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SUMMARY: A naturally light dilaton and a small cosmological constant - Bra
 ndo Bellazzini
DTSTART:20140117T160000Z
DTEND:20140117T170000Z
UID:TALK49928@talks.cam.ac.uk
CONTACT:Damien George
DESCRIPTION:I present a 5D holographic description of a conformal theory p
 erturbed by a close-to-marginal operator of dimension 4-epsilon\, which de
 velops a condensate. As long as the dimension of the perturbing operator r
 emains 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 condensat
 e  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 rea
 lization of spontaneously broken conformal symmetry. Even though this metr
 ic deviates substantially from AdS space in the deep IR it still describes
  a non-linearly realized exactly conformal theory.
LOCATION:MR4\, CMS\, Wilberforce Road\, Cambridge\, CB3 0WB
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