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The causal hierarchy of spacetimes
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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.
Forward citations
Cited by 2 Pith papers
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Semi-local observables, edge modes and quantum reference frames in quantum electromagnetism: an algebraic approach
Electromagnetic edge modes on bounded spacetimes with corners are treated as quantum reference frames for large gauge transformations via a state-independent C*-algebraic relativisation map, with superselection sector...
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Destructuring Physics: A functional derivation of spacetime
Spacetime can be represented minimally as an arbitrary set equipped with a family of real functions that, the author argues, retains the essential causal, topological, and metric content.
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