D-brane Dynamics and Creations of Open and Closed Strings after Recommbination

TL;DR

This paper uses quantum mechanics within super-Yang-Mills theory to study D-brane recombination, revealing brane shape changes, open and closed string creation, and potential implications for inflation models.

Contribution

It introduces a quantum-mechanical approach to analyze D-brane recombination, demonstrating string creation and shape dynamics with implications for cosmology.

Findings

Brane shapes develop three extremes due to tachyon condensation.

Open string pairs are created, utilizing most of the released energy.

Closed strings, including gravitational radiation, are generated after recombination.

Abstract

A quantum-mechanical technique is used within the framework of U(2) super-Yang-Mills theory to investigate what happens in the process after recombination of two D-p-branes at one angle. Two types of initial conditions are considered, one of which with $p=4$ is a candidate of inflation mechanism. It is observed that the branes' shapes come to have three extremes due to localization of tachyon condensation. Furthermore, open string pairs connecting the decaying D-branes are shown to be created; most part of the released energy is used to create them. It also strongly suggests that creation of closed strings happens afterward. Closed strings as gravitational radiation from the D-branes are also shown to be created. A few speculations are also given on implications of the above phenomena for an inflation model.