## Out of this World: Colliding Universes, Branes, Strings, and Other Wild Ideas of Modern PhysicsThis book is an attempt to share some of the fascinating and exciting ideas of modern theoretical physics with a non-mathematical audience. I also hope to give some appreciation of the exceptionally creative people who have generated these ideas. I had no intention of writing a comprehen sive history of these ideas, however; I apologize to those physicists whose important contributions I may have omitted. Several people have contributed directly to the writing of this book, and I would like to take this chance to thank them. Clive Horwood of Praxis Publishing and Paul Farrell of Copernicus Books have both been supportive of the project. Anna Painter has been an exceptionally thorough editor and has provided invaluable advice. Dr John Mason and Lyman Lyons both offered constructive criticism of an early draft. The errors that remai- and errors and misinterpretations are inevitable in any attempt to explain the subtle ideas of theoretical physics without the aid of mathematics - are my sole responsibility. I would like to thank Ron, Ronnie, Peter, Jackie, Emily, and Abigail for their support. And, most importantly, I would like to thank Heike and Jessica for their patience. Stephen Webb Milton Keynes, April 2004 1X FIGURE CREDITS I would like to acknowledge the following sources and copyright holders for granting permission to use their images. Figure 8 is from the Wilson A. Bentley collection. Figure 14 is courtesy ofNASA. |

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#### LibraryThing Review

User Review - IslandDave - LibraryThing(cross-posted on my blog: http://davenichols.net/out-world-stephen-webb) I didn't expect to enjoy this book as much as I did. Having picked it up a few weeks ago, I expected it to sit on my shelf ... Read full review

#### LibraryThing Review

User Review - fpagan - LibraryThingA good one -- more informative than most qualitative accounts of the latest beyond-the-Standard-Model physics. Dares to describe such things as the AdS/CFT correspondence (Anti-de Sitter / Conformal ... Read full review

### Contents

INTRODUCTION | 1 |

SYMMETRY | 9 |

TWIN PILLARS OF PHYSICS | 29 |

BUILDING BLOCKS OF THE UNIVERSE | 49 |

THE STANDARD MODEL | 79 |

GUTS AND SUSY | 113 |

HIGHER DIMENSIONS | 141 |

SUPERSTRINGS | 153 |

THE STORY OF M | 181 |

OF BRANES AND BLACK HOLES | 207 |

OUR WORLD AS A HOLOGRAM | 225 |

WHEN WORLDS COLLIDE | 245 |

GLOSSARY | 287 |

BIBLIOGRAPHY | 301 |

### Common terms and phrases

11-dimensional atomic baryon Big Bang black hole brane calculate chiral Collider color charge compactified cosmic ray coupling constant D-branes described diagram dilaton distance duality Einstein electric charge electromagnetic electron electroweak energy entropy equations event horizon example existence experiments fermions Feynman FIGURE force four-dimensional fundamental particles gauge bosons gauge symmetry gluons grand unified theories gravitational field graviton hadrons heterotic string hierarchy problem Higgs idea infinities invariance Kaluza-Klein large extra dimensions leptons light look Lorentz symmetry M-theory magnetic mass massive massless mathematical measure meters momentum monopoles muon neutrino neutron objects observe pair particle physics perturbation physicists Planck scale possess principle properties quantum field theory quantum mechanics quantum particle quarks relativistic rotational scenario space spacetime spatial dimensions special relativity spin Standard Model string theory strong interaction supergravity supergravity theories superstring theory supersymmetry theory of gravity transformation type IIA unification Universe weak interaction Witten