Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2001-02-26
Commun.Math.Phys.221:433-450,2001
Physics
High Energy Physics
High Energy Physics - Theory
Scientific paper
10.1007/s002200100481
We discuss instantons on noncommutative four-dimensional Euclidean space. In commutative case one can consider instantons directly on Euclidean space, then we should restrict ourselves to the gauge fields that are gauge equivalent to the trivial field at infinity. However, technically it is more convenient to work on four-dimensional sphere. We will show that the situation in noncommutative case is quite similar. One can analyze instantons taking as a starting point the algebra of smooth functions vanishing at infinity, but it is convenient to add a unit element to this algebra (this corresponds to a transition to a sphere at the level of topology). Our approach is more rigorous than previous considerations ; it seems that it is also simpler and more transparent. In particular, we obtain the ADHM equations in a very simple way.
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