ACKNOWLEDGMENTS

For technical discussions I am indebted to Doctors Riley Newman, David Book and Sidney Coleman.

Many facets of this work were improved by my wife, Joan Abbe. Her patience and support, as well as that of my children, Alyson and Mark, were invaluable.

For editing and work on the final draft I thank Asenath Hammond. I am indebted to David and Marilee Samuelson, Charles Brown, Malcolm Edwards, Richard Curtis, Lawrence Littenberg and especially David Hartwell for comments on the manuscript.

Many scientific elements in this novel are true. Others are speculative, and thus may well prove false. My aim has been to illuminate some outstanding philosophical difficulties in physics. If the reader emerges with the conviction that time represents a fundamental riddle in modern physics, this book will have served its purpose.

GREGORY BENFORD

Cambridge

August, 1979

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