# Accelerating strangelets via Penrose process in non-BPS fuzzballs

## TL;DR

This paper explores how non-BPS fuzzball solutions in string theory can efficiently accelerate strangelets through the Penrose process, potentially explaining ultra-high-energy cosmic rays.

## Contribution

It introduces a novel analysis of the Penrose process in non-BPS fuzzball geometries, showing unbounded efficiency unlike traditional Kerr black holes.

## Key findings

- Penrose process efficiency is unbounded in non-BPS fuzzball solutions.
- Strangelets can be accelerated to ultra-high energies in these geometries.
- Potential implications for cosmic ray origins.

## Abstract

Ultra High Energy Cosmic Rays may include strangelets, a form of Strange Quark Matter, among their components. We briefly review their properties and discuss how they can be accelerated via Penrose process taking place in singular rotating Kerr black holes or in their smooth, horizonless counterparts in string theory, according to the fuzzball proposal. We focus on non-BPS solutions of the JMaRT kind and compute the efficiency of Penrose process that turns out not to be bounded unlike for Kerr BHs.