teractions with the world. It is through our bodies that we undertake our daily activities, pursue our goals, and interact with each other. However, the body is not a mere vessel that houses the true self, but is constitutive of that self. Our physical bodies are crucial to how we see ourselves and how others see us. They are fundamental to our identities, where our bodies serve as a locus for ...

In this paper, we develop the quantum field theory of off-shell electromagnetism, and use it to calculate the Møller scattering cross-section. This calculation leads to qualitative deviations from the usual scattering cross-sections, which are, however, small effects, but may be visible at small angles near the forward direction.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..*................... 1 GENERAL INTRODUCTION ~.~O................................*............ 3 Part I: Confinement in Periodic Quantum Electrodynamics for Low Couplings

The simplest model in quantum optics deals with a single two-level atom interacting with a single mode of the radiation field. This ideal situation is implemented in Cavity Quantum Electrodynamics experiments, using high quality microwave or optical cavities as photon boxes. It provides a test bench for fundamental quantum processes and a promising ground for quantum information processing.

Electromagnetic waves are ideal candidates for transmitting information in a quantum network as they can be routed rapidly and efficiently between locations using optical fibres or microwave cables. Yet linking quantum-enabled devices with cables has proved difficult because most cavity or circuit quantum electrodynamics systems used in quantum information processing can only absorb and emit si...

3. Elementary processes in QED Scattering amplitudes and the differential cross-section Kinematics of binary processes, decay rate of an unstable particle The scattering e− e → μ− μ, the square of the scattering amplitude Unpolarized scattering and its differential cross-section The scattering e− μ− → e− μ−, the square of the scattering amplitude Crossing symmetry, Mandelstam variables, crossed...

The use of a fermion Green’s function involving no delta functions is demonstrated. This Green’s function is employed to compute the first order contribution to the vacuum polarization of the hydrogen Lamb shift. No infinities appear so that regularization is unnecessary. The numerical value of this contribution to the vacuum polarization is shown to be identical to the value obtained by regula...

We show that it is possible to obtain a realistic and deterministic model, based on a previous work of John Bell, which reproduces the experimental predictions of the orthodox interpretation of quantum electrodynamics. P.A.C.S.: 03.65.Ta; 03.70.+k

We employ the influence functional technique to trace out the photonic contribution from full quantum electrodynamics. The reduced density matrix propagator then is constructed for the electron field. We discuss the role of time-dependent renormalization in the propagator and focus our attention to the possibility of obtaining a dynamically induced superselection rule. As a final application of...