- #36
gptejms
- 386
- 2
marlon said:
Can you write down the propagator(math. expression) for Dirac field and then explain each term
marlon said:So basically a propagator expresses the probability that a particle with positive energy created in x' on t' will propagate to place x on time t. This is valid for t > t'. If t < t', then the propagator expresses the probability that a particle with negative energy created in x' on t' will propagate BACKWARDS in time to x on some time t. It is the SUM of both these probability-amplitudes that is relativistically invariant !
Particles and antiparticles are two types of subatomic particles that make up the building blocks of matter. They have the same mass and spin, but opposite electric charge and other quantum numbers.
Particles and antiparticles can be created through high-energy collisions, such as those that occur in particle accelerators. They can also be created through certain types of radioactive decay.
When a particle and antiparticle meet, they can annihilate each other, releasing energy in the form of gamma rays. This process is known as annihilation.
Particles and antiparticles play a crucial role in understanding the early universe and the processes that govern it. They also help explain the fundamental forces that govern the interactions between particles.
The main difference between matter and antimatter is that they have opposite charges. Matter is made up of particles with positive charges, while antimatter is made up of particles with negative charges. This difference is what allows them to annihilate each other when they come into contact.