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Unitarity and Causality in Generalized Quantum Mechanics for Non-Chronal Spacetimes
James B. Hartle
Spacetime must be foliable by spacelike surfaces for the quantum mechanics of matter fields to be formulated in terms of a unitarily evolving state vector defined on spacelike surf…
Time Symmetry and Asymmetry in Quantum Mechanics and Quantum Cosmology
Murray Gell-Mann, James B. Hartle
We investigate the origin of the arrow of time in quantum mechanics in the context of quantum cosmology. The ``Copenhagen'' quantum mechanics of measured subsystems incorporates a…
Spacetime Quantum Mechanics and the Quantum Mechanics of Spacetime
James B. Hartle
These are the author's lectures at the 1992 Les Houches Summer School, "Gravitation and Quantizations". They develop a generalized sum-over-histories quantum mechanics for quantum…
The Reduction of the State Vector and Limitations on Measurement in the Quantum Mechanics of Closed Systems
James B. Hartle
Measurement is a fundamental notion in the usual approximate quantum mechanics of measured subsystems. Probabilities are predicted for the outcomes of measurements. State vectors e…