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The 55 pages that link to Quantum gravity, each with the reason it gives.

• General relativityCompared with: General relativity is classical and does not provide a complete description of quantum spacetime.

• Quantum field theoryNarrower topic: Ordinary quantum field theory does not provide a complete, established quantization of gravity.

• Standard ModelCompared with: The Standard Model contains no quantum description of gravity.

• Quantum electrodynamicsCompared with: QED is a successful quantum field theory, but it does not quantize gravity.

• Big BangRelated: A complete theory may be needed to describe the universe’s earliest moments.

• GravityNarrower topic: No experimentally confirmed theory yet unifies gravity with quantum physics.

• Particle physicsRelated: The Standard Model does not incorporate gravity as a quantum interaction.

• String theoryNarrower topic: String theory is one proposed framework for quantum gravity.

• SpacetimeRelated: It seeks a theory that remains valid where classical spacetime geometry may fail.

• Gravitational fieldNarrower topic: A complete account must reconcile gravitational fields with quantum physics.

• Paul DiracNarrower topic: Dirac’s attempts to connect fundamental principles foreshadowed the still-unsolved unification of gravity and quantum theory.

• Hawking radiationNarrower topic: The final stages of evaporation likely require physics beyond the semiclassical calculation.

• Zero-point energyNarrower topic: A consistent theory may clarify how quantum ground-state energy gravitates.

• Grand Unified TheoryCompared with: Grand unified theories do not resolve how gravity fits into quantum physics.

• Gravitational forceCompared with: It addresses the mismatch between general relativity and quantum theory at extreme scales.

• GravitonNarrower topic: Gravitons arise in approaches that try to quantize gravity.

• Mathematical physicsRelated: Its unresolved mathematical foundations include defining quantum spacetime beyond established approximations.

• Hidden-variable theoryNarrower topic: A deeper theory of spacetime may alter assumptions underlying hidden-variable formulations.

• Quantum fieldNarrower topic: Known quantum field theories do not yet provide a complete account of dynamical spacetime.

• Planck scaleNarrower topic: It is the kind of theory expected to govern physics in this regime.

• Planck unitsNarrower topic: Planck units identify the regime where a quantum description of gravity is expected to be necessary.

• Age of the universeRelated: A theory of this kind may clarify whether time has meaning at the earliest boundary.

• GravitationNarrower topic: It seeks to reconcile general relativity with quantum physics.

• Holographic principleNarrower topic: The holographic principle is a proposed organizing feature of quantum gravity.

• Planck lengthRelated: The Planck length is the scale at which quantum-gravitational effects are expected to become significant.

• Planck epochNarrower topic: A complete theory is needed to describe the Planck epoch’s expected quantum-gravitational regime.

• Heat death of the universeNarrower topic: Unknown quantum-gravitational effects could change predictions about horizons and the universe’s ultimate state.

• M-theoryNarrower topic: M-theory is a candidate framework for quantum gravity, but its empirical status is unknown.

• Matter (physics)Related: A unified account may be needed to describe matter in the earliest universe and inside black holes.

• Fundamental interactionRelated: No experimentally confirmed framework yet unites gravity with quantum field theory.

• Quantum field theory in curved spacetimeCompared with: Unlike this framework, quantum gravity does not hold spacetime geometry fixed as a classical background.

• Vacuum energyNarrower topic: A complete account may clarify how quantum vacuum energy gravitates.

• Unruh effectRelated: Whether horizon-related thermal effects illuminate quantum gravity remains a broader, unsettled question.

• Big BounceNarrower topic: A bounce near Planck-scale density requires physics beyond classical general relativity.

• Superstring theoryNarrower topic: Superstring theory is a candidate framework for unifying quantum physics with gravity.

• Gravitational singularityRelated: A quantum theory is expected to replace classical predictions where general relativity breaks down.

• Theory of everythingRelated: It addresses the central mismatch between quantum theory and general relativity.

• Modern physicsRelated: No experimentally confirmed theory yet reconciles quantum mechanics with general relativity.

• Penrose–Hawking singularity theoremsRelated: The theorems identify limits of classical spacetime but do not determine its quantum replacement.

• SupergravityNarrower topic: Supergravity is a candidate framework, but does not by itself provide a complete quantum theory.

• Curved spacetimeRelated: It addresses regimes where classical curved spacetime may no longer suffice.

• Quantum foamNarrower topic: Quantum foam is an image associated with the unresolved effort to quantize gravity.

• Classical unified field theoriesRelated: Its unresolved challenge differs from the classical unification problem these theories addressed.

• Force carrierRelated: A complete theory would clarify whether gravity has a quantum carrier.

• Interactions and forcesRelated: A consistent quantum account of gravity remains absent from established fundamental theories.

• List of unsolved problems in physicsRelated: No experimentally confirmed theory yet unifies quantum physics and general relativity.

• Outline of physical scienceRelated: No experimentally confirmed theory yet reconciles general relativity with quantum mechanics.

• Outline of physicsRelated: No experimentally confirmed theory yet unifies quantum physics and general relativity.

• Physical phenomenaRelated: No confirmed theory yet unifies gravity with quantum descriptions of physical phenomena.

• Physics beyond the Standard ModelNarrower topic: The Standard Model does not incorporate gravity, leaving a fundamental theoretical gap.