Hairpin Branes and D-Branes Behind the Horizon

TL;DR

This paper investigates the behavior of Lorentzian D-particles in specific string theory backgrounds, revealing how their trajectories behind black hole horizons can be interpreted and suggesting a matrix model construction.

Contribution

It introduces a novel analysis of D-particle trajectories behind black hole horizons and proposes a new approach to matrix model construction for Lorentzian black holes.

Findings

D-particle trajectories are smeared by stringy corrections.

Behind the horizon, D-particles appear as ghost particles to an observer.

A potential matrix model for Lorentzian black holes is suggested.

Abstract

We study Lorentzian D-particles in linear dilaton and the two dimensional black hole backgrounds. The D-particle trajectory follows an accelerated trajectory which is smeared by stringy corrections. For the black hole background we find that the portion of the trajectory behind the horizon appears to an asymptotic observer as ghost D-particle. This suggests a way of constructing a matrix model for the Lorentzian black hole background.