1998/12/17 by Wu Zhong Chao
Physics and Astronomy · #gr-qc
published as Gen.Rel.Grav. 31 (1999) 1097-1103 · 8 pages
arxiv created 1998/12/17 · arxiv updated 2009/11/30
The seeds for quantum creations of universes are constrained gravitational instantons. For all compact constrained instantons with U(1) isometry, the period β of the group parameter τ is identified as the reciprocal of the temperature. If β remains a free parameter under the constraints, then the Euclidean action becomes the negative of the "entropy". As examples, we perform the calculations for the Taub-NUT and Taub-bolt-type models and study the quantum creation of the Taub-NUT universe.