Dynamical Formation of Horizons in Recoiling D Branes

TL;DR

This paper models how quantum recoil effects from D-brane interactions can create microscopic horizons or 'bubbles' in space-time, potentially leading to observable Lorentz symmetry violations and influencing brane dynamics.

Contribution

It introduces a toy model showing how quantum recoil induces microscopic horizons in D-brane interactions, with implications for Lorentz symmetry and brane configurations.

Findings

Quantum recoil effects create microscopic horizons in D-brane interactions.

Propagating matter inside bubbles experiences subluminal velocities.

Conformal invariance conditions favor three spatial dimensions.

Abstract

A toy calculation of string/D-particle interactions within a world-sheet approach indicates that quantum recoil effects - reflecting the gravitational back-reaction on space-time foam due to the propagation of energetic particles - induces the appearance of a microscopic event horizon, or `bubble', inside which stable matter can exist. The scattering event causes this horizon to expand, but we expect quantum effects to cause it to contract again, in a `bounce' solution. Within such `bubbles', massless matter propagates with an effective velocity that is less than the velocity of light in vacuo, which may lead to observable violations of Lorentz symmetry that may be tested experimentally. The conformal invariance conditions in the interior geometry of the bubbles select preferentially three for the number of the spatial dimensions, corresponding to a consistent formulation of the interaction of D3 branes with recoiling D particles, which are allowed to fluctuate independently only on the D3-brane hypersurface.