D-branes in type I string theory
M. Frau, L. Gallot, A.Lerda, P.Strigazzi
TL;DR
This paper reviews the boundary state approach to D-branes in type I string theory, identifying stable non-BPS states and comparing their interactions with dual heterotic string states, confirming consistency.
Contribution
It provides a detailed boundary state analysis of D-branes in type I string theory and establishes the stability and interaction properties of non-BPS configurations.
Findings
Only D-particle and D-instanton are stable non-BPS states.
Interactions of non-BPS D-particles match dual heterotic states.
Complete agreement between gauge and gravitational interactions.
Abstract
We review the boundary state description of D-branes in type I string theory and show that the only stable non-BPS configurations are the D-particle and the D-instanton. We also compute the gauge and gravitational interactions of the non-BPS D-particles and compare them with the interactions of the dual non-BPS states of the heterotic string, finding complete agreement.
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