## The Early Universe: Facts and FictionFourteen years is a long time, and especially in the field of cosmology new observational results and new theoretical ideas seem to appear at a steadily increasing rate. It is achallenge to try to review the current status, to give a reasonably fair account of new developments, and not to increase the size of the book out of all proportion. So this fourth edition is practically a new book, with many chapters and sections newly written, not just updated. I have kept the original layout of the book with three parts concerned with (I) the standard model, (II) some basic implications of quantum field theory, and (III) quest ions of structure formation. I have given special emphasis to the new observations of the anisotropies of the cosmic microwave background, and attempted to explain their importance for cosmology as well as for structure formation models. There have also been improved measurements in almost every cosmologically relevant field, from the Rubble constant to element abundances and galaxy distribution statistics. Quite surprisingly, the standard cosmological models can still accommodate all these new obser vations. |

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### Contents

3 | |

Facts Observations of Cosmological Significance 29 | 28 |

Exercises | 136 |

Particle Physics and Cosmology | 143 |

Exercises | 173 |

Exercises | 200 |

Exercises | 302 |

Relic Particles from the Early Universe | 305 |

Baryon Synthesis | 339 |

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### Common terms and phrases

abundance amplitude angular anisotropy axions background baryon baryon number bosons Chap cluster comoving component const constant correlation function corresponding cosmic cosmological model dark matter decay decoupling derived determined distance distribution early universe effects electron electroweak Ellis energy density entropy equation equilibrium estimate evolution expansion fermions FL model FL universe fluctuations flux Friedmann equation galactic galaxy formation gauge gauge bosons gauge group gauge theory gravitational gravitational lens gravitino Higgs bosons Higgs field homogeneous horizon Hubble initial interactions isotropy Jeans mass Lagrangian leads lepton limit linear luminosity magnitude mass measured monopoles neutrino neutron nucleosynthesis number density objects observations parameter particles Peebles perturbations photons potential present epoch quantum quarks radiation radius ratio redshift relation relativistic scalar scale Sect solution space-time spectrum spherical standard model stars stellar string structure supersymmetry symmetry temperature theory velocity zero