Holographic walking technicolor and stability of techni-branes

Techni-fermions are added as stacks of D7-D7 techni-branes within the framework of a holographic technicolor model that has been proposed as a realization of walking technicolor. The stability of the embedding of these branes is determined. When a sufficiently low bulk cut-off is provided the fluctuations remain small. For a longer walking region, as would be required in any realistic model of electroweak symmetry breaking, a larger bulk cut-off is needed and in this case the oscillations destabilize. (C) 2013 Elsevier B.V. All rights reserved.