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    Justifying measures on sets of spacetime models as measur... — Carmelics
    Home/Skepticism
    HistoryEditSee Inverse

    Justifying measures on sets of spacetime models as measures of objective chance in a cosmological setting is especially difficult.

    Modality & PossibilitySkepticism
    ?Rate how convincing each reason is below to see the overall strength.
    1 reason for
    2 reasons against

    Reasons For

    1 perspective
    Reason for
    ?
    • 1.The frequency interpretation of objective chance is strained when the phenomenon in question — the development of closed timelike curves — may be non-repeated.
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    • 2.The propensity interpretation of objective chance is strained because there is no identifiable chance mechanism for producing cosmological models.
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    • 3.The leading interpretations of objective chance are the frequency interpretation and the propensity interpretation.
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    Reasons Against

    2 perspectives
    Reason against 1 of 2
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    • 1.Humean Best Systems accounts (Lewis, Loewer) ground objective chance in patterns across the mosaic without requiring repeated trials or physical mechanisms.
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    • 2.On the Best Systems framework, measures over cosmological models can earn chance-status by featuring in the simplest, strongest systematization of the total history.
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    • 3.Therefore the difficulty identified presupposes a non-Humean constraint on chance that is itself contested, not a universal feature of objective chance.
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    Reason against 2 of 2
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    • 1.Everettian quantum cosmology (Saunders, Wallace) derives Born-rule probabilities from branch-counting measures without invoking frequencies over distinct universe-tokens.
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    • 2.If intra-theoretic structural measures can ground objective chance in a single-universe quantum setting, analogous measure-theoretic reasoning applies to spacetime model spaces.
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    Connections

    2 topics

    Truth & Knowledge1 linkedCausation1 linked

    Related

    Everettian quantum cosmology (Saunders, Wallace) derives Born-rule probabilities...Humean Best Systems accounts (Lewis, Loewer) ground objective chance in patterns...If intra-theoretic structural measures can ground objective chance in a single-u...On the Best Systems framework, measures over cosmological models can earn chance...
    +4 moreShow less
    The frequency interpretation of objective chance is strained when the phenomenon...The leading interpretations of objective chance are the frequency interpretation...The propensity interpretation of objective chance is strained because there is n...

    Similar

    The propensity interpretation of objective chance is strained because ...82%Only well-defined probative systems are suitable for determining the i...73%Invariance ensures spacetime coincidences are univocally determined72%The spacetime metric is fully determined by the inertial and causal st...72%

    Source

    AI-extracted1/3 agreementValid
    SEP: time-machine
    View source passageHide passage
    Another open question is whether physically more realistic spacetimes than Misner also permit the operation of time machines and how generic time-machine spacetimes are in particular spacetime theories, such as general relativity. If time-machine spacetimes turn out to be highly non-generic, the fan of time machines can retreat to a weaker concept of Thornian time machine by taking a page from probabilistic accounts of causation, the idea being that a time machine can be seen to be at work if it
    Extraction notes

    Validity: Extracted via Max plan + API grounding/validity checks

    Details

    Therefore the difficulty identified presupposes a non-Humean constraint on chanc...
    Type
    claim
    Perspectives
    3 (1 for, 2 against)
    Edits
    1 edit