learningphysics said:
Perhaps we have no disagreement at all. Yes, I believe space and time are the forms of our experience, and do not exist in and of themselves. But I'd never say they do not exist period. In fact the existence of space and time as the "forms of our experience" are two of the very few things we can be certain exist.
I think you're right about this. It doesn't really make sense to say that something which is only a concept does not exist, since clearly the person saying that it does not exist has a concept of it, and that's exactly what they're saying that it is, a concept, so it does exist.
It seems to make more sense to say that time is epiphemomenal rather than that it does not exist. It certainly exists in that it appears to exist for us as ordinary human beings, but does not exist when seen from a fundamental perspective, has no ontological foundation.
As far as I know the Wheeler-Feynman 'absorber theory' is still representative of the scientific view of time. Whether it is true or false it at least seems to model the behaviour of quantum entities in a way that is consistent with experimental evidence.
This theory models the universe in a way that has two possible interpretations, or so it seems to me. In one interpretation the universe is a set of events separated in time. There is a past, a present and a future, and advanced and retarded waves travel backwards and forwards in time. The other intepretation, counterintuitive though it may be, is that everything happens at once and time is an illusion.
In other words, it seems to me that in the same way that Billy T took the 't' out of the original (pendulum) equations it is possible to take the 't' out of the W-F absorber theory of time. Anyway, see what you think, I've posted an outline of the theory below.
Just before that though I should mention that proofs of the epiphenomenal nature of time were being written thousands of years ago by Buddhists and the like, and they continue to write them. Often they take the form of noting that nothing exists in the past, then noting that nothing exists in the future, and then, by the use of some equivalent of the 'Dedekind Cut' argument, the implausibility of the idea of a present 'instant' between them is shown.
As someone said above the problem with this idea, that time is illusory, is that our concepts of things like mass and energy (never mind life and death!) are time based. Take away time and mass/energy, as we think of it, cannot exist. I don't know how this paradox can be solved in physics, but in this other view the 'non-existence' of time does not give rise to paradoxes because in this view nothing happens. That is, on close analysis every phenomenon except one turns out to be an epiphenomenon, and therefore all events involving ephenomena are epiphenomal. I think I'm right in saying that this is more or less equivalent to a common scientific view in which the universe exists as dynamics and not as substance.
Anyway - here's a bit on the W-T theory in case you don't already know it.
"In the revised version of the ‘Wheeler-Feynman absorber theory’ … when an electron jiggles about it sends both a retarded wave into the future and an advanced wave into the past. Wherever in the Universe (in space and time) this wave meets another electron (strictly speaking, whenever it meets any charged particle), it makes the other electron jiggle about. This jiggling means that the other electron also radiates, both into the future and into the past. The result is an overlapping sea of interacting electromagnetic waves, filling the entire Universe, as a result of a single electron jiggling about. Most of these waves cancel out, just as the probabilities largely cancel out in the quantum description of reflection. But some of those waves, from both past and future, return to the original electron, and provide the resistance needed to explain observations of the way accelerated electrons behave.
… The great beauty about this, though, is that as far as the original electron is concerned the reaction is instantaneous. Some of it comes as a result of waves from the electron traveling into the future and generating waves which travel back into the past to arrive at the right time; some of it comes from the waves that travel into the past and generate waves which then travel back to the future. But in every case, since according to clock sitting next to the electron (or, indeed, any other clock) the time spent going forwards in time is the same as the time spent going backwards in time, the distance the waves have traveled doesn’t matter.
… The Wheeler-Feynman idea stands as the best explanation of why radiation resistance occurs and how photons are exchanged between charged particles… "
… Curiously, this means that in a sense the ancients were right - your eyes do emit photons, as part of an exchange with the photons radiated by a source of light; but like the paths involving photons bouncing at crazy angles off a mirror, they do not show up in the everyday world because of the way the probabilities cancel out. … time has no meaning for a photon, and all we can say is that photons have been exchanged between the source of light and our eyes (or whatever)."
… as a result of all these interactions, each individual charged particle - including each electron - is instantaneously aware of its position in relation to all the other charged particles in the Universe. The one tangible influence of the waves that travel backwards in time (the ‘advanced’ waves) is that they provide feedback which makes every charged particle an integrated part of the whole electromagnetic web. Poke an electron in a laboratory here on Earth, and in principle every charged particle in, say, the Andromeda galaxy, more than two million light years away, immediately knows what has happened, even though any retarded wave produced by poking the electron here on Earth will take more than two million years to reach the Andromeda galaxy. "
John Gribben
Schrödingers Kittens
and the Search for Reality
Phoenix, London 1995 (p 104-107)