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5 papers · 2 filters
Entropy of Constrained Gravitational Instanton
Wu Zhong Chao
The seeds for quantum creations of universes are constrained gravitational instantons. For all compact constrained instantons with U(1) isometry, the period of the group parame…
Open and Closed Creations of Black Holes
Wu Zhong Chao
We study pair creation of Kerr-Newman-anti-de Sitter and Kerr-Newman-de Sitter black holes.
Pair Creation of Black Holes in Anti-de Sitter Space Background (I)
Wu Zhong Chao
For a spherically symmetric vacuum model with a negative cosmological constant, a complex constrained instanton is considered as the seed for the quantum pair creation of Schwarzsc…
Pair Creation of Black Hole in Anti-de Sitter Space Background
Wu Zhong Chao
In the absence of a general no-boundary proposal for open creation, the complex constrained instanton is used as the seed for the open pair creations of black holes in the Kerr-New…
Causality, Time Arrow and Half Cycling Universe
Wu Zhong Chao
If one introduces causality into quantum cosmology, then the prescription for the no-boundary universe should be revised. We show that the thermodymanic arrow of time associated wi…