Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-10-05
Phys.Rev.D75:026002,2007
Physics
High Energy Physics
High Energy Physics - Theory
43 pages REVTeX and AMSLaTeX. v2: references added
Scientific paper
10.1103/PhysRevD.75.026002
We investigate backgrounds of Type IIB string theory with null singularities and their duals proposed in hep-th/0602107. The dual theory is a deformed N=4 Yang-Mills theory in 3+1 dimensions with couplings dependent on a light-like direction. We concentrate on backgrounds which become AdS_5 x S^5 at early and late times and where the string coupling is bounded, vanishing at the singularity. Our main conclusion is that in these cases the dual gauge theory is nonsingular. We show this by arguing that there exists a complete set of gauge invariant observables in the dual gauge theory whose correlation functions are nonsingular at all times. The two-point correlator for some operators calculated in the gauge theory does not agree with the result from the bulk supergravity solution. However, the bulk calculation is invalid near the singularity where corrections to the supergravity approximation become important. We also obtain pp-waves which are suitable Penrose limits of this general class of solutions, and construct the Matrix Membrane theory which describes these pp-wave backgrounds.
Das Sumit R.
Michelson Jeremy
Narayan K.
Trivedi Sandip P.
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