Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2000-06-13
Nucl.Phys.B589:461-474,2000
Physics
High Energy Physics
High Energy Physics - Theory
17 pages; considerations about fermions added and some minor changes
Scientific paper
10.1016/S0550-3213(00)00527-7
We study the generalization of noncommutative gauge theories to the case of orthogonal and symplectic groups. We find out that this is possible, since we are allowed to define orthogonal and symplectic subgroups of noncommutative unitary gauge transformations even though the gauge potentials and gauge transformations are not valued in the orthogonal and symplectic subalgebras of the Lie algebra of antihermitean matrices. Our construction relies on an antiautomorphism of the basic noncommutative algebra of functions which generalizes the charge conjugation operator of ordinary field theory. We show that the corresponding noncommutative picture from low energy string theory is obtained via orientifold projection in the presence of a non-trivial NSNS B-field.
Bonora Loriano
Schnabl Martin
Sheikh-Jabbari Mohammad M.
Tomasiello Alessandro
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