Trying to understand (E2 - p2c2 = m2c2 )

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avery

I am trying to understand the following equation:

what is P?

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Nabeshin

p is the normal 3-momentum of the particle.

avery

Nabeshin said:

p is the normal 3-momentum of the particle.

thank you Nabeshin
if P is momentum of a particle that already exist
how can this equation explain the create of virtual particle from nothing?

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