# Spherical D-brane by Tachyon Condensation

## TL;DR

This paper introduces a novel tachyon condensation process that creates a spherical D-brane system in flat spacetime, involving a deformation of known solutions and the realization of a spherical D2-brane with D0-brane charge.

## Contribution

It presents a new tachyon condensation mechanism producing spherical D-branes, distinct from fuzzy sphere solutions, with detailed analysis of stability and flux configurations.

## Key findings

- The system has correct tension and RR-coupling.
- The spherical D-brane is stabilized in RR-flux backgrounds.
- The approach emphasizes the role of projective modules in tachyon condensation.

## Abstract

We find a novel tachyon condensation which provides a D-brane system with spherical worldvolume in the flat spacetime. The tachyon profile is a deformation of a known D0-brane solution on non-BPS D3-branes in type IIA superstring theory, which realizes a bound state of a spherical D2-brane and a D0-brane. The D0-brane is resolved into the sphere as a $U(1)$ monopole flux of the unit magnetic charge. We show that the system has the correct tension and the RR-coupling. Although the low energy effective action of the system is the same as that of the dual description of the fuzzy sphere solution of multiple D0-branes, our system cannot be equivalent to the fuzzy sphere. We argue that the sphere can be stable in a certain RR-flux background. The use of projective modules in describing the tachyon condensation is emphasized.