Monday, 30 January 2017

superconductivity - Quark pair superconductor: Even parity is favorred than odd parity


It seems that the quark pair superconductor can be odd or even parity pairing respect to the parity $P$.


Say that the even parity has the form: $$ \langle\psi C \gamma^5 \psi\rangle $$


the odd parity has the form: $$ \langle\psi C \psi\rangle $$ There is no difference at perturbative computation. $C$ is charge conjugate matrix.


But the literature seems to suggest that instanton effect favors the even parity not the odd parity. I look into the literature but the original paper seems not to assert that claim. Refs cited here


Do you have either a simple and intuitive or a rigorous analytic explanation of the claim?




No comments:

Post a Comment

Understanding Stagnation point in pitot fluid

What is stagnation point in fluid mechanics. At the open end of the pitot tube the velocity of the fluid becomes zero.But that should result...