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Quantum gravitational fluctuations and the semi-classical limit

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arxiv gr-qc/9810073 v3 pith:KHS24Z3S submitted 1998-10-22 gr-qc astro-phhep-th

classification gr-qcastro-phhep-th
keywords gravitationalsemi-classicalfluctuationslimitquantumapproximationattemptavoidance
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An attempt is made to go beyond the standard semi-classical approximation for gravity in the Born-Oppenheimer decomposition of the wave-function in minisuperspace. New terms are included which correspond to quantum gravitational fluctuations on the background metric. Their existence renders the definition of the semi-classical limit rather delicate and can lead to the avoidance of the singularities the classical theory predicts in cosmology and in the gravitational collapse of compact objects.

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  1. Bounded compactness from G(E)UP

    gr-qc 2025-07 conditional novelty 6.0 of 10

    The generalized uncertainty principle bounds the compactness of any object much heavier than the Planck mass by about 1/α, and the existence of black holes forces the GUP parameter to satisfy α ≲ 2.

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