Kinky D-branes and straight strings of open string tachyon effective theory

TL;DR

This paper constructs kink D-brane solutions and their T-duals using non-BPS tachyonic D-brane effective action, revealing configurations that resemble fundamental strings and avoid previous pathologies.

Contribution

It introduces new kink D-brane solutions and their T-duals within tachyon effective theory, demonstrating configurations akin to fundamental strings with improved stability.

Findings

Solutions collapse to zero radius at zero angular momentum

Configurations resemble fundamental strings without pathologies

Justification via generalized gauge transformations

Abstract

In this letter we construct the kink D1-brane super D-helix solution and its T-dual the D2-brane supertube using the effective action of non-BPS tachyonic D-branes . In the limit of zero angular momentum, both types of solutions collapse to zero radius, giving rise respectively to a degenerate string configuration corresponding to a particle travelling with the speed of light and to a static straight string configuration. These solutions share all the properties of fundamental strings and do not have the pathological behavior of other solutions previously found in this context. A short discussion on the ``generalized gauge transformations'' suggested by Sen is used to justify the validity of our approach.