Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2003-06-25
JHEP 0308 (2003) 057
Physics
High Energy Physics
High Energy Physics - Theory
17 pages, 8 figures, references added and corrected
Scientific paper
10.1088/1126-6708/2003/08/057
We introduce a finite dimensional matrix model approximation to the algebra of functions on a disc based on noncommutative geometry. The algebra is a subalgebra of the one characterizing the noncommutative plane with a * product and depends on two parameters N and theta. It is composed of functions which decay exponentially outside a disc. In the limit in which the size of the matrices goes to infinity and the noncommutativity parameter goes to zero the disc becomes sharper. We introduce a Laplacian defined on the whole algebra and calculate its eigenvalues. We also calculate the two--points correlation function for a free massless theory (Green's function). In both cases the agreement with the exact result on the disc is very good already for relatively small matrices. This opens up the possibility for the study of field theories on the disc with nonperturbative methods. The model contains edge states, a fact studied in a similar matrix model independently introduced by Balachandran, Gupta and Kurkcuoglu.
Lizzi Fedele
Vitale Patrizia
Zampini Alessandro
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