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Quantum Gravity: a Progress Report

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arxiv gr-qc/0108040 v1 pith:336YAQZJ submitted 2001-08-14 gr-qc hep-th

S. Carlip This is my paper · ORCID
classification gr-qchep-th
keywords gravityquantumprogresstheoryattemptsbedeviledcomecomplete
verification ladder T0 review T1 audit T2 compute T3 formal

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The problem of reconciling general relativity and quantum theory has fascinated and bedeviled physicists for more than 70 years. Despite recent progress in string theory and loop quantum gravity, a complete solution remains out of reach. I review the status of the continuing effort to quantize gravity, emphasizing the underlying conceptual issues and the various attempts to come to grips with them.

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Cited by 6 Pith papers

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

  1. Quasinormal modes of a quantum inspired black hole in four dimensions with cosmological constant

    gr-qc 2026-07 conditional novelty 6.0 of 10

    Quasinormal frequencies for scalar and Dirac perturbations of a Kazakov-Solodukhin-type quantum black hole with Lambda are computed by WKB and characteristic integration; all modes are stable and the quantum parameter...

  2. Collective excitations in quantum gravity condensates

    gr-qc 2026-05 unverdicted novelty 6.0 of 10

    Collective excitations analogous to phonons are derived in quantum gravity condensates within a group field theory model, yielding leading beyond-mean-field corrections to emergent Friedmann dynamics.

  3. Exact path integrals on half-line in quantum cosmology with a fluid clock and aspects of operator ordering ambiguity

    gr-qc 2025-01 conditional novelty 6.0 of 10

    For minisuperspace dimension D>2 with a fluid clock, adding a specific curvature term makes physical predictions independent of a large class of operator orderings; in D=1 the ambiguity remains.

  4. Cancellation of one-parameter graviton gauge dependence in the effective scalar field equation in de Sitter

    hep-th 2026-02 unverdicted novelty 5.0 of 10

    Gauge dependence cancels in the one-loop effective scalar equation in de Sitter when all diagram contributions including external mode corrections are collected.

  5. Beyond general relativity: gravitational waves in non-minimally coupled theories

    gr-qc 2025-10 conditional novelty 5.0 of 10

    A generalized propagation parameterization for gravitational-wave strains is extended to O(H²) and O(H′), then mapped to Kalb-Ramond, axion-dilaton–Chern-Simons–Gauss-Bonnet, and U(1) dark-photon models.

  6. Quantum-Gravitational Backreaction in the BTZ Background from Curved Momentum Space

    gr-qc 2025-09 unverdicted novelty 5.0 of 10

    A semiclassical deformed BTZ solution encodes Planck-scale kinematic modifications from curved momentum space in a nonlinear microscopic-to-ADM mass map, leaving local geometry and thermodynamics unchanged in form.

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