The causal hierarchy of spacetimes

  • Ettore Minguzzi

    Universita di Firenze, Italy
  • Miguel Sánchez Caja

    Universidad de Granada, Spain
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The full causal ladder of spacetimes is constructed, and their updated main properties are developed. Old concepts and alternative definitions of each level of the ladder are revisited, with emphasis in minimum hypotheses. The implications of the recently solved “folk questions on smoothability”, and alternative proposals (as recent isocausality), are also summarized.