## Relativity and the Nature of SpacetimeThe most important question addressed in this book is "what is the nature (the ontological status) of spacetime?" or, equivalently, "what is the dimensionality of the world at the macroscopic level?" The answer to this question is developed via a thorough analysis of relativistic effects and explicitly asking whether the objects involved in those effects are three-dimensional or four-dimensional. This analysis clearly shows that if the world and the physical objects were three-dimensional, none of the kinematic relativistic effects and the experimental evidence supporting them would be possible. The implications of this result for physics, philosophy, and our entire world view are discussed. |

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### Contents

I | 1 |

II | 9 |

III | 13 |

IV | 14 |

V | 16 |

VI | 17 |

VII | 25 |

VIII | 29 |

XXXVII | 153 |

XXXVIII | 155 |

XXXIX | 157 |

XL | 158 |

XLI | 160 |

XLII | 168 |

XLIII | 171 |

XLIV | 172 |

IX | 30 |

X | 48 |

XI | 51 |

XII | 53 |

XIII | 55 |

XIV | 56 |

XV | 70 |

XVI | 78 |

XVII | 84 |

XVIII | 91 |

XIX | 98 |

XX | 105 |

XXI | 106 |

XXII | 107 |

XXIII | 111 |

XXIV | 116 |

XXV | 117 |

XXVI | 121 |

XXVII | 122 |

XXVIII | 123 |

XXIX | 134 |

XXX | 139 |

XXXI | 142 |

XXXII | 146 |

XXXIV | 147 |

XXXV | 148 |

XXXVI | 152 |

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### Common terms and phrases

5th second absolute uniform motion anisotropic argument atoms average coordinate velocity average proper velocity B-observers ball body calculated Chap charge classical electron clock exists component consequences of special contradiction corresponding curved spacetime detected determined dimensional Earth electric field electromagnetic mass emitted end point Euclidean space experiment explain fact falling four-dimensional world four-dimensionalist view Galileo's principle inertial force inertial reference frame instantaneous interactions length contraction Lienard-Wiechert light cone light ray light signal light sphere measured Minkowski spacetime moving nature of spacetime non-inertial reference frame observers in relative particle potential present presentist view principle of relativity propagation of light quantons quantum mechanics quantum object question radical research team radical team redshift relative motion relativity of simultaneity relativized resistance respect rest restoring force rotation seen self-force shown in Fig spacecraft special relativity speed of light three-dimensional rod three-dimensional spaces three-dimensional world twin paradox updating signals velocity of light virtual photons worldline