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Before electroweak symmetry breaking, there were massless particles. Can these massless particles be seen in terms of energy momentum relation ##E = ##c##p##?
The energy momentum of massless particles refers to the energy and momentum carried by particles that have no mass. This includes particles such as photons, gluons, and gravitons.
The main difference is that massless particles travel at the speed of light, while particles with mass have a slower speed. This means that the energy momentum of massless particles is solely determined by their frequency or wavelength, while particles with mass also have a contribution from their mass.
Yes, massless particles can have momentum, even though they have no mass. This is because momentum is a product of mass and velocity, and massless particles have a velocity of c, the speed of light.
The energy momentum of massless particles is typically measured through their interactions with other particles. For example, the energy of a photon can be measured by observing the effect it has on an electron, and the momentum can be calculated from the change in direction of the electron's path.
The energy momentum of massless particles is important in many areas of physics, including quantum mechanics, relativity, and particle physics. It helps us understand the behavior of massless particles and their interactions with other particles, and plays a crucial role in theories such as the Standard Model and quantum field theory.