Comments on noncommutative gravity

TL;DR

This paper examines the derivation of noncommutative gravity from string theory, revealing additional interaction terms and questioning the physical relevance of twisted diffeomorphisms in this context.

Contribution

It demonstrates that string theory's low-energy limit includes more interaction terms than standard noncommutative gravity models and analyzes the non-physical nature of twisted diffeomorphisms.

Findings

Low-energy noncommutative gravity from string theory contains extra interactions.

Twisted diffeomorphisms are not genuine physical symmetries in string theory.

String theory does not preserve twisted diffeomorphisms in the low-energy limit.

Abstract

We study the possibility of obtaining noncommutative gravity dynamics from string theory in the Seiberg-Witten limit. We find that the resulting low-energy theory contains more interaction terms than those proposed in noncommutative deformations of gravity. The role of twisted diffeomorphisms in string theory is studied and it is found that they are not standard physical symmetries. It is argued that this might be the reason why twisted diffeomorphisms are not preserved by string theory in the low energy limit. Twisted gauge transformations are also discussed.