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    Earman, Smeenk, and Wüthrich's analysis requires that a t... — Carmelics
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    Challenges→The label 'time machine' should not be restricted to devices operating within a finite spatial range, because adopting a more liberal stance avoids various complications while still sufficing to elicit key points about time machines.

    Earman, Smeenk, and Wüthrich's analysis requires that a time machine's compactly generated Cauchy horizon be traceable to a bounded region, grounding causal responsibility in a finite source.

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    Key Terms

    Cauchy horizon(as a technical concept in relativity theory)
    A mathematical boundary in spacetime (the fabric of space and time) beyond which the future becomes unpredictable; it's a technical term from Einstein's theory of relativity used when analyzing time travel scenarios.
    Causal responsibility(ethics and causation)
    Being the thing that directly caused something to happen, and therefore being morally accountable for it.
    Earman, Smeenk, and Wüthrich(as names of contemporary philosophers)
    Three philosophers of physics who work together on questions about time, relativity, and causality in physics. They're known for analyzing complex scenarios in Einstein's theory of relativity.
    Time machine(as a concept in physics and philosophy)
    A hypothetical device that would allow travel backward or forward through time, often used in physics as a thought experiment to test theories.

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    bounded region(Used to illustrate scale-invariant proportionality as an alternative geometric postulate.)
    A geometric figure, such as a circle, whose properties do not depend on its absolute magnitude.
    compactly generated(Used to describe the weaker geometric condition on the future Cauchy horizon required for a Thornian time machine)
    A property of a future Cauchy horizon where the horizon is generated in a compact region, as distinct from the horizon itself being compact.

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    Causation1 linkedModality & Possibility1 linked

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    The label 'time machine' should not be restricted to devices operating within a ...

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