Abstract
It is shown that the Hartle-Hawking state of a scalar field is a maximum of entanglement entropy in the space of pure quantum states satisfying the condition that the back reaction be finite. In other words, the Hartle-Hawking state is a curved-space analogue of the EPR state, which is also a maximum of entanglement entropy.
- Received 2 April 1999
DOI:https://doi.org/10.1103/PhysRevD.61.064015
©2000 American Physical Society
