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At some point between the source of a field and infinity the energy has to fall below a Planck limit where it will no longer be effective during interactions. The inverse square character of some fields can mean there is a range limit imposed on these fields. I may be very wrong on this point. Am I?

Quote from: jeffreyH on 07/12/2014 04:15:22At some point between the source of a field and infinity the energy has to fall below a Planck limit where it will no longer be effective during interactions. The inverse square character of some fields can mean there is a range limit imposed on these fields. I may be very wrong on this point. Am I?If I've understood what you mean, then you should talk of energy density, not energy.Anyway remember that classics electrodynamics has its limits and quantum electrodynamics instead come into play at low energy densities.--lightarrow

At some point between the source of a field and infinity the energy has to fall below a Planck limit where it will no longer be effective during interactions.

The inverse square character of some fields can mean there is a range limit imposed on these fields.

I may be very wrong on this point. Am I?

Yes I understand about the virtual photons. Within the future light cone there will be a drop in density. However uncertainty also comes into play. We could effectively end up with a force that can only move something 1 billionth or 1 trillionth of a Planck length per second. That surely will be ineffective and so can be ignored. This situation will occur before infinity as infinity is never reached.

Some good points.

Quote from: lightarrow on 07/12/2014 19:33:05Quote from: jeffreyH on 07/12/2014 04:15:22At some point between the source of a field and infinity the energy has to fall below a Planck limit where it will no longer be effective during interactions. The inverse square character of some fields can mean there is a range limit imposed on these fields. I may be very wrong on this point. Am I?If I've understood what you mean, then you should talk of energy density, not energy.Anyway remember that classics electrodynamics has its limits and quantum electrodynamics instead come into play at low energy densities.--lightarrowDensity is not quite the correct term.

Quote from: jeffreyH on 07/12/2014 22:46:52Yes I understand about the virtual photons. Within the future light cone there will be a drop in density. However uncertainty also comes into play. We could effectively end up with a force that can only move something 1 billionth or 1 trillionth of a Planck length per second. That surely will be ineffective and so can be ignored. This situation will occur before infinity as infinity is never reached.Jeff - You never answered my question, i.e. I don't know what you mean by a "Planck limit" so can you please explain what you mean by this in this context please? I have a feeling that you're talking about spatial distances where space gets foamy. If that's correct then it doesn't apply to this question.

That is what I meant but I have modified my opinion. I'm almost finished Lee Smolin's book which was very informative although it is 12 years old now. I have a much better understanding of string theory, quantum loop gravity and the holographic principle. You should read it. There is sparse mathematics in it but the principles are put across well.

Quote from: Ethos_Thanks Jeff and,.............. I would like to add, you ask some very intelligent questions.

I am interested in the philosophy, history and the biographies of the early pioneers. I have gone back as far as the histories of Tycho Brahe, Kepler and Newton. I have read the biography of Schrodinger and will try to read more on others in the future. You often have to review history to gain insight.