Gravitational instantons and hyperbolic space

Abstract

We construct a degeneration of Hitchin's non-standard minitwistor spaces associated with toric gravitational instantons of type A${}_{\mathrm{odd}}$ to the minitwistor space of a simple hyperbolic orbifold. We show that the corresponding families of minitwistor lines also converge under this degeneration. Consequently, the associated non-standard Einstein--Weyl spaces converge to the hyperbolic orbifold.

26 pages