Is quantum gravity deterministic and/or time symmetric?

Details Is quantum gravity deterministic and/or time symmetric? Is quantum gravity deterministic and/or time symmetric?

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gregr..14..299p&link_type=abstract

General Relativity and Gravitation, Volume 14, Issue 3, pp.299-302

Physics

31

Gravitation Theory

Scientific paper

S. W. Hawking suggests that quantum gravity introduces a new level of uncertainty into physics by turning pure states into mixed states. Although the evidence for this information loss is based upon a semiclassical approximation and hence is not conclusive, it is interesting to examine the implications. As originally formulated, Hawking's proposal violates CPT invariance by singling out one direction of time in which pure states turn into mixed states. An alternate hypothesis is suggested whereby the theory could be time symmetric and yet allow a loss of information. In this model the universe as a whole would be an open system, and even its density matrix would not have a deterministic evolution. The question remains of how much uncertainty there actually is in quantum gravity.

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