Talks by Rodolfo Gambini

The Issue of Time in Generally Covariant Theories

Rodolfo Gambini Universidad de Montevideo
A possible solution of the problem of time in quantum gravitational systems is presented based on a relational description between the parameterized Dirac observables of the system under consideration and the clocks. The use of physical clocks required by a quantum gravitational description of time is shown to induce a loss of unitarity. The evolution is described by a Lindblad-type master equation unless it is possible to construct a perfect clock.