Skip to content
Carmelics
TopicsThinkersChangesContributorsLoading account…

    Carmelics

    A reasoning platform. Break down any belief into clear reasons, explore both sides, and weigh the evidence honestly.

    Navigate

    • Topics
    • Search
    • Recent Changes
    • Contribute
    • How It Works
    • Glossary
    • Thinkers
    • Contributors
    • About
    • Statistics
    • Terms
    • Privacy

    Database

    Statements
    —
    Perspectives
    —
    Topics
    —

    Press ? for keyboard shortcuts

    LoyalLoyalJusticeJustice
    Made withinDC&Austin
    Statements
    321,452
    Perspectives
    108,905
    Topics
    42
    The CMC approach is not viable as an approach to quantum ... — Carmelics
    Home/Modality & Possibility
    HistoryEditSee Inverse

    The CMC approach is not viable as an approach to quantum gravity

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

    Reasons For

    2 perspectives
    Reason for 1 of 2
    ?
    • 1.CMC (Constant Mean Curvature) slicing imposes a preferred foliation of spacetime, violating the diffeomorphism invariance central to general relativity.
      ?

      Think about whether this reason is strong or weak

    • 2.Any viable quantum gravity approach must preserve or recover the background independence that general relativity demands as a foundational symmetry.
      ?

      Think about whether this reason is strong or weak

    • 3.An approach that structurally violates a foundational symmetry of its target theory cannot constitute a viable quantization of that theory.
      ?

      Think about whether this reason is strong or weak

    Reason for 2 of 2
    ?
    • 1.Kuchař and Torre demonstrated that CMC-based approaches face a severe problem of time: the CMC Hamiltonian generates fictitious gauge transformations rather than true dynamics.
      ?

      Think about whether this reason is strong or weak

    • 2.An approach whose Hamiltonian cannot distinguish genuine temporal evolution from gauge redundancy fails the minimal criterion of recovering classical dynamics in the appropriate limit.
      ?

      Think about whether this reason is strong or weak

    Reasons Against

    1 perspective
    Reason against
    ?
    • Simply not being ruled out on experimental grounds does not render an approach viable
      ?

      Think about whether this reason is strong or weak

    Sign in or register to share your perspective on this statement.

    Next step

    Based on where you are in your exploration

    Strongest counterpoint
    Explore the most compelling reason on the other side.

    Topics

    Modality & Possibility

    Connections

    1 topic

    Truth & Knowledge1 linked

    Related

    An approach that structurally violates a foundational symmetry of its target the...An approach whose Hamiltonian cannot distinguish genuine temporal evolution from...Any viable quantum gravity approach must preserve or recover the background inde...CMC (Constant Mean Curvature) slicing imposes a preferred foliation of spacetime...
    +2 moreShow less
    Kuchař and Torre demonstrated that CMC-based approaches face a severe problem of...Simply not being ruled out on experimental grounds does not render an approach v...

    Similar

    The CMC approach is not genuinely an approach to quantum gravity in th...91%CMC therefore stands as a viable route to quantum gravity81%Mie's approach is necessarily limited to the framework of special rela...75%There is no logical necessity to quantize the gravitational field.75%

    Source

    AI-extracted1/3 agreementValid
    SEP: quantum-gravity
    View source passageHide passage
    Bradley Monton (2006) has argued that a specific version of canonical quantum gravity – that with a so-called constant mean extrinsic curvature [CMC] (or fixed) foliation – has the necessary resources to render presentism (the view that all and only presently existing things exist) a live possibility (see the section on Presentism, Eternalism, and The Growing Universe Theory in the entry on time for more on presentism). The reason is that with such a fixed foliation one has at one’s disposal s
    Extraction notes

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

    Details

    Type
    claim
    Perspectives
    3 (2 for, 1 against)
    Edits
    1 edit