New $AdS_3$ Branes and Boundary States

TL;DR

This paper explores new D-brane configurations in $AdS_3$, including a three-brane wrapping the entire space, and analyzes their properties and open string spectra, expanding the understanding of brane dynamics in this background.

Contribution

It introduces a novel three-brane in $AdS_3$ using a specific construction, complementing known branes and satisfying consistency conditions.

Findings

The three-brane wraps the entire $AdS_3$ space.

All branes satisfy Cardy's condition.

Open string spectra are explicitly derived.

Abstract

We examine D-branes on $AdS_3$, and find a three-brane wrapping the entire $AdS_3$, in addition to 1-branes and instantonic 2-branes previously discussed in the literature. The three-brane is found using a construction of Maldacena, Moore, and Seiberg. We show that all these branes satisfy Cardy's condition and extract the open string spectrum on them.