## Hiding in the Mirror: The Quest for Alternate Realities, from Plato to String Theory (by way of Alicei n Wonderland, Einstein, and The Twilight Zone)An exploration of mankind's fascination with worlds beyond our own-by the bestselling author of The Physics of Star TrekLawrence Krauss -an international leader in physics and cosmology-examines our long and ardent romance with parallel universes, veiled dimensions, and regions of being that may extend tantalizingly beyond the limits of our perception. Krauss examines popular culture's current embrace (and frequent misunderstanding) of such topics as black holes, life in other dimensions, strings, and some of the more extraordinary new theories that propose the existence of vast extra dimensions alongside our own. BACKCOVER: "An astonishing and brilliantly written work of popular science." -Science a GoGo "A brilliant, thrilling book . . . You'll have so much fun reading that you'll hardly notice you're getting a primer on contemporary physics and cosmology." -Walter Isaacson, author of Benjamin Franklin: An American Life |

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### Contents

FROM FROGS LEGS TO FIELDS | |

THE ROAD TO RELATIVITY | |

THE FOURTH DIMENSION | |

DISTURBING THE UNIVERSE | |

THE MEASURE OF ALL THINGS | |

AN EXTRA DIMENSION TO PHYSICS | |

THERE AND BACK AGAIN | |

OUT OF CHAOS | |

ALIENS FROM OTHER DIMENSIONS | |

AN ENTANGLED KNOT | |

SUPER TIMES FOR THE SUPERWORLD | |

M IS FOR MOTHER CHAPTER 16 D IS FOR BRANEWORLD CHAPTER 17 A THEORY OF NOTHING? | |

EPILOGUE | |

Acknowledgements GLOSSARY | |

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actually appeared associated atoms big bang black holes bosons branes calculate called century charged compactified cosmic cosmological curved D-branes dark energy decay describe dimensional discovered discovery distance dual string models Einstein electric electromagnetism electron elementary particles empty space ether example existence experience explore extra dimensions fact Faraday fascinating fermions fifth dimension five-dimensional forces in nature four-dimensional fourth dimension fundamental galaxies geometry grand unification gravitational field graviton gravity hidden hierarchy problem higher dimensions higher-dimensional ideas imagine implies Kaluza light rays M-theory magnetic field mass mathematical mathematician Maxwell’s measure moving neutron notion objects observed one’s particle physics perhaps physicists Planck scale possible precisely predictions produce proposed proton quantities quantum mechanics quarks radiation reality remarkable result science fiction space-time spatial dimensions special relativity spin string theory strong interaction suggested supergravity supersymmetry symmetry tesseract theoretical theorists three-brane three-dimensional space turns two-dimensional ultimately underlying unified vacuum energy virtual particles Witten Yang-Mills