Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2003-04-16
Nucl.Phys.B664:247-275,2003
Physics
High Energy Physics
High Energy Physics - Theory
35 pages, harvmac; v2: references added
Scientific paper
10.1016/S0550-3213(03)00456-5
Following earlier work by Polyakov and Gubser, Klebanov and Polyakov, we attempt to clarify the structure of vertex operators representing string states which have large (``semiclassical'') values of AdS energy (equal to 4-d dimension \Delta) and angular momentum J in S^5 or spin S in AdS_5. We comment on the meaning of semiclassical limit in the context of \alpha' perturbative expansion for the 2-d anomalous dimensions of the corresponding vertex operators. We consider in detail the leading-order 1-loop renormalization of these operators in AdS_5 x S^5 sigma model (ignoring fermionic contributions). We find new examples of operators for which, as in the case considered in hep-th/0110196, the 1-loop anomalous dimension can be made small by tuning quantum numbers. We also comment on a possibility of deriving the semiclassical relation between \Delta and J or S from the marginality condition for the vertex operators, using a stationary phase approximation in the path integral expression for their 2-point correlator on a complex plane.
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