Two-Point Stress-Tensor Correlator in N=1 SYM(2+1)

Details Two-Point Stress-Tensor Correlator in N=1 SYM(2+1) Two-Point Stress-Tensor Correlator in N=1 SYM(2+1)

2001-01-17

arxiv.org/abs/hep-th/0101120v1

Phys.Rev. D63 (2001) 105017

Physics

High Energy Physics

High Energy Physics - Theory

16 pp., 9 figures

Scientific paper

10.1103/PhysRevD.63.105017

Recent advances in string theory have highlighted the need for reliable numerical methods to calculate correlators at strong coupling in supersymmetric theories. We present a calculation of the correlator <0|T^{++}(r)T^{++}(0)|0> in N=1 SYM theory in 2+1 dimensions. The numerical method we use is supersymmetric discrete light-cone quantization (SDLCQ), which preserves the supersymmetry at every order of the approximation and treats fermions and bosons on the same footing. This calculation is done at large $N_c$. For small and intermediate r the correlator converges rapidly for all couplings. At small r the correlator behaves like 1/r^6, as expected from conformal field theory. At large r the correlator is dominated by the BPS states of the theory. There is, however, a critical value of the coupling where the large-r correlator goes to zero, suggesting that the large-r correlator can only be trusted to some finite coupling which depends on the transverse resolution. We find that this critical coupling grows linearly with the square root of the transverse momentum resolution.

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