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Plasma instabilities of tev pair beams induced by blazars

Record Type:	Electronic resources : Monograph/item
Title/Author:	Plasma instabilities of tev pair beams induced by blazars by Mahmoud S. A. Alawashra.
Author:	Alawashra, Mahmoud S. A.
Published:	Cham :Springer Nature Switzerland :2025.
Description:	xxiii, 118 p. :ill., digital ;24 cm.
Notes:	"Doctoral thesis accepted by Institute of Physics and Astronomy, University of Potsdam, Potsdam, Germany."
Contained By:	Springer Nature eBook
Subject:	Plasma instabilities.
Online resource:	https://doi.org/10.1007/978-3-031-98568-3
ISBN:	9783031985683$q(electronic bk.)

Plasma instabilities of tev pair beams induced by blazars
Alawashra, Mahmoud S. A.

Plasma instabilities of tev pair beams induced by blazars [electronic resource] /by Mahmoud S. A. Alawashra. - Cham :Springer Nature Switzerland :2025. - xxiii, 118 p. :ill., digital ;24 cm. - Springer theses,2190-5061. - Springer theses..

"Doctoral thesis accepted by Institute of Physics and Astronomy, University of Potsdam, Potsdam, Germany."

Introduction -- Observational Context -- Exploring the Foundations of Beam-Plasma Instability -- IGMF impact on the Beam-Plasma Instability -- Fokker-Planck Diffusion Simulation of the Instability Feedback -- Conclusions and Outlook.

This thesis develops a new theory combining the beam-plasma instability and IGMF in one picture. Recently, it was observed that the expected cascade emission of gamma rays in the TeV range from some distant blazars is not seen in their spectra. The underlying physical processes are well known, and a failure of the model predictions would shake the foundations of modern physics unless a credible explanation for this failure is found. One could argue that a femto-Gauss strong magnetic field in the cosmic voids would disperse the cascade emission, although the question remains as to how this magnetic field was generated. Mahmoud Alawashra provides us with a carefully crafted assessment of a second possibility, namely, energy loss due to plasma instabilities in the cosmic voids. His first point is: what if there is a weak magnetic field? It might not dilute the cascade emission but suppress the beam-plasma instabilities, ruling out an intermediate range of magnetic field amplitudes where neither scenario works. Mahmoud's study is the first in the literature to combine instability and IGMF in one picture. Authors then investigated the nonlinear feedback of the instability and finds it in a quasi-steady state where the energy loss of the cascades is weak. The whole study is simply outstanding and combines analytical skills with numerical ability.

ISBN: 9783031985683$q(electronic bk.)

Standard No.: 10.1007/978-3-031-98568-3doiSubjects--Topical Terms:

1004050
Plasma instabilities.

LC Class. No.: QC718.5.S7 / A43 2025

Dewey Class. No.: 530.442

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520 $a This thesis develops a new theory combining the beam-plasma instability and IGMF in one picture. Recently, it was observed that the expected cascade emission of gamma rays in the TeV range from some distant blazars is not seen in their spectra. The underlying physical processes are well known, and a failure of the model predictions would shake the foundations of modern physics unless a credible explanation for this failure is found. One could argue that a femto-Gauss strong magnetic field in the cosmic voids would disperse the cascade emission, although the question remains as to how this magnetic field was generated. Mahmoud Alawashra provides us with a carefully crafted assessment of a second possibility, namely, energy loss due to plasma instabilities in the cosmic voids. His first point is: what if there is a weak magnetic field? It might not dilute the cascade emission but suppress the beam-plasma instabilities, ruling out an intermediate range of magnetic field amplitudes where neither scenario works. Mahmoud's study is the first in the literature to combine instability and IGMF in one picture. Authors then investigated the nonlinear feedback of the instability and finds it in a quasi-steady state where the energy loss of the cascades is weak. The whole study is simply outstanding and combines analytical skills with numerical ability.
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