The Symposium entitled: Causality and Locality in Modern Physics and As­ tronomy: Open Questions and Possible Solutions was held at York University, Toronto, during the last week of August 1997. It was a sequel to a similar sym­ posium entitled: The Present Status of the Quantum Theory of Light held at the same venue in August 1995. These symposia came about as a result of discussions between Professor Stanley Jeffers and colleagues on the International Organizing Committee. Professor Jeffers was the executive local organizer of the symposia. The 1997 symposium attracted over 120 participants representing 26 different countries and academic institutions. The broad theme of both symposia was the enigma of modern physics: the non-local, and possibly superluminal interactions implied by quantum mechanics, the structure of fundamental particles including the photon, the reconciliation of quantum mechanics with the theory of relativity, and the nature of gravity and inertia. Jean-Pierre Vigier was the guest of honour at both symposia. He was a lively contributor to the discussions of the presentations. The presentations were made as 30-minute lectures, or during an evening poster session. Some participants did not submit a written account of their presentation at the symposium, and not all of the articles submitted for the Proceedings could be included because of the publisher's page limit. The titles and authors of the papers that had to be excluded are listed in an appendix.

Possible Consequences of an Extended Charged Particle Model in Electromagnetic Theory.- Astrophysics-Cosmology.- The Origin of Cosmological Redshift in Spin Exchange Vacuum Compactification and Nonzero Rest Mass Photon Anisotropy.- Non-Locality, Complementarity and Cosmology.- The Planck Mass as a Fundamental Entity for Particle Structure and Cosmology.- Causality & Locality in Multiverse Solutions of the Einstein Equations.- Aharonov-Bohm Effect.- Proposal of a New Kind of Aharonov-Bohm Effect.- Generalized Aharonov-Bohm Effect.- Aharonov-Bohm Effect Induced by Light.- Electro-Dynamics.- Maxwell's Equations in Three-Dimensional Space.- Causality & Nonlocality in Problem of Radiative Damping of Electron.- Hierarchic Theory of Oscillations and Waves and Its Application to Nonlinear Problems of Relativistic Electrodynamics.- Electromagnetic Theory with Space-Charges in Vacuo.- Some Information about the Four Experimental Sectors of Physics in which Superluminal Motions seem to Appear.- Incompleteness of Classical Electrodynamics and Longitudinal Non-Local Electromagnetic Action as One of the Missing Elements.- Superluminal Propagation Speed of Longitudinally Oscillating Electrical Fields.- Gravitation and Inertia.- Derivation of Newton's Law of Gravitation and Discovery of the Unique Normal Modes of the Universe.- A Limit on the Longitudinal Graviton Mass.- Implications of Mach's Principle: Dark Matter and Observable Gravitons.- The Vigier Pinch.- The Zero-Point Field and Inertia.- Electromagnetic Vacuum and Inertial Mass.- Light and Photons.- Shedding Light on Light.- Quantum Phase of Light via Spin of Photons.- Neither Particle-like nor Wave-like Behaviour of a Photon.- EPR, Magic and the Nature of Light.- The Mass-Connected Photon.- Mathematical Physics.-Superluminal Transformations in Spacetimes of Definite Metric.- Uniform Spaces via Topological Groups and Non-Locality.- Gauge Mechanical View of Physical Reality.- Spacetime Invariance and Scale Effect.- Quantum Measurement, Gravitation, and Locality in the Dynamic Theory.- Particle Physics.- Chiral Interactions of Massive Particles in the (1/2,0)?(0,1/2) Representation.- Causality in Relativistic Multi-Particle Classical Dynamic Systems.- Hydrodynamical Reformulation and Quantum Limit of the Barut-Zanghi Theory.- Quantum Theory.- The Unreasonable Effectiveness of Mathematics in Physics.- Localization Problem in the Relativistic Quantum Mechanics.- The Original EPR State, Bell Inequalities, and Realist Interpretations of Quantum Mechanics.- Recovery of an Interference Pattern Hidden by Noise.- Interparticle Interactions and Nonlocality in Quantum Field Theory.- On Interacting Systems of Space: or, Co-Efficient Fields.- Are the Bader Laplacian and the Bohm Quantum Potential Equivalent.- The Relativistic Kinematics of the De Broglie Phase Wave.- Classical Embeddings of Schrodinger's Equation and Non-Locality.- Wave-Packet Model and Mach-Zehnder-Type Interferometers.- Causality & Nonlocality as Axioms for Quantum Mechanics.- Bell's Inequality Violation and Localization.- The Physical Consequences of a New Version of the Dirac Equation.- Beyond Bohm-Vigier Quantum Mechanics.- Why Two-Photon but Not Two Photons.- Non-Linear Schrödinger Equation, Burger's Equation and Superposition of Solutions.- Can a Falling Tree Make a Noise in Two Forests at the Same Time?.- Connection Between Classical and Quantum Descriptions of Evolution.- Additional Articles.- A Minimal Local Extension of the Quantum Formalism.- Deterministic Explanation of Quantum Mechanics - Two Photon"Ghost" Diffraction Calculations.- Some Properties of a Regularized Classical Electromagnetic Self-Interaction.- Papers not Included in the Proceedings.- Author Index.