nLab
D=2 gravity

Contents

Context

Gravity

String theory

Contents

Idea

One may consider gravity (general relativity, Einstein's equations) on spacetimes of dimension 2.

Examples

Relativistic string worldsheets

If 2d gravity is coupled to scalar “matter”-fields with values in some target space, then this may be regarded as the worldsheet-sigma-model quantum field theory of a relativistic string propagating on that target spacetime.

2d Dilaton gravity – JT gravity

A form of 2d dilaton gravity is known as Jackiw-Teitelboim gravity, or JT-gravity, for short.

JT-gravity gives a good approximation to the AdS-factor in the near horizon geometry AdS 2×S d2AdS_2\times S^{d-2} of near-extremal black holes in dd-dimensional spacetime (NSST18, MTV18).

References

Created on January 11, 2021 at 00:26:27. See the history of this page for a list of all contributions to it.