James Gleick - Time Travel

ALSO BY JAMES GLEICK

Chaos: Making a New Science

Genius: The Life and Science of Richard Feynman

Faster: The Acceleration of Just About Everything

What Just Happened: A Chronicle from the Information Frontier

Isaac Newton

The Information: A History, a Theory, a Flood

Copyright 2016 by James Gleick

All rights reserved. Published in the United States by Pantheon Books, a division of Penguin Random House LLC, New York, and distributed in Canada by Random House of Canada, a division of Penguin Random House Canada Limited, Toronto.

Pantheon Books and colophon are registered trademarks of Penguin Random House LLC.

Grateful acknowledgment is made to Houghton Mifflin Harcourt Publishing Company for permission to reprint excerpts from Burnt Norton and The Dry Salvages from Four Quartets by T. S. Eliot, copyright 1936 by Houghton Mifflin Harcourt Publishing Company, renewed 1964 by T. S. Eliot, and renewed 1969 by Esme Valerie Eliot. Reprinted by permission of Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Library of Congress Cataloging-in-Publication Data

Name: Gleick, James.

Title: Time travel / James Gleick.

Description: New York : Pantheon Books [2016]

Identifiers: LCCN 2016002323. ISBN 9780307908797 (hardcover). ISBN 9780307908803 (ebook). ISBN 9780375715204 (open market).

Subjects: LCSH: Space and timePopular works. Time travelPopular works.

Classification: LCC QC173.59.S65 G54 2016. DDC 530.11dc23. LC record available at lccn.loc.gov/2016002323

Ebook ISBN9780307908803

www.pantheonbooks.com

Jacket by Peter Mendelsund

v4.1_r1

ep

To Beth, Donen,

and Harry

Your now is not my now; and again, your then is not my then; but my now may be your then, and vice versa. Whose head is competent to these things?

Charles Lamb (1817)

The fact that we occupy an ever larger place in Time is something that everybody feels.

Marcel Proust (1927?)

And tomorrow

Comes. Its a world. Its a way.

W. H. Auden (1936)

Contents

Cover

Also by James Gleick

Title Page

Copyright

Dedication

Epigraph

Chapter One: Machine

Chapter Two: Fin de Sicle

Chapter Three: Philosophers and Pulps

Chapter Four: Ancient Light

Chapter Five: By Your Bootstraps

Chapter Six: Arrow of Time

Chapter Seven: A River, a Path, a Maze

Chapter Eight: Eternity

Chapter Nine: Buried Time

Chapter Ten: Backward

Chapter Eleven: The Paradoxes

Chapter Twelve: What Is Time?

Chapter Thirteen: Our Only Boat

Chapter Fourteen: Presently

Acknowledgments

Sources and Further Reading

Illustration Credits

About the Author

ONE

Machine

Being young, I was skeptical of the future, and saw it as a matter of potential only, a state of things that might or might not arise and probably never would.

John Banville (2012)

A MAN STANDS AT the end of a drafty corridor, a.k.a. the nineteenth century, and in the flickering light of an oil lamp examines a machine made of nickel and ivory, with brass rails and quartz rodsa squat, ugly contraption, somehow out of focus, not easy for the poor reader to visualize, despite the listing of parts and materials. Our hero fiddles with some screws, adds a drop of oil, and plants himself on the saddle. He grasps a lever with both hands. He is going on a journey. And by the way so are we. When he throws that lever, time breaks from its moorings.

The man is nondescript, almost devoid of featuresgrey eyes and a pale face and not much else. He lacks even a name. He is just the Time Traveller: for so it will be convenient to speak of him. Time and travel: no one had thought to join those words before now. And that machine? With its saddle and bars, its a fantasticated bicycle. The whole thing is the invention of a young enthusiast named Wells, who goes by his initials, H. G., because he thinks that sounds more serious than Herbert. His family calls him Bertie. He is trying to be a writer. He is a thoroughly modern man, a believer in socialism, free love, and bicycles.*1 A proud member of the Cyclists Touring Club, he rides up and down the Thames valley on a forty-pounder with tubular frame and pneumatic tires, savoring the thrill of riding his machine: A memory of motion lingers in the muscles of your legs, and round and round they seem to go. At some point he sees a printed advertisement for a contraption called Hackers Home Bicycle: a stationary stand with rubber wheels to let a person pedal for exercise without going anywhere. Anywhere through space, that is. The wheels go round and time goes by.

The turn of the twentieth century loomeda calendar date with apocalyptic resonance. Albert Einstein was a boy at gymnasium in Munich. Not till 1908 would the Polish-German mathematician Hermann Minkowski announce his radical idea: Henceforth space by itself, and time by itself, are doomed to fade away into mere shadows, and only a kind of union of the two will preserve an independent reality. H. G. Wells was there first, but unlike Minkowski, Wells was not trying to explain the universe. He was just trying to gin up a plausible-sounding plot device for a piece of fantastic storytelling.

Nowadays we voyage through time so easily and so well, in our dreams and in our art. Time travel feels like an ancient tradition, rooted in old mythologies, old as gods and dragons. It isnt. Though the ancients imagined immortality and rebirth and lands of the dead time machines were beyond their ken. Time travel is a fantasy of the modern era. When Wells in his lamp-lit room imagined a time machine, he also invented a new mode of thought.

Why not before? And why now?

THE TIME TRAVELLER BEGINS with a science lesson. Or is it just flummery? He gathers his friends around the drawing-room fire to explain that everything they know about time is wrong. They are stock characters from central casting: the Medical Man, the Psychologist, the Editor, the Journalist, the Silent Man, the Very Young Man, and the Provincial Mayor, plus everyones favorite straight man, an argumentative person with red hair named Filby.

You must follow me carefully, the Time Traveller instructs these stick figures. I shall have to controvert one or two ideas that are almost universally accepted. The geometry, for instance, that they taught you at school is founded on a misconception. School geometryEuclids geometryhad three dimensions, the ones we can see: length, width, and height.

Naturally they are dubious. The Time Traveller proceeds Socratically. He batters them with logic. They put up feeble resistance.

You know of course that a mathematical line, a line of thickness nil, has no real existence. They taught you that? Neither has a mathematical plane. These things are mere abstractions.

That is all right, said the Psychologist.

Nor, having only length, breadth, and thickness, can a cube have a real existence.

There I object, said Filby. Of course a solid body may exist. All real things

So most people think. But wait a moment. Can an instantaneous cube exist?

Dont follow you, said Filby [the poor sap].

Can a cube that does not last for any time at all, have a real existence?

Filby became pensive. Clearly, the Time Traveller proceeded, any real body must have extension in four directions: it must have Length, Breadth, Thickness, andDuration.