dilation without understanding it. Fred will feel the pain as tidal forces rip him to pieces and we can only pray he is unconscious first; but he will not repeat NOT be insensible due to time slowing for him. He will know that it is slowing because the signals from his mate in the accelerated frame of reference will be more and more blueshifted - but he will not be able to sense it in his local frame. His mate will look at his signals and think that it is taking a huge time for his to cross the EH.And it is gravitational potential - not gravitational strength; there is a difference.You keep on about the arrow of time remaining - how do we test for that?