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Nov 9 at 15:19 comment added Yang Xiaosheng A good answer is already there, but my two cents: it's probably just unnecessary words distracting readers from the main idea. From the context, the point might only be "$E=mc^2$ allowing creation and single-particle assumption does not hold". However, the particle-antiparticle pair production is fun and common, so they chose to write it down. Knowing the multi-particle possibility in relativistic cases should be enough.
Nov 8 at 17:07 comment added my2cts I don’t understand the statement in Peskin. $E=mc^2$ also allows for the creation of particle-particle pairs etc etc.
Nov 6 at 22:12 vote accept rithika
Nov 6 at 20:45 history edited Qmechanic CC BY-SA 4.0
added 10 characters in body; edited tags; edited title
Nov 6 at 20:34 answer added Andrew timeline score: 9
S Nov 6 at 20:23 review First questions
Nov 6 at 20:47
S Nov 6 at 20:23 history asked rithika CC BY-SA 4.0