Vortex driven Schwingrer pair creation in the magnetosphere of SgrA*
Zaza N. Osmanov
TL;DR
This paper addresses Schwinger pair creation in the magnetosphere of Sgr A* by proposing a vortex-driven magnetic field that amplifies magneto-centrifugal acceleration. The authors show that charge separation excites Langmuir modes and drives the electrostatic field toward the Schwinger threshold $E_S$ (where $E_S = \pi m_e^2 c^3/(e \hbar) \simeq 1.4\times 10^{14}$ statV cm$^{-1}$), triggering rapid $e^+e^-$ production and saturation via annihilation processes. Under vortex fields, electrons and protons attain extremely high Lorentz factors ($\gamma_e \sim 1.6\times10^{10}$, $\gamma_p \sim 2.8\times10^{11}$), and Langmuir instabilities grow on sub-millisecond timescales ($\tau \sim 5\times10^{-4}$ s), yielding pair densities up to $n \sim 3\times10^{18}$ cm$^{-3}$ and production rates around $R \sim 1.2\times10^{23}$ cm$^{-3}$ s$^{-1}$, with annihilation setting the ultimate saturation. Potential observational signatures include Doppler-shifted annihilation lines in the MeV range and magnetospheric heating, though dust absorption poses detection challenges. The work highlights a highly efficient channel for pair creation in supermassive black hole environments and motivates targeted observational strategies.
Abstract
In this work, we explore the possibility of Schwinger pair creation triggered by magneto-centrifugal effects in the magnetosphere of SgrA*. We show that these effects become extremely efficient in the presence of a vortex-driven magnetic field, whose strength exceeds previous estimates by several orders of magnitude. The dynamics of magneto-centrifugally accelerated charged particles leads to charge separation, thereby parametrically exciting Langmuir waves. The associated electric field grows exponentially and upon reaching the Schwinger critical threshold, initiates efficient electron-positron pair production, which is ultimately saturated by annihilation processes.