Lilia Anguelova, Peter Suranyi, L. C. Rohana Wijewardhana
We investigate the perturbative stability of a nonsupersymmetric D7 - anti-D7 brane embedding in a particular class of type IIB backgrounds. These backgrounds are the gravitational duals of certain strongly-coupled gauge theories, that exhibit a nearly conformal regime (known as a walking regime). Previous studies in the literature have led to conflicting results as to whether the spectrum of fluctuations around the flavor D7 - anti-D7 embedding has a tachyonic mode or not. Here we reconsider the problem with a new analytical method. Our analysis recovers the previously obtained numerical results and shows that there is no tachyonic mode for the phenomenologically relevant parameter range.
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http://arxiv.org/abs/1306.1981
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