Superconformal Algebras and Mock Theta Functions

Details Superconformal Algebras and Mock Theta Functions Superconformal Algebras and Mock Theta Functions

2008-12-05

arxiv.org/abs/0812.1151v2

J.Phys.A42:304010,2009

Physics

Mathematical Physics

28 pages

Scientific paper

10.1088/1751-8113/42/30/304010

It is known that characters of BPS representations of extended superconformal algebras do not have good modular properties due to extra singular vectors coming from the BPS condition. In order to improve their modular properties we apply the method of Zwegers which has recently been developed to analyze modular properties of mock theta functions. We consider the case of N=4 superconformal algebra at general levels and obtain the decomposition of characters of BPS representations into a sum of simple Jacobi forms and an infinite series of non-BPS representations. We apply our method to study elliptic genera of hyper-Kahler manifolds in higher dimensions. In particular we determine the elliptic genera in the case of complex 4 dimensions of the Hilbert scheme of points on K3 surfaces K^{[2]} and complex tori A^{[[3]]}.

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