Excitations of D-strings, Entropy and Duality

TL;DR

This paper investigates the excitations, energy thresholds, and entropy corrections of D-strings, revealing their relation to elementary strings and advancing understanding of D-string dynamics in string theory.

Contribution

It provides a detailed analysis of BPS and non-BPS excitations of D-strings, including energy thresholds and entropy corrections, highlighting their connection to elementary strings.

Findings

Energy thresholds for exciting long D-strings are derived.

Leading entropy correction from non-BPS states is computed.

Relations between D-string excitations and elementary string properties are established.

Abstract

We examine the BPS and low energy non-BPS excitations of the D-string, in terms of open strings that travel on the D-string. We use this to study the energy thresholds for exciting a long D-string, for arbitrary winding number. We also compute the leading correction to the entropy from non-BPS states for a long D-string, and observe the relation of all these quantities with the corresponding quantities for the elementary string.