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Spectra of Length and Area in 2+1 Lorentzian Loop Quantum Gravity

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arxiv gr-qc/0212077 v2 pith:NA47XHSZ submitted 2002-12-18 gr-qc hep-th

classification gr-qchep-th
keywords intervalsspectrumareadiscretegravitylengthlooplorentzian
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We study the spectrum of the length and area operators in Lorentzian loop quantum gravity, in 2+1 spacetime dimensions. We find that the spectrum of spacelike intervals is continuous, whereas the spectrum of timelike intervals is discrete. This result contradicts the expectation that spacelike intervals are always discrete. On the other hand, it is consistent with the results of the spin foam quantization of the same theory.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Indefinite probabilities in quantum spacetime: A deepening of unpredictability

    quant-ph 2026-05 unverdicted novelty 7.0 of 10

    SU_q(2) quantum group applied to spin-1/2 rotations yields non-commuting probability operators, an uncertainty principle for probabilities, and non-commutative rotation matrices between observers.

  2. Indefinite probabilities in quantum spacetime: A deepening of unpredictability

    quant-ph 2026-05 conditional novelty 6.0 of 10

    SU_q(2) rotational symmetry turns spin probabilities into non-commuting operators, yielding an uncertainty principle that prevents sharp measurement of relative observer orientations.

  3. Indefinite probabilities in quantum spacetime: A deepening of unpredictability

    quant-ph 2026-05 unverdicted novelty 5.0 of 10

    Using the SU_q(2) quantum group for spin rotations yields non-commuting probability operators, implying indefinite probabilities and preventing sharp determination of relative observer orientations.

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