On the filamentation instability in degenerate relativistic plasmas

Goshadze, R.M.; Berezhiani, V. I.; Osmanov, Z.

doi:10.1016/j.physleta.2018.12.030

Cited by 8 publications

(6 citation statements)

References 20 publications

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“…[4,5] and references therein). Since the generation of high density plasma is presumably augmented by production of intense pulses of X-and Gamma-rays, several authors have also investigated modulational interactions of such high frequencey (HF) waves with variety of plasma modes [6][7][8][9][10][11][12][13]. It was argued that the observed radiation coming from the compact astrophysical objects (harboring multi species plasma) could carry footprints/information from nonlinear interactions like, for instance, the wave self-modulation and soliton formation.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear coupling of electromagnetic and electron acoustic waves in multi-species degenerate astrophysical plasma

2020

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Nonlinear wave-coupling is studied in a multi-species degenerate astrophysical plasma consisting of two electron species (at different temperatures): a highly degenerate main component plus a smaller classical relativistic flow immersed in a static neutralizing ion background. It is shown that the high frequency electromagnetic (HF EM) waves, through their strong nonlinear interactions with the electron-acoustic waves (sustained by a multi-electron component (degenerate) plasma surrounding a compact astrophysical object) can scatter to lower frequencies so that the radiation observed faraway will be spectrally shifted downwards. It is also shown that, under definite conditions, the EM waves could settle into stationary Solitonic states. It is expected that the effects of such structures may persist as detectable signatures in forms of modulated micro-pulses in the radiation observed far away from the accreting compact object. Both these effects will advance our abilities to interpret the radiation coming out of the compact objects.

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Section: Introductionmentioning

confidence: 99%

Nonlinear coupling of electromagnetic and electron acoustic waves in multi-species degenerate astrophysical plasma

2020

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“…As it has been shown in 18 the dynamics of relativistic EM beams propagating in a degenerate electron plasma can be described by the set of nonlinear equations which in a dimensionless form reads:…”

Section: Main Considerationmentioning

confidence: 99%

“…Recently the linear regime of the filamentation instability of the electromagnetic beam was investigated in a highly relativistic electron plasma 18 . As it was found, the instability arises in a weakly as well as strongly relativistic plasma.…”

Section: Introductionmentioning

confidence: 99%

“…Since in the electron-positron plasmas charge separation does not occur, the governing set of equations reduce to a single equation with saturated non-linearity for a vector potential in parabolic approximation describing dynamics of the EM beam. In contrast, in electron plasmas the governing equations reduce to a couple of non-linear equations derived in 18 .…”

Section: Introductionmentioning

confidence: 99%

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Solitary structure formation and self-guiding of electromagnetic beam in highly degenerate electron plasma

Berezhiani,

Osmanov,

Mahajan

et al. 2021

Preprint

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In the present paper we consider the nonlinear interaction of high frequency intense electromagnetic (EM) beam with degenerate electron plasmas. In a slowly varying envelop approximation the beam dynamics is described by the couple of nonlinear equations for the vector and scalar potentials. Numerical simulations demonstrate that for an arbitrary level of degeneracy the plasma supports existence of axially symmetric 2D solitons which are stable against small perturbations. The solitons exist if the power trapped in the structures, being the growing function of soliton amplitude, is above a certain critical value but below the value determining by electron cavitation. The robustness of obtained soliton solutions was verified by simulating the dynamics of initial Gaussian beams with parameters close to the solitonic ones. After few diffraction lengths the beam attains the profile close to the profile of the ground state soliton and propagates for a long distance without detectable distortion. The simulations have been performed for the input Gaussian beams with parameters far from ground state solutions. It is shown that the beam parameters are oscillating near the parameters of the ground soliton solution and thus the formation of oscillating waveguide structures takes place.

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“…Different aspects of EM radiation propagating in highly degenerate electron-ion as well as e-p plasma has been investigated in a series of papers (Berezhiani et al 2021;Goshadze et al 2019;Berezhiani et al 2015;Haas & Kourakis 2015;Mikaberidze et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic vortex beam dynamics in degenerate electron-positron astrophysical plasmas

Berezhiani,

Osmanov,

Mikeladze

2021

Preprint

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On the filamentation instability in degenerate relativistic plasmas

Cited by 8 publications

References 20 publications

Nonlinear coupling of electromagnetic and electron acoustic waves in multi-species degenerate astrophysical plasma

Nonlinear coupling of electromagnetic and electron acoustic waves in multi-species degenerate astrophysical plasma

Solitary structure formation and self-guiding of electromagnetic beam in highly degenerate electron plasma

Electromagnetic vortex beam dynamics in degenerate electron-positron astrophysical plasmas

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