D-brane Bremsstrahlung

TL;DR

This paper investigates how ultrarelativistic D-branes lose energy rapidly through bremsstrahlung radiation of massless closed strings, significantly affecting their dynamics in cosmological inflation scenarios.

Contribution

It characterizes bremsstrahlung from extended objects and incorporates D-brane specific effects, revealing their impact on D-brane dynamics during inflation.

Findings

Bremsstrahlung causes rapid energy loss in ultrarelativistic D-branes.

Dissipation from bremsstrahlung can significantly modify D-brane inflation dynamics.

Inclusion of velocity-dependent forces and open string pair creation effects.

Abstract

We study the dynamics of ultrarelativistic D-branes. The dominant phenomenon is bremsstrahlung: mild acceleration induced by closed string interactions triggers extremely rapid energy loss through radiation of massless closed strings. After characterizing bremsstrahlung from a general k-dimensional extended object in a D-dimensional spacetime, we incorporate effects specific to D-branes, including velocity-dependent forces and open string pair creation. We then show that dissipation due to bremsstrahlung can substantially alter the dynamics in DBI inflation.