SL(2;R) Duality of the Noncommutative DBI Lagrangian

TL;DR

This paper explores how the $SL(2;R)$ group acts on the noncommutative DBI Lagrangian, revealing dualities, symmetry conditions, and the interplay between T-duality and $SL(2;R)$ duality, with implications for noncommutative gauge theories.

Contribution

It demonstrates the $SL(2;R)$ symmetry of the noncommutative DBI Lagrangian and establishes its duality relations with the ordinary DBI Lagrangian, including the non-commutation of T-duality and $SL(2;R)$ duality.

Findings

Noncommutative and ordinary DBI Lagrangians are dual under $SL(2;R)$.

Derived $SL(2;R)$ invariant equations relating noncommutativity and dual parameters.

Showed that T-duality and $SL(2;R)$ duality do not commute on effective variables.

Abstract

We study the action of the $SL(2;R)$ group on the noncommutative DBI Lagrangian. The symmetry conditions of this theory under the above group will be obtained. These conditions determine the extra U(1) gauge field. By introducing some consistent relations we observe that the noncommutative (or ordinary) DBI Lagrangian and its $SL(2;R)$ dual theory are dual of each other. Therefore, we find some $SL(2;R)$ invariant equations. In this case the noncommutativity parameter, its $T$-dual and its $SL(2;R)$ dual versions are expressed in terms of each other. Furthermore, we show that on the effective variables, $T$-duality and $SL(2;R)$ duality do not commute. We also study the effects of the $SL(2;R)$ group on the noncommutative Chern-Simons action.