6. Consider a particle with four-momentum $P^\mu P_\mu = M^2c^2 > 0$. Show that there always is a physical inertial frame where the spatial components of the four-momentum will vanish. This is called the center-of-momentum frame.
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The four-momentum of a particle is defined as P = (E/c, p), where E is the energy of the particle, c is the speed of light, and p is the momentum of the particle. Show more…
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