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Quark mass and condensate in HQCD
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We extend the Sakai-Sugimoto holographic model of QCD (HQCD) by including the scalar bi-fundamental "tachyon" field in the 8-brane-anti-8-brane probe theory. We show that this field is responsible both for the spontaneous breaking of the chiral symmetry, and for the generation of (current algebra) quark masses, from the point of view of the bulk theory. As a by-product we show how this leads to the Gell-Mann- Oakes-Renner relation for the pion mass.
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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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