RT Journal Article T1 Integrability formulation and bäcklund-transformations for gravitational-fields with symmetries A1 Chinea Trujillo, Francisco Javier AB The Ernst equation for gravitational fields with a two-parameter isometry group is formulated as a vanishing-curvature condition on an SU(2) or SU(1,1) bundle, both in the elliptic and hyperbolic cases. Bäcklund transformations are introduced as a special case of gauge transformations, and strong Bäcklund transformations are obtained in that context. PB Amer Physical Soc SN 1550-7998 YR 1981 FD 1981 LK https://hdl.handle.net/20.500.14352/64980 UL https://hdl.handle.net/20.500.14352/64980 LA eng NO © American Physical Society DS Docta Complutense RD 6 jul 2025