This book concerns the foundations of Quantum Gravity, in particular from a conceptual point
of view. It provides a self-contained introduction to this topic, resting on particular features of …

This is the first in a series of papers aiming to develop a relativistic quantum information
theory in terms of unequal-time correlation functions in quantum field theory. In this work, we …

We employ the stochastic path-integral formalism and action principle for continuous
quantum measurements–the Chantasri–Dressel–Jordan (CDJ) action formalism Chantasri …

On the path towards quantum gravity we find friction between temporal relations in quantum
mechanics (QM)(where they are fixed and field-independent), and in general relativity …

Following the renewed interest in the topic [Halliwell and Yearsley, Phys. Rev. D 86, 024016
(2012) PRVDAQ 1550-7998], we revisit the problem of assigning probabilities to classes of …

The inherent difficulty in talking about quantum decoherence in the context of quantum
cosmology is that decoherence requires subsystems, and cosmology is the study of the …

We analyze time-of-arrival probability distributions for relativistic particles in the context of
quantum field theory (QFT). We show that QFT leads to a unique prediction, modulo post …

Starting from the canonical formalism of relativistic (timeless) quantum mechanics, the
formulation of a timeless path integral is rigorously derived. The transition amplitude is …

A local resolution to the Problem of Time that is Machian and was previously demonstrated
for relational mechanics models is here shown to work for a more widely studied quantum …

We consider a point particle in one dimension initially confined to a finite spatial region
whose state is frequently monitored by projection operators onto that region. In the limit of …