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Chiral Dynamics From AdS Space
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We study the low energy dynamics of pions in a gravity dual of chiral symmetry breaking. The string theory construction consists of a probe D7 brane in the Constable Myers non-supersymmetric background, which has been shown to describe chiral symmetry breaking in the pattern of QCD. We expand the D7 brane's Dirac Born Infeld action for fluctuations that correspond to the Goldstone mode and show that they take the form of a non-linear chiral lagrangian. We numerically compute the quark condensate, pion decay constant and higher order Gasser Leutwyler coefficients. We find their form is consistent with naive dimensional analysis estimates. We also explore the gauging of the quark's chiral symmetries and the vector meson spectrum.
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Holographic analysis of near-conformal dynamics and light dilaton
In bottom-up holographic models of near-conformal gauge theories, a parametrically light dilaton exists only for nearly Neumann infrared boundary conditions, and this persists when a full ultraviolet RG flow is included.
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