Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2008-03-28
JHEP0807:089,2008
Physics
High Energy Physics
High Energy Physics - Theory
24 pages, v2: minor corrections in the text and references added
Scientific paper
10.1088/1126-6708/2008/07/089
We propose several quark mass deformations of the holographic model of massless QCD using the D4/D8/D8bar brane configuration proposed by Sakai and Sugimoto. The deformations are based on introducing additional D4 or D6 branes away from the QCD D4 branes. The idea is similar to extended technicolor theories, where the chiral symmetry breaking by additional D-branes are mediated to QCD to induce non-zero quark masses. In the D-brane picture as well as the holographic dual gravity description, the quark and the pion masses are generated by novel worldsheet instantons with finite area. We also derive the Gell-Mann-Oakes-Renner relation, and find the value of the chiral condensate in the Sakai-Sugimoto model.
Hashimoto Katsumi
Hirayama Takayuki
Lin Feng-Li
Yee Ho-Ung
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