# DBI in the IR

## TL;DR

This paper explores the infrared limit of a static D3-brane in AdS5 x S5, revealing a tensionless brane governed by a conformal invariant field theory with electromagnetic duality, and provides an invariant action for these equations.

## Contribution

It introduces a new description of the IR limit of D3-branes as a tensionless brane with manifest duality symmetry and derives an invariant action for its field equations.

## Key findings

- IR limit corresponds to tensionless D3-brane at AdS horizon
- Field equations exhibit conformal invariance and SL(2;R) duality
- An SL(2;R)-invariant action is constructed

## Abstract

The IR limit of a planar static D3-brane in AdS5 x S5 is a tensionless D3-brane at the AdS horizon, with dynamics governed by a strong-field limit of the Dirac-Born-Infeld action analogous to that found from the Born-Infeld action by Bialynicki-Birula. As in that case, the field equations are those of an interacting 4D conformal invariant field theory with an Sl(2;R) electromagnetic duality invariance, but the D3-brane origin makes these properties manifest. We also find an Sl(2;R)-invariant action for these equations.