12-23 July 2021
Online
Europe/Berlin timezone

Magnetic field generation by the first cosmic rays

12 Jul 2021, 18:00
1h 30m
03

03

Talk CRI | Cosmic Ray Indirect Discussion

Speaker

Yutaka Ohira (The University of Tokyo)

Description

We recently proposed that cosmic rays are first accelerated at the redshift of z~ 20 by supernova remnants of first stars without the large scale magnetic field. In this talk, we are going to talk about the large scale magnetic field generation by the first cosmic rays. We show that even though the current and charge neutralities are initially satisfied, the current neutrality is eventually violated if there is an inhomogeneity, so that the magnetic field is generated. In addition, we propose a new driving mechanism for the Biermann battery in an inhomogeneous plasma with streaming cosmic rays. We demonstrate the new generation mechanisms of the magnetic field by conducting three-fluid plasma simulations and particle in cell simulation. We propose that the first cosmic rays generate the magnetic field with a large scale at the redshift of z~20.

Keywords

Generation of magnetic fields, effects of cosmic rays

Subcategory Theoretical Results

Primary author

Yutaka Ohira (The University of Tokyo)

Presentation Materials

There are no materials yet.