Electromagnetic scattering on D3-brane spikes

TL;DR

This paper studies how electromagnetic waves interact with a D3-brane spike, revealing that the spike absorbs nearly all radiation like a black hole, with unique scattering properties relevant to string theory.

Contribution

It demonstrates that D3-brane spikes act as black hole analogs for electromagnetic waves and analyzes their distinctive scattering and absorption characteristics.

Findings

Spike absorbs almost all electromagnetic radiation at low energy.

Absorption cross section for j=1 modes tends to a constant at low energy.

Scattered radiation tends to zero, showing non-Thompson scattering behavior.

Abstract

We consider scattering of electromagnetic plane waves on a D3-brane spike which emanates normal to D3-barne in the extra space direction. We are interested in studying physical effects on D3-brane which are produced by a spike attached to D3-brane. We have observed that the spike sucks almost all electromagnetic radiation and therefore acts like a black hole. This is because absorption cross section for j=1 tends to a constant at low energy limit. This behaviour is appealing for a string interpretation of the spike soliton because the propagation of $j=1$ mode is indeed distinctive. Instead, the scattered part of the radiation on a D3-brane tends to zero demonstrating non-Thompson behaviour.