Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2008-05-13
Class.Quant.Grav.25:195014,2008
Physics
High Energy Physics
High Energy Physics - Theory
21 pages + 14 pages app, add comments on susy and EM duality, add ref
Scientific paper
10.1088/0264-9381/25/19/195014
We describe a new class of boundary conditions for AdS_{d+1} under which the boundary metric becomes a dynamical field. The key technical point is to show that contributions from boundary counter-terms in the bulk gravitational action render such fluctuations normalizable. In the context of AdS/CFT, the analogue of Neumann boundary conditions for AdS promotes the CFT metric to a dynamical field but adds no explicit gravitational dynamics; the gravitational dynamics is just that induced by the conformal fields. Other AdS boundary conditions couple the CFT to a gravity theory of choice. We use this correspondence to briefly explore the coupled CFT + gravity theories and, in particular, for d=3 we show that coupling topologically massive gravity to a large N CFT preserves the perturbative stability of the theory with negative (3-dimensional) Newton's constant.
Compere Geoffrey
Marolf Don
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