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4 papers · 2 filters
On Fast Travel through spherically symmetric spacetimes
Belkis Cabrera Palmer, Donald Marolf
In a static spacetime, the Killing time can be used to measure the time required for signals or objects to propagate between two of its orbits. By further restricting to sphericall…
"Observables" in causal set cosmology
Graham Brightwell, H. Fay Dowker, Raquel S. Garcia +2
The ``generic'' family of classical sequential growth dynamics for causal sets provides cosmological models of causal sets which are a testing ground for ideas about the, as yet un…
Relativistic quantum measurement
Donald Marolf, Carlo Rovelli
Does the measurement of a quantum system necessarily break Lorentz invariance? We present a simple model of a detector that measures the spacetime localization of a relativistic pa…
General Covariance and the "Problem of Time" in a Discrete Cosmology
Graham Brightwell, H. Fay Dowker, Joe Henson +2
Identifying an appropriate set of ``observables'' is a nontrivial task for most approaches to quantum gravity. We describe how it may be accomplished in the context of a recently p…