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The quantum physics of chronology protection

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arxiv gr-qc/0204022 v2 pith:V36GM6OV submitted 2002-04-05 gr-qc hep-th

Matt Visser (Washington University in Saint Louis) This is my paper
classification gr-qchep-th
keywords chronologyprotectionclosedcurvesphysicsstephentimeabhor
verification ladder T0 review T1 audit T2 compute T3 formal
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This is a brief survey of the current status of Stephen Hawking's ``chronology protection conjecture''. That is: ``Why does nature abhor a time machine?'' I'll discuss a few examples of spacetimes containing ``time machines'' (closed causal curves), the sorts of peculiarities that arise, and the reactions of the physics community. While pointing out other possibilities, this article concentrates on the possibility of ``chronology protection''. As Stephen puts it: ``It seems that there is a Chronology Protection Agency which prevents the appearance of closed timelike curves and so makes the universe safe for historians.''

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Cited by 4 Pith papers

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

  1. Exact, non-singular black holes from a phantom DBI Field as primordial dark matter

    gr-qc 2025-11 unverdicted novelty 7.0 of 10

    Exact non-singular black holes from the phantom DBI field evaporate to gram-mass relics, opening a new mass window for primordial black holes as dark matter.

  2. Closed Timelike Curves from a Vacuum Traveling Wave

    gr-qc 2026-07 unverdicted novelty 6.0 of 10

    An exact vacuum solution to Einstein's equations is constructed that forms closed timelike curves from regular asymptotically flat initial data respecting energy conditions.

  3. Metric affine gravity with dynamical chronology protection

    gr-qc 2026-04 unverdicted novelty 6.0 of 10

    A new metric-affine gravity toy model dynamically generates a global time function via projective invariance breaking to enforce stable causality, recovering mimetic gravity and yielding a broader dark sector.

  4. Are Petrov type-N and D spacetimes admitting CTCs valid in $f(R,\mathcal{L}_m,\Phi,X)$ gravity?

    gr-qc 2026-05 unverdicted novelty 4.0 of 10

    The Ori and Ahmed CTC metrics remain exact solutions in the f(R, L_m, Φ, X) model f = R + L_m + (λ/2)X, with chronology-violating regions preserved and no enforced protection from the scalar degree of freedom.

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