### Wall-crossing, dilogarithm identities and the QK/HK correspondence

Persson, D *(Chalmers University of Technology)*

Friday 13 January 2012, 14:00-15:00

Seminar Room 1, Newton Institute

#### Abstract

I will explain how the wall-crossing behaviour of D-brane instantons in type II Calabi-Yau compactifications is captured by a certain hyperholomorphic line bundle over a hyperkähler manifold. This construction relies on a general duality between 4n-dimensional quaternion-Kähler and hyperkähler spaces with certain continuous isometries. The continuity of the moduli space metric across walls of marginal stability is encoded in non-trivial identities for the Rogers dilogarithm, which are shown to be a consequence of the motivic Kontsevich-Soibelman wall-crossing formula. Finally, I will offer some speculations on how the construction is modified in the presence of NS5-brane effects.

#### Presentation

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