Lilia Anguelova, Peter Suranyi, L. C. Rohana Wijewardhana
We study the spectrum of scalar mesons in the holographic dual of walking technicolor, obtained by embedding D7 - anti-D7 probe branes in a certain type IIB background. The scalar mesons arise from fluctuations of the probe techniflavour branes and complement the (axial-)vector meson spectra that we investigated in earlier work. By explicitly finding the spectrum of scalar masses, we show that the nonsupersymmetric D7 - anti-D7 embedding is stable with respect to such fluctuations. Interestingly, it turns out that the mass splitting between the scalar and vector meson spectra is of subleading order in a small parameter expansion. It is noteworthy that this near-degeneracy is not directly due to a small amount of supersymmetry breaking and thus suggests the presence of some other (approximate) symmetry in the problem.
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http://arxiv.org/abs/1203.1968
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