Can we observe FeynmanStueckelberg interpretation?by dudajar@gmail.com Tags: feynmanstueckelberg, interpretation, observe 
#1
Dec2608, 05:00 AM

P: n/a

We usually believe in CPT conservation, so if we imagine quarkgluon
soup, particles should be able to choose between future and past light cones to leave it. Such going backward in time particles were considered as Feynman Stueckelberg interpretation  they should have negative energy, so that going forward in time particles from this scattering would get more energy. If the scattering was in an accelerator, this particle would most probably hit some detector BEFORE the scattering. It agrees also from the perspective of our perception of time  this particle (now with positive energy) was produced by this detector before the scattering and goes straight into the scattering point, increasing the energy. Can such situation take place in reality? If yes the amount of such particles should be rather small  could we detect that detectors produced more particles than usually just before the scattering? Accelerators are full of extremely precise detectors, but they are specialized in detecting absorbed not produced particles. Such production could start some chemical processes, but they could be too slow and generally could be interpreted as some artifacts. Observe that such effect would create very nontrivial causality relation  we could use that physics should stabilize such causality loops to create extremely powerful computers: http://groups.google.com/group/sci.p...36ada29c944ebb  Moderator's note  The above description of the FeynmanStueckelberg trick is wrong. Indeed it contradicts its whole purpose, namely to give an interpretation for the quantumfield modes of negative frequency in relativistic QFTs. The correct interpretation is to interpret these modes as antiparticles with positive energies going in the opposite direction of momentum, leading to a creation operator for the corresponding physical state in the fundamental field operator. The whole point of relativistic QFT is that there are no states with negative energy (if the vacuum energy is normalized to 0 as usual). So particles with the behavior described in the above posting do not exist within the standard model of elementary particles which is based on local, microcausal QFTs with a stable ground (vacuum) state. 


#2
Dec2908, 05:00 AM

P: n/a

As I've read in Trevor Pitts article: "In the FeynmanStueckelberg
Interpretation, antimatter is identical to matter but moves backward in time". http://arxiv.org/html/physics/9812021v2 I think it's simplification: particles are some localized in 3 dimensions and long in the last one solutions of the field  they don't go forward/backward in time but just are some paths between two points in 4D spacetime. We have our subjective perception of direction of time, but it is the result of the boundary conditions with relatively small entropy (big bang). And so we choose the sign of energy (like psi(t)=exp(itH)psi (0)). What is less subjective is the causality: reasonresult chains. And CPT conservation suggests that such relations should be possible in both time directions.  Moderator's comment  The comment to the original posting still holds: There's nothing going backward in time in the FeynmanStueckelberg trick of local QFT. To the contrary, this interpretation of negativefrequency modes avoids entities running "backwards" in time. By construction, QFT is causal! 


#3
Dec3108, 05:00 AM

P: n/a

As I've read in Trevor Pitts article: "In the FeynmanStueckelberg
Interpretation, antimatter is identical to matter but moves backward in time". http://arxiv.org/html/physics/9812021v2 I think it's simplification: particles are some localized in 3 dimensions and long in the last one solutions of the field  they don't go forward/backward in time but just are some paths between two points in 4D spacetime. We have our subjective perception of direction of time, but it is the result of the boundary conditions with relatively small entropy (big bang). And so we choose the sign of energy (like psi(t)=exp(itH)psi (0)). What is less subjective is the causality: reasonresult chains. And CPT conservation suggests that such relations should be possible in both time directions.  Moderator's comment  The comment to the original posting still holds: There's nothing going backward in time in the FeynmanStueckelberg trick of local QFT. To the contrary, this interpretation of negativefrequency modes avoids entities running "backwards" in time. By construction, QFT is causal! 


#4
Dec3108, 05:00 AM

P: n/a

Can we observe FeynmanStueckelberg interpretation?
Thus spake dudajar@gmail.com
> Moderator's note  > >The above description of the FeynmanStueckelberg trick is wrong. >Indeed it contradicts its whole purpose, namely to give an >interpretation for the quantumfield modes of negative frequency in >relativistic QFTs. The correct interpretation is to interpret these >modes as antiparticles with positive energies going in the opposite >direction of momentum, leading to a creation operator for the >corresponding physical state in the fundamental field operator. I don't entirely agree with this. Clearly what we observe are positive energy antiparticles, but the FeynmanStueckelberg interpretation is that these are really negative energy particles going backwards in time. Hence the creation and annihilations processes are reversed. Of course, this is just interpretation, and makes absolutely no difference to the experimental predictions. Certainly we don't expect to observe any particular behaviour on account of this way of looking at qft. Regards  Charles Francis moderator sci.physics.foundations. charles (dot) e (dot) h (dot) francis (at) googlemail.com (remove spaces and braces) http://www.teleconnection.info/rqg/MainIndex 


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