# nLab D=2 gravity

Contents

### Context

#### Gravity

gravity, supergravity

# 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 $AdS_2\times S^{d-2}$ of near-extremal black holes in $d$-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.