Type IIB string theory on AdS_5 X T^{nn'}

TL;DR

This paper analyzes the Kaluza-Klein spectrum of type IIB string theory on AdS_5 x T^{nn'} and finds rational conformal dimensions and masses for certain modes, revealing connections to non-critical string theory.

Contribution

It provides a detailed study of the KK spectrum on AdS_5 x T^{nn'} and uncovers rational conformal dimensions and links to c=1 string theory cohomology classes.

Findings

Boundary operators have rational conformal dimensions.

Fermionic mode masses depend rationally on R charge.

Modes from q-forms relate to c=1 string cohomology.

Abstract

We study \kk spectrum of type IIB string theory compactified on $AdS_5 \times T^{nn'}$ in the context of $AdS/CFT$ correspondence. We examine some of the modes of the complexified 2 form potential as an example and show that for the states at the bottom of the \kk tower the corresponding $d=4$ boundary field operators have rational conformal dimensions. The masses of some of the fermionic modes in the bottom of each tower as functions of the $R$ charge in the boundary conformal theory are also rational. Furthermore the modes in the bottom of the towers originating from $q$ forms on $T^{11}$ can be put in correspondence with the BRS cohomology classes of the $c=1$ non critical string theory with ghost number $q$. However, a more detailed investigation is called for, to clarify further the relation of this supergravity background with the $c=1$ strings.