Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2002-09-19
J.Phys.A36:4207-4220,2003
Physics
High Energy Physics
High Energy Physics - Theory
15 pages, LaTeX; v.2: two references added, to appear in J.Phys.A
Scientific paper
10.1088/0305-4470/36/14/320
The Yang-Mills (YM) and self-dual Yang-Mills (SDYM) equations on the noncommutative Euclidean four-dimensional space are considered. We introduce an ansatz for a gauge potential reducing the noncommutative SDYM equations to a difference form of the Nahm equations. By constructing solutions to the difference Nahm equations, we obtain solutions of the noncommutative SDYM equations. They are noncommutative generalizations of the known solutions to the SDYM equations such as the Minkowski solution, the one-instanton solution and others. Using the noncommutative deformation of the Corrigan-Fairlie-'t Hooft-Wilzek ansatz, we reduce the noncommutative YM equations to equations on a scalar field which have meron solutions in the commutative limit and show that they have no such solutions in the noncommutative case. To overcome this difficulty, another ansatz reducing the noncommutative YM equations to a system of difference equations on matrix-valued functions is used. For self-dual configurations this system is reduced to the difference Nahm equations.
Franco-Sollova Filip
Ivanova Tatiana A.
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