Some Aspects of Massive World-Brane Dynamics

TL;DR

This paper investigates the dynamics of excited D-branes with massive open strings, analyzing decay rates, polarization effects, and the induced size of D-branes, revealing novel energy-dependent behaviors and interactions.

Contribution

It provides new calculations of decay rates and static forces for massive open strings on D-branes, highlighting polarization-dependent suppression and the effective size of D-branes.

Findings

Splitting decay rates are suppressed for parallel polarization.

Transverse polarization decay rates decrease with energy.

Massive open strings induce a string-scale size on D-branes.

Abstract

We study the internal dynamics of Ramond-Ramond solitons excited far from the BPS limit by leading Regge trajectory open strings. The simplest world volume process for such strings is splitting into two smaller pieces, and we calculate the corresponding decay rates. Compared to the conventional open superstring, the splitting of states polarized parallel to the brane is suppressed by powers of logarithms of the energy. The rate for states polarized transverse to the brane {\em decreases} with increasing energy. We also calculate the static force between a D-brane excited by a massive open string and an unexcited D-brane parallel to it. The result shows that transversely polarized massive open strings endow D-branes with a size of order the string scale.