Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2010-09-28
JHEP 1012:004,2010
Physics
High Energy Physics
High Energy Physics - Theory
29 pages, 4 figures. v2: minor changes in the introduction section. to appear in JHEP
Scientific paper
10.1007/JHEP12(2010)004
We consider "Orientifold field theories", namely SU(N) gauge theories with Dirac fermions in the two-index representation at high temperature. When N is even these theories exhibit a spontaneously broken Z2 centre symmetry. We study aspects of the domain wall that interpolates between the two vacua of the theory. In particular we calculate its tension to two-loop order. We compare its tension to the corresponding domain wall in a SU(N) gauge theory with adjoint fermions and find an agreement at large-N, as expected from planar equivalence between the two theories. Moreover, we provide a non-perturbative proof for the coincidence of the tensions at large-N. We also discuss the vacuum structure of the theory when the fermion is given a large mass and argue that there exist N-2 metastable vacua. We calculate the lifetime of those vacua in the thin wall approximation.
Armoni Adi
Korthals Altes Chris P.
Patella Agostino
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