Lecture

Holography in Classical Gravity

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Description

This lecture covers the concept of holography in classical gravity, focusing on the correspondence between string theory and gravity. Topics include strong/weak coupling duality, black hole thermodynamics, and the use of conformal field theory to define quantum gravity non-perturbatively.

Official source

Ontological neighbourhood

Physics

Quantum mechanics: Quantum gravity

Related concepts (32)

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In the physics of gauge theories, gauge fixing (also called choosing a gauge) denotes a mathematical procedure for coping with redundant degrees of freedom in field variables. By definition, a gauge theory represents each physically distinct configuration of the system as an equivalence class of detailed local field configurations. Any two detailed configurations in the same equivalence class are related by a gauge transformation, equivalent to a shear along unphysical axes in configuration space.

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In rail transport, track gauge (in American English, alternatively track gage) is the distance between the two rails of a railway track. All vehicles on a rail network must have wheelsets that are compatible with the track gauge. Since many different track gauges exist worldwide, gauge differences often present a barrier to wider operation on railway networks. The term derives from the metal bar, or gauge, that is used to ensure the distance between the rails is correct.

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