| Literature DB >> 25814881 |
Brando Bellazzini1, Csaba Csáki2, Jay Hubisz3, Javi Serra2, John Terning4.
Abstract
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 [Formula: see text] 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 [Formula: see text]. At the same time the cosmological constant in this sector is also suppressed by [Formula: see text], and thus it is 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.Entities:
Year: 2014 PMID: 25814881 PMCID: PMC4371095 DOI: 10.1140/epjc/s10052-014-2790-x
Source DB: PubMed Journal: Eur Phys J C Part Fields ISSN: 1434-6044 Impact factor: 4.590
Fig. 1Pictorial representation of the tuned scenario with vanishing quartic in the absence of stabilizing perturbation (left) versus the proposal discussed in this work, where a large perturbation compensates for the large initial quartic (right)
Fig. 2Left Bulk scalar profile: (solid black), (dashed red), and (dotted blue). Right Effective AdS curvature, : same color code
Fig. 3The plot of the effective dilaton potential Eq. (5.19) for the parameters , , , , , and , all of them in units . The plot in the right is a zoom of the region where the minimum of the potential is