Time machines : time travel in physics, metaphysics, and science fiction
(Book)

1. An Overview of Time Travel. The Mystery of Time Travel

Machineless Time Travel Without Dreams or Drugs

Time Travel by Machine

H.G. Wells

Why His Time Machine Won't Work

Traveling to the Future

Traveling to the Past

Who Else Might Be Interested in Time Travel

Some Problems

Backward in Time

Can It Really Be Done?

The Problem of Paradoxes

The Fictional Origins of "Change the Past"

Ways to Avoid Paradoxes

Where Are All the Time Travelers?

Skepticism and Time Travelers

Einstein, Godel, and the Past

Quantum Mechanics, Black Holes, Singularities, and Time Travel

Tipler's Time Machine.

2. On the Nature of Time, Spacetime, and the Fourth Dimension. What Is Time?

Speculations on the Reality of Time

Has the Past Been for Ever?

Time and Clocks

Hyperspace and Wormholes

Monsters in Hyperspace

Space as the Fourth Dimension

Time as the Fourth Dimension

H.G. Wells on Space and Time

Spacetime and the Fourth Dimension

Spacetime, Omniscience, and Free Will

Does the Future Already Exist? Is the Past Still Around? Chapter 3 The Arrows of Time 179(66) The Language of Time Travel 180(1) Does Time Have a Direction? 181(4) Cause and Effect 185(6) Backward Causation 191(7) What Does "Now" Mean? 198(7) Irreversibility 205(3) Worlds in Reverse 208(12) The Philosophy and Physics of Reversed Time 220(7) Entropy as Time's Arrow 227(9) Other Arrows of Time 236(4) Multidimensional Time 240(5) Chapter 4 Time Travel Paradoxes and (Some of) Their Explanations 245(110) Paradoxes 246(5) Early Science Fiction Speculations on Time Travel Paradoxes 251(5) Two Basic Time Travel Paradoxes 256(3) Can the Present Change the Past? Can the Past Be Un-Done? 259(10) Changing the Past vs. Affecting It 269(16) Why Can't a Time Traveler Kill His Grandfather? 285(9) Quantum Mechanics and Time Travel 294(10) Causal Loops 304(15) Sexual Paradoxes 319(4) Maxwell's Equations and Advanced Effects 323(4) Communication with the Past 327(5) Wheeler and Feynman and Their Bilking Paradox 332(4) Absorber Theory and Signaling to the Past 336(6) Tachyonic Signals, Spooky Actions, and the Bell Antitelephone 342(13) Epilogue 355(60) Notes and References 367(48) Tech Notes 415(130) 1. What Time Is Now? 415(8) 2. Time Dilation via the Photon Clock 423(6) 3. The Lorentz Transformation 429(10) 4. Spacetime Diagrams, Light Cones, Metrics, and Invariant Intervals 439(20) 5. Proper Time, Curved World Lines, and the Twin Paradox 459(8) 6. A High-Speed Rocket Is a One-Way Time Machine to the Future 467(8) 7. Superluminal Speeds, Backward Time Travel, and Wrap Drives, or Faster-Than-Light Into the Past 475(14) 8. Backward Time Travel According to Godel and Tipler 489(8) 9. Wormhole Time Machines 497(30) 10. "Solving" the Einstein Gravitational Field Equations, Unphysical Mass-Energy, and the Cosmic String Time Machine 527(10) 11. Time and Gravity 537(8) Glossary of Important Terms and Concepts