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Paper detail

Understanding the Aoki phase

The vacuum structure of QCD with two degenerated flavours of Wilson fermions is discussed by means of the p.d.f. (probability distribution function) formalism. Under certain assumptions, either new phases related to Aoki's appear, characterized by a non-vanishing expectation value of the condensate $i\barψ_uγ_5ψ_u + i\barψ_dγ_5ψ_d$, enriching the standard picture of the QCD vacuum structure with Wilson fermions; or the eigenvalues of the Dirac-Wilson operator must comply with a non-trivial, infinite set of sum rules, enforcing the currently accepted structure of the Aoki vacuum. The same scenario is analyzed using the Ginsparg-Wilson regularization. In this case, the absence of any parity and/or flavour breaking phase is proved for a non-zero value of the fermion mass.

preprint2009arXivOpen access
V. AzcoitiG. Di CarloE. FollanaA. Vaquero
hep-lat
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V. AzcoitiG. Di CarloE. FollanaA. Vaquero

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