# Instanton effects on condensates: (pseudo)scalars, (pseudo)vectors, tensor

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I have heard that the instanton effect in quark matter causes the di-quark condensate to be Lorentz scalar. As opposed to the Lorentz scalar, there are possibilities that the condensates are Lorentz pseudoscalars, Lorentz vectors, Lorentz pseudovectors, or Lorentz tensors. It could also possibly break the Lorentz symmetry.

So what is the physical intuition or math reasoning behind that instanton effect favor Lorentz scalar, but does not favor (pseudoscalars) that breaks parity $P$? How about other cases?

This post imported from StackExchange Physics at 2020-10-29 11:44 (UTC), posted by SE-user annie marie heart
asked Sep 25, 2017
What do you understand by the "di-quark condensate"?

This post imported from StackExchange Physics at 2020-10-29 11:44 (UTC), posted by SE-user Name YYY
It could be $<qq>, <\bar{q}q>$ and there are issues of their quantum numbers, such as spin $s$, angular momentum $L$, charge, color, parity, Lorentz [(pseudo)scalars, (pseudo)vectors, tensor], etc.

This post imported from StackExchange Physics at 2020-10-29 11:44 (UTC), posted by SE-user annie marie heart
By di-quark condensate, usually people mean $<qq>$. People may call $<q¯q>$ as anti-quark-quark condensate.

This post imported from StackExchange Physics at 2020-10-29 11:44 (UTC), posted by SE-user annie marie heart
You, of course, don't mean the realistic QCD quark condensate causing the SSB in the QCD, right?

This post imported from StackExchange Physics at 2020-10-29 11:44 (UTC), posted by SE-user Name YYY
$<q¯q> \neq 0$ in chiral symmetry breaking. $<qq> \neq 0$ in superconducting phase. I am talking about the superconducting phase.

This post imported from StackExchange Physics at 2020-10-29 11:44 (UTC), posted by SE-user annie marie heart
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