How do particles arise in quantum field theories? The concept of particles is examined, and
is related to specific forms for the interaction between the field and other localised forms of …

It is argued that the affine structure of spacetime can be operationally defined only in
classical mechanics. The behaviour of free quantum particles, or subject only to gravity …

Quantum theory, like Hamiltonian or Lagrangian classical mechanics, 1 is not a concrete
theory like general relativity or electromagnetism, but a framework theory in which a great …

From the inception of quantum mechanics the theory has appeared to pose a dilemma about
its use of wave and particle concepts. At times the theory characterizes its subject matter in …

The physical, mathematical, and philosophical foundations of the quantum theory of free
Bose fields in fixed general relativistic spacetimes are examined. It is argued that the theory …

Most philosophical discussion of the particle concept that is afforded by quantum field theory
has focused on free systems. This paper is devoted to a systematic investigation of whether …

An interpretation and re-formulation of modern physics which removes the presumption of
the space-time continuum, and bases physical theory on a small number of rational and …

The combination of quantum mechanics and quantum? eld theory cons-
tutesthemostrevolutionaryandin? uentialphysicaltheoryofthetwentieth century …

In a unitary field theory particles appear not as singularities but as small volumes in which
energy and charge of the field are concentrated. In a theory of this nature, which is …

In the usual description of space and time, particles are represented by continuous world
lines. We replace these world lines by discrete rows of points, obtaining a locally finite …