# Spontaneous symmetry breaking by axions?

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I am just reading at the beginning of this nice article, that axions could be responsible for spontaneously breaking of a symmetry in the early universe.

Does anybody know which symmetry is alluded to and how the mechanism of spontaneous symmetry breaking exactly works in this particular case?

I apologize for not being able to better define the question, without having the answer ... :-/

This post imported from StackExchange Physics at 2014-03-09 16:17 (UCT), posted by SE-user Dilaton
The original axion model has a global $U(1)$ Peccei-Quinn symmetry which is spontaneously broken, but this has been ruled out. Nowadays people look at elaborated versions of the basic idea. A quick look at the Pospelov et al. preprint mentioned in the article shows they study a $Z_n$ invariant scalar. I'm really not very familiar with the details of these models though. PDG has a nice review.

This post imported from StackExchange Physics at 2014-03-09 16:17 (UCT), posted by SE-user Michael Brown
Thanks for these interesting links @MichaelBrown :-), the second one seems to adress another question I have concerning the article I linked too, namely how the domain walls separating areas with different values of the axion field can contribut to dark energy.

This post imported from StackExchange Physics at 2014-03-09 16:17 (UCT), posted by SE-user Dilaton
@MichaelBrown I guess, I would +1 your nice comment in the format of an answer too, just to say ;-)

This post imported from StackExchange Physics at 2014-03-09 16:17 (UCT), posted by SE-user Dilaton

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