A naturally light dilaton and a small cosmological constant

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• Brando Bellazzini
• Friday 17 January 2014, 16:00-17:00
• MR4, CMS, Wilberforce Road, Cambridge, CB3 0WB.

If you have a question about this talk, please contact Damien George.

I present a 5D holographic description of a conformal theory perturbed by a close-to-marginal operator of dimension 4-epsilon, which develops a condensate. As long as the dimension of the perturbing operator remains very close to marginal (even for large couplings) a stable minimum at hierarchically small scales is achieved, and the dilaton mass squared is suppressed by epsilon compared to the other KK modes. At the same time the dynamical contribution to the cosmological constant from the condensate is also suppressed by epsilon, and thus parametrically smaller than in a broken SUSY theory. As a byproduct I also present an exact solution to the scalar-gravity system that can be interpreted as a new holographic realization of spontaneously broken conformal symmetry. Even though this metric deviates substantially from AdS space in the deep IR it still describes a non-linearly realized exactly conformal theory.

This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.

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