1993/12/17 by W. G. Unruh, Unruh, W. G.
Mathematics · Physics and Astronomy · #Algebraic and Geometric Analysis #Noncommutative and Quantum Gravity Theories #Quantum Mechanics and Applications #gr-qc
paper · pdf · doi:10.48550/arxiv.gr-qc/9312027
50 pages. This paper was presented to a conference entitled "Time's Arrow Today", a gathering of philosophers and physicists in 1992
arxiv created 1993/12/17 · arxiv updated 2009/11/30
Time plays different roles in quantum mechanics and gravity. These roles are examined and the problems that the conflict in the roles presents for quantum gravity are briefly summarised.