Addressing a variety of theoretical cosmological problems, and emphasizing a mathematical approach, this volume nicely complements Peebles' "Physical Cosmology" (Princeton Series in Physics, 1971).… Expand

Abstract Twistor theory offers a new approach, starting with conformally-invariant concepts, to the synthesis of quantum theory and relativity. Twistors for flat space-time are the SU(2,2) spinors of… Expand

Einstein's field equations are studied under the assumptions that (1) the source of the gravitational field is a perfect fluid, and (2) there exists a group of motions simply transitive on… Expand

Part I. Einstein's Triumph: 1. 100 years of general relativity George F. R. Ellis 2. Was Einstein right? Clifford M. Will 3. Cosmology David Wands, Misao Sasaki, Eiichiro Komatsu, Roy Maartens and… Expand