Jul 5 – 10, 2021
Europe/Rome timezone

Magnetic field screening in strong crossed electromagnetic fields

Jul 9, 2021, 7:30 AM
15m
Talk in the parallel session Strong Electromagnetic and Gravitational Field Physics: From Laboratories to Early Universe Strong Electromagnetic and Gravitational Field Physics: From Laboratories to Early Universe

Speaker

Stefano Campion (ICRANeT)

Description

We consider crossed electric and a magnetic fields $\left(\vec{B}=B\hat{z},~\vec{E}=E\hat{y}\right)$, with $E/B<1$, in presence of some initial number of $e^{\pm}$ pairs. We do not discuss here the mechanism of generation of these initial pairs. The electric field accelerates the pairs to high-energies thereby radiating high-energy synchrotron photons. These photons interact with the magnetic field via magnetic pair production process (MPP), i.e. $\gamma+B\rightarrow e^{+}+e^{-}$, producing additional pairs. We here show that the motion of all the pairs around the magnetic field lines generates a current that induces a magnetic field that shields the initial one. For instance, for an initial number of pairs $N_{\pm,0}=10^{10}$, an initial magnetic field of $10^{12}$ G can be reduced of a few percent. The screen occurs in the short timescales $10^{-21}\leq t \leq 10^{-15}$ s, i.e. before the particle acceleration timescale equals the synchrotron cooling timescale. Our results indicate that the screening of magnetic fields can be very relevant in some astrophysical systems such as pulsars and gamma-ray bursts.

Primary author

Co-authors

Jorge Armando Rueda Hernandez (ICRANet) She-Sheng Xue (ICRANet, Physics Department, Sapienza University of Rome) Prof. Remo Ruffini (ICRANet)

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