F. Antonuccio et al., DLCQ bound states of N=(2,2) super-Yang-Mills theory at finite and large N- art. no. 125006, PHYS REV D, 5812(12), 1998, pp. 5006
We consider the (1 + 1-dimensional N=(2,2) supersymmetric matrix model whic
h is obtained by dimensionally reducing N=1 super Yang-Mills theory from fo
ur to two dimensions. The gauge groups we consider are U(N) and SU(N), when
N is finite but arbitrary. We adopt light-cone coordinates, and choose to
work in the light-cone gauge. Quantizing this theory via discretized light-
cone quantization (DLCQ introduces an integer K which restricts the light-c
one momentum-fraction of constituent quanta to be integer multiples of 1/K.
Solutions to the DLCQ bound state equations are obtained for 2 less than o
r equal to K less than or equal to 6 by discretizing the light-cone superch
arges, which results in a supersymmetric spectrum. Our numerical results im
ply the existence of normalizable massless states in the continuum limit K-
->infinity, and therefore the absence of a mass gap. The low energy spectru
m is dominated by string-like (or many parton) states. Our results are cons
istent with the claim that the theory is in a screening phase. [S0556-2821
(98)04624-4].