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    LoyalLoyalJusticeJustice
    Made withinDC&Austin
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    Home/Original/inverse
    See Original
    Inverse View

    It is not the case that Kibble and Sciama independently showed that torsion-based Poincaré gauge theories couple spinors to gravity without reducing the foundational role to the vierbein alone.

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    Reasons For

    1 perspective
    Reason for
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    • 1.Experimental constraints on torsion are extremely tight; no empirical evidence supports torsion effects at detectable scales in current observations.
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    • 2.The vierbein formalism already incorporates spinor coupling adequately; torsion appears redundant rather than foundationally necessary for this purpose.
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    • 3.Kibble-Sciama theories introduce additional degrees of freedom lacking observational support, violating parsimony without compensating theoretical gains.
      ?

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    Reasons Against

    1 perspective
    Reason against
    ?
    • 1.Poincaré gauge theory naturally incorporates both translation and rotation symmetries, providing a more complete geometric framework than metric-only formulations.
      ?

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    • 2.Torsion enables direct coupling of intrinsic spin to spacetime structure, explaining angular momentum conservation without auxiliary assumptions.
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    • 3.Kibble-Sciama formalism reduces to Einstein gravity in the limit of zero torsion, demonstrating consistency with empirical success of GR.
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