Mathematical and Quantum Aspects of Relativity and Cosmology : Proceeding of the Second Samos Meeting on Cosmology Geometry and Relativity Held at Pythagoreon Samos Greece 31 August–4 September 1998 This book is written in a pedagogical style intelligible for graduate students. It reviews recent progress in black hole and wormhole theory and in mathematical cosmology within the framework of Einsteins field equations and beyond including quantum effects. This collection of essays written by leading scientists of long standing reputation should become an indispensable source for future research