The Collisional Penrose Process

Area of Science:

• Astrophysics
• General Relativity
• Particle Physics

Background:

• The Kerr metric describes rotating black holes, featuring an ergosphere outside the event horizon.
• Roger Penrose discovered that particles in the ergosphere can have negative energy, enabling mass and angular momentum extraction from black holes.

Purpose of the Study:

• To review the history and applications of the Penrose process.
• To explore the astrophysical implications of particle collisions within the ergosphere.
• To investigate the potential of the collisional Penrose process to enhance dark matter annihilation.

Main Methods:

• Review of theoretical frameworks for energy extraction from rotating black holes.
• Analysis of particle dynamics and collisions within the ergosphere.
• Modeling of dark matter annihilation enhancement in supermassive black hole environments.

Main Results:

• Single particle decay is inefficient, but particle collisions can yield arbitrarily high center-of-mass energies.
• High-energy particles can escape the ergosphere with significant efficiency.
• The collisional Penrose process shows potential for boosting dark matter annihilation rates.

Conclusions:

• The collisional Penrose process offers a mechanism for efficient energy extraction from black holes.
• This process could serve as a probe for high-energy physics and general relativity.
• Enhanced dark matter annihilation near supermassive black holes is a promising astrophysical application.