6 papers
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.
Quantum Black Hole
Wu Zhong Chao
Creation of a black hole in quantum cosmology is the third way of black hole formation. In contrast to the gravitational collapse from a massive body in astrophysics or from the qu…
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…
Quantum Creation of a Black Hole
Wu Zhong Chao
Using the Hartle-Hawking no-boundary proposal for the wave function of the universe, we can study the wave function and probability of a single black hole created at the birth of t…
Quantum Fields in Schwarzschild-de Sitter Space
Wu Zhong Chao
In the No-Boundary Universe a primordial black hole is created from a constrained gravitational instanton. The black hole created is immersed in the de Sitter background with a pos…