Can high energy scattering produce reverse temporal momentum particles?

[Duda Jarek]

Particles are some solutions of the field localized in some three dimensions and long in the last one. They prefer their long dimension to be in interior of local light cones and so they don't like to turn back.

But in high energy scattering this restriction should be weakened.

 

Shouldn't high energy scattering produce some small amount of reverse temporal momentum particles?

From the perspective of our perception of time such particles would be produced before scattering, probably by the matter of detectors in accelerator.

In accelerators are used extremely sensitive detectors, but they are specialized in measuring absorbed particles - they could not spot that they themself emit a bit more particles than usual (just before the scattering).

 

Is such effect possible? Could we detect it?

If yes, it could lead to extremely powerful computers:

http://groups.google.com/group/sci.physics.foundations/browse_thread/thread/a236ada29c944ebb

 

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The first conclusion on another forum was that I'm talking about tachyons...

No - I'm not talking about FTL - it can be possible for huge energies, very small scales (inflation), but from our perspective these nonperturbative solutions are rather impossible for practical usage. About tachyons - waves which could travel out of the cone of usual interactions ... in my view of physics SRT doesn't forbid them. Generally I think we are far from proving that they exist or don't exist ...

 

I'm talking about something what shouldn't be controversial - particles produced in high energy scattering, which moves inside the light cone, but in reverse time direction.

It's reversed only from its point of view - from ours they've been produced for example by a matter of detectors and goes straight into the scattering point.

But from causality point of view, their production by the matter of a detector is caused by the scattering in what we call future.

[Severian]

Yes, they can, though one can show that these solutions are necessarily of negative energy. This has been known for a very long time, but the symmetries of the physics allow a reinterpretation of the backwards-in-time propagating particles - they are antiparticles moving forward in time. This is known as the Feynman-Stueckelberg interpretation (see the last paragraph of http://en.wikipedia.org/wiki/Antiparticle).

[Duda Jarek]

CPT symmetry conservation suggests that in high energy scatterings particles should be able to choose between both light cones - future and past.

We can call them virtual particles, that they have negative energy, because from our perspective of time it was the detector what emitted the particle which hit exactly into the scattering point.

 

So if we would observe precisely the matter near scattering, we should be able to observe small changes just BEFORE the scattering?

For example by using a mirror as the detector and analyze reflected low energy beam.

Now coupling it with something which for example could bend the beam to make it miss the target (avoid scattering), we would make causality loop, which should allow for time-loop computations...?

 

ps. Using magnetic field we could make that this 'virtual' particle would create a (spatial) loop, what should allow us to make the time difference (for classical computation) quite large.

Edited December 24, 2008 by Duda Jarek