Register to reply

CPT Symmetry

by Love*Physics
Tags: symmetry
Share this thread:
Jun1-08, 07:31 PM
P: 7
Is weak interaction invaraint under CPT Symmetry? Why?
Phys.Org News Partner Physics news on
UCI team is first to capture motion of single molecule in real time
And so they beat on, flagella against the cantilever
Tandem microwave destroys hazmat, disinfects
Jun1-08, 08:08 PM
Sci Advisor
P: 779
yes it is. it is a theorem that all quantum field theories that satisfy relatively weak conditions (locality, unitarity, S-matrix,...) are CPT-invariant. weak interactions are no exception. you can prove it by referring to that theorem, or by just brute-force transforming the action under CPT and seeing that it's invariant.
Jun2-08, 04:26 AM
P: 7
would you please expline further? How can I prove that?

Jun2-08, 05:21 AM
Sci Advisor
P: 1,689
CPT Symmetry

Proof of the CPT theorem is nontrivial and requires quite a bit of background. But it is a deep and important mathematical truism about quantum field theories.

There are various books that treat it in varying degrees of rigor. I think Weinberg proves it in his volumes, and for a more mathematical treatment see Streeter/Wightman.

Incidentally people look for violation of the CPT experimentally, so far without success. But it would be a big deal if one day such a fundamental symmetry was broken. It would mean probably that we would need to go back to Constructive field theories for insight.

Register to reply

Related Discussions
What is the difference between dynamical symmetry and geometrical symmetry? Classical Physics 5
What are symmetry and symmetry breaking? High Energy, Nuclear, Particle Physics 1
Symmetry and shape of elementary particles High Energy, Nuclear, Particle Physics 19
Gauge symmetry and symmetry breaking High Energy, Nuclear, Particle Physics 2
SU(3) symmetry of QCD High Energy, Nuclear, Particle Physics 20