Gravitation and Nonlocality

The physical basis of the standard theory of general relativity is examined and a nonlocal theory of accelerated observers is described that involves a natural generalization of the hypothesis of locality. The nonlocal theory is confronted with experiment via an indirect approach. The implications of the results for gravitation are briefly discussed.Comment: LaTeX file, no figures, 12 pages. To be published in: Proc. 25th Johns Hopkins Workshop "2001: A Relativistic Spacetime Odyssey" (World Scientific, Singapore

Nonlocal Electrodynamics of Accelerated Systems

Acceleration-induced nonlocality is discussed and a simple field theory of nonlocal electrodynamics is developed. The theory involves a pair of real parameters that are to be determined from observation. The implications of this theory for the phenomenon of helicity-rotation coupling are briefly examined.Comment: 10 page

On the spin-rotation-gravity coupling

The inertial and gravitational properties of intrinsic spin are discussed and some of the recent work in this area is briefly reviewed. The extension of relativistic wave equations to accelerated systems and gravitational fields is critically examined. A nonlocal theory of accelerated observers is presented and its predictions are compared with observation.Comment: LaTeX, 13 pages, no figures. Submitted to Hehl festschrift (GRG, to appear