Zobrazeno 1 - 10
of 52
pro vyhledávání: '"Shalaby, Mohamad"'
Autor:
Shalaby, Mohamad
Energy dissipation in collisionless shocks is a key mechanism in various astrophysical environments. Its non-linear nature complicates analytical understanding and necessitate Particle-in-Cell (PIC) simulations. This study examines the impact of redu
Externí odkaz:
http://arxiv.org/abs/2412.03530
Cosmic ray (CR) feedback is critical for galaxy formation as CRs drive galactic winds, regularize star formation in galaxies, and escape from active galactic nuclei to heat the cooling cores of galaxy clusters. The feedback strength of CRs depends on
Externí odkaz:
http://arxiv.org/abs/2406.04400
We study the underlying physics of cosmic-ray (CR) driven instabilities that play a crucial role for CR transport across a wide range of scales, from interstellar to galaxy cluster environments. By examining the linear dispersion relation of CR-drive
Externí odkaz:
http://arxiv.org/abs/2305.18050
The particle-in-cell (PIC) method is successfully used to study magnetized plasmas. However, this requires large computational costs and limits simulations to short physical run-times and often to setups in less than three spatial dimensions. Traditi
Externí odkaz:
http://arxiv.org/abs/2301.04679
Thermal electrons cannot directly participate in the process of diffusive acceleration at electron-ion shocks because their Larmor radii are smaller than the shock transition width: this is the well-known electron injection problem of diffusive shock
Externí odkaz:
http://arxiv.org/abs/2202.05288
Cosmic ray (CR)-driven instabilities play a decisive role during particle acceleration at shocks and CR propagation in galaxies and galaxy clusters. These instabilities amplify magnetic fields and modulate CR transport so that the intrinsically colli
Externí odkaz:
http://arxiv.org/abs/2010.11197
Autor:
Shalaby, Mohamad, Broderick, Avery E., Chang, Philip, Pfrommer, Christoph, Puchwein, Ewald, Lamberts, Astrid
We study the longitudinal stability of beam-plasma systems in the presence of a density inhomogeneity in the background plasma. Previous works have focused on the non-relativistic regime where hydrodynamical models are used to evolve pre-existing Lan
Externí odkaz:
http://arxiv.org/abs/2003.02849
Autor:
Broderick, Avery E., Tiede, Paul, Chang, Philip, Lamberts, Astrid, Pfrommer, Christoph, Puchwein, Ewald, Shalaby, Mohamad, Werhahn, Maria
An intergalactic magnetic field stronger than $3\times10^{-13}$~G would explain the lack of a bright, extended degree-scale, GeV-energy inverse Compton component in the gamma-ray spectra of TeV-blazars. A robustly predicted consequence of the presenc
Externí odkaz:
http://arxiv.org/abs/1808.02959
Autor:
Shalaby, Mohamad, Broderick, Avery E., Chang, Philip, Pfrommer, Christoph, Lamberts, Astrid, Puchwein, Ewald
We explore how inhomogeneity in the background plasma number density alters the growth of electrostatic unstable wavemodes of beam plasma systems. This is particularly interesting for blazar-driven beam-plasma instabilities, which may be suppressed b
Externí odkaz:
http://arxiv.org/abs/1804.05071
Autor:
Shalaby, Mohamad, Broderick, Avery E., Chang, Philip, Pfrommer, Christoph, Lamberts, Astrid, Puchwein, Ewald
Many astrophysical plasmas are prone to beam-plasma instabilities. For relativistic and dilute beams, the {\it spectral} support of the beam-plasma instabilities is narrow, i.e., the linearly unstable modes that grow with rates comparable to the maxi
Externí odkaz:
http://arxiv.org/abs/1704.00014