Why is Symmetry Postulated in Quantum Field Theory and Particle Physics?

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In Quantum Field Theory and in particles physics, there's a postulate that is SIMMETRY. Why exists this postulate?

Best reggards.
 
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That's rather vague. You have to b more specific, in order to get a decent response.

Daniel.
 
Symmetry is not postulated; it is rather an observation of the world's workings. It's importance lies in the fact that whenever a symmetry is found, an associated conservation law can be found as well (see Noether's theorem http://en.wikipedia.org/wiki/Noether's_theorem)
 
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Raparicio said:
In Quantum Field Theory and in particles physics, there's a postulate that is SIMMETRY. Why exists this postulate?

Best reggards.
Symmetry is inherent to physical phenomena and nature in general.

marlon
 
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