arXiv.org > hep-th > arXiv:1305.3919
A Naturally Light Dilaton and a
Small Cosmological Constant
B. Bellazzini, C. Csaki, J. Hubisz, J. Serra, J. Terning
(Submitted on 16 May 2013)
We present a non-supersymmetric theory with a
naturally light dilaton. It is based on 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, where the dilaton mass squared is suppressed by
epsilon. At the same time the cosmological constant in this sector
is also suppressed by epsilon, and thus parametrically smaller than
in a broken SUSY theory. As a byproduct we 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. We also display the effective potential
for the dilaton for arbitrary holographic backgrounds.