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Dec
13
asked Does reflected light change LED power consumption?
Nov
30
revised QFT propagator, time reversal and the Born rule
added 53 characters in body
Nov
30
revised QFT propagator, time reversal and the Born rule
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Nov
30
comment QFT propagator, time reversal and the Born rule
I shouldn't have expressed my argument in terms of energy flow. Please see my Addenda for a more careful argument that respects the fact that the virtual particles themselves do not have a definite energy-momentum.
Nov
30
revised QFT propagator, time reversal and the Born rule
deleted 14 characters in body
Nov
30
comment QFT propagator, time reversal and the Born rule
But in the standard QFT formalism one only considers time-ordered propagators that propagate from early events to later events. In order to take the time-reversed propagators into account one needs to multiply by the complex conjugate of the entire scattering process in just the same way as one does when one follows the Born rule to calculate the scattering probabilities.
Nov
30
revised QFT propagator, time reversal and the Born rule
added 23 characters in body
Nov
30
revised QFT propagator, time reversal and the Born rule
added 303 characters in body
Nov
30
revised QFT propagator, time reversal and the Born rule
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Nov
30
revised QFT propagator, time reversal and the Born rule
added 278 characters in body
Nov
30
asked QFT propagator, time reversal and the Born rule
Nov
24
comment Electromagnetic field or direct interactions between charged particles?
As the volume $V$ shrinks then the Maxwell stress tensor term must increase to balance the loss of EM momentum from the second term. I'm not concerned with what happens at the limit when the volume is zero. All I want to assert is that at some point the EM momentum term is negligible compared to the Maxwell stress tensor term.
Nov
24
comment Electromagnetic field or direct interactions between charged particles?
$$\mathbf{F}=\int_S \mathbf{\overset{\leftrightarrow}{T}}\cdot d\mathbf{S}-\epsilon_0\frac{\partial}{\partial t}\int_V\mathbf{E}\times\mathbf{B}\ dV$$
Nov
24
revised Electromagnetic field or direct interactions between charged particles?
added 209 characters in body
Nov
23
comment Electromagnetic field or direct interactions between charged particles?
So if all electromagnetic interactions between charged particles are mediated by virtual photons transferring energy-momentum from one particle to another then one doesn't need electromagnetic fields.
Nov
23
revised Electromagnetic field or direct interactions between charged particles?
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Nov
23
revised Electromagnetic field or direct interactions between charged particles?
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Nov
23
revised Electromagnetic field or direct interactions between charged particles?
added 49 characters in body
Nov
23
revised Electromagnetic field or direct interactions between charged particles?
added 6 characters in body
Nov
23
revised Electromagnetic field or direct interactions between charged particles?
added 42 characters in body