What is a leading order diagram?
you may hear of “leading order” (LO) – the diagram corresponding to the smallest order in couplings at which a process can occur, then next-to-leading (NLO) and N2 LO etc.
How did Feynman come up with Feynman diagrams?
III. Feynman started from scratch, drawing pictures whose stick-figure lines show links of influence between particles. The first published Feynman diagram appeared in Physical Review in 1949: Two electrons exchange a photon.
Can a proton travel back in time?
A tachyon is said to have greater than light speed velocity, and then it has according to special relativity faster than light backwards time travel. Every tachyon is then constantly traveling backwards in time.
Is electron a neutrino?
) is an elementary particle which has zero electric charge and a spin of 1⁄2. Together with the electron, it forms the first generation of leptons, hence the name electron neutrino….Electron neutrino.
| Composition | Elementary particle |
|---|---|
| Generation | First |
| Interactions | Weak, Gravity |
| Symbol | ν e |
| Antiparticle | Electron antineutrino ( ν e) |
What does a Feynman diagram show?
The lines in a Feynman diagram represent the probability amplitude for a particle to go from one place to another. In Feynman diagrams, the particles are allowed to go both forward and backward in time. When a particle is going backward in time, it is called an antiparticle.
Is retrocausality possible?
Although closed timelike curves do not appear to exist under normal conditions, extreme environments of spacetime, such as a traversable wormhole or the region near certain cosmic strings, may allow their formation, implying a theoretical possibility of retrocausality.
Who discovered Tachyons?
Tachyons were first introduced into physics by Gerald Feinberg, in his seminal paper “On the possibility of faster-than-light particles” [Phys. Rev. 159, 1089—1105 (1967)].
Do virtual particles have energy?
Virtual particles do not necessarily carry the same mass as the corresponding real particle, although they always conserve energy and momentum. The closer its characteristics come to those of ordinary particles, the longer the virtual particle exists.
What is quantum Retrocausal theory?
Retrocausal Quantum theory says time can flow backwards!! From what we commonly understand, time has one direction and that direction is forward; past, present, future. But physicists are playing with the theory of “retrocausality”, which if real, is the idea that the future can influence the past.