CDHY PeVatron Workshop

Session

Acceleration Theory

9 Oct 2025, 13:30

Nevis Labs, Columbia University

21. Reconnection-powered multi-messenger emission from black hole coronae

Lorenzo Sironi

09/10/2025, 13:30

We argue that magnetic reconnection—a process by which opposite field lines annihilate, releasing their energy to the plasma—plays a major role for dissipation of the available free energy in black hole magnetospheres. Inverse Compton scattering within the chain of magnetic islands / flux ropes self-consistently created by reconnection in black hole magnetospheres can power the mysterious hard...

1. Ion acceleration in 3D hybrid simulations of perpendicular shocks

Luca Orusa (Columbia University)

09/10/2025, 14:00

Plenary Early Career

Understanding the mechanisms that drive particle acceleration at collisionless, non-relativistic shocks—such as those in supernova remnants—is essential for unveiling the origin of cosmic rays. We use hybrid simulations (kinetic ions–fluid electrons) to study particle acceleration and magnetic field amplification at non-relativistic, weakly magnetized, perpendicular shocks. While no...

2. Cosmic Ray Acceleration in Turbulent Magnetized Plasmas

Luca Comisso (Columbia University)

09/10/2025, 14:20

Understanding how cosmic rays attain their very high energies remains one of the key open problems in astrophysics. In this talk, I will discuss recent progress on particle acceleration in turbulent, magnetized plasmas, focusing on environments such as magnetized winds, jets, and black hole coronae. I will present results from first-principles particle-in-cell simulations that reveal how...

37. Discussion of Acceleration Theory

Lorenzo Sironi

09/10/2025, 14:40