Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2000-06-29
JHEP 0009:023,2000
Physics
High Energy Physics
High Energy Physics - Theory
16 pages, harvmac; v2: clarified the relation between the light-like D4 and M5 theories; references added
Scientific paper
10.1088/1126-6708/2000/09/023
We show that field theories with light-like noncommutativity, that is with $\theta^{0i}=-\theta^{1i}$, are unitary quantum theories, and that they can be obtained as decoupled field theory limits of string theory with D-branes in a background NS-NS $B$ field. For general noncommutativity parameters, we show that noncommutative field theories which are unitary can be obtained as decoupled field theory limits of string theory, while those that are not unitary cannot be obtained from string theory because massive open strings do not decouple. We study the different theories with light-like noncommutativity which arise from Type II D-branes. The decoupling limit of the D4-brane seems to lead to a noncommutative field theory deformation of the $(2,0)$ SCFT of M5-branes, while the D5-brane case leads to a noncommutative variation of ``little string theories''. We discuss the DLCQ description of these theories.
Aharony Ofer
Gomis Jaume
Mehen Thomas
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