Coherent nonlinear structures in dense electron—positron plasma

Khan, S. A.; Wazir, Z.

doi:10.1088/1674-1056/22/2/025201

Cited by 5 publications

(4 citation statements)

References 38 publications

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“…In the context of dense astrophysical plasmas, many researchers have investigated nonlinear wave propagation in degenerate e-p [29][30][31] as well as e-p-i [9,24,32,33] plasmas with various insights. Rahman et al [24,33] studied both linear and nonlinear ion-acoustic waves in relativistic degenerate e-p-i plasma with relevance to dense astrophysical objects like white dwarfs.…”

Section: Introductionmentioning

confidence: 99%

Solitary kinetic Alfvén waves in dense plasmas with relativistic degenerate electrons and positrons

Ahmed¹,

Sah²

2019

Plasma Sci. Technol.

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Propagation of solitary kinetic Alfvén waves (KAWs) is investigated in small but finite b (particle-to-magnetic pressure ratio) collisionless dense plasma whose constituents are nondegenerate warm ions, and relativistic degenerate electrons and positrons. Through the use of reductive perturbation technique, Kortweg-de Vries equation is derived to obtain small amplitude localized wave solution of KAWs. The effects of plasma , b positron concentration, electron relativistic degeneracy parameter, ion thermal temperature and obliqueness parameter on solitary KAWs are studied. The results of this theoretical investigation are aimed at elucidating characteristics of kinetic Alfvén solitary waves in relativistic degenerate e-p-i plasmas found in dense astrophysical objects specifically neutron stars and white dwarfs.

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Section: Introductionmentioning

confidence: 99%

Solitary kinetic Alfvén waves in dense plasmas with relativistic degenerate electrons and positrons

Ahmed¹,

Sah²

2019

Plasma Sci. Technol.

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“…Dense electron-positron pairs are demonstrated to be in the early universe, in solar atmosphere, and in inertial confinement fusion schemes using ultra-intense lasers. [1][2][3] One expects to uncover some mysteries of the universe by studying dense pair plasma state created via laser-plasma interactions in the laboratory. [4] For example, ultra-bright gamma ray burst is generally accepted as arising from synchrotron emission of relativistic shocks in pair plasmas.…”

Section: Introductionmentioning

confidence: 99%

Dense pair plasma generation by two laser pulses colliding in a cylinder channel

Liu

et al. 2017

Chinese Phys. B

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An all-optical scheme for high-density pair plasmas generation is proposed by two laser pulses colliding in a cylinder channel. Two dimensional particle-in-cell simulations show that, when the first laser pulse propagates in the cylinder, electrons are extracted out of the cylinder inner wall and accelerated to high energies. These energetic electrons later run into the second counter-propagating laser pulse, radiating a large amount of high-energy gamma photons via the Compton back-scattering process. The emitted gamma photons then collide with the second laser pulse to initiate the Breit-Wheeler process for pairs production. Due to the strong self-generated fields in the cylinder, positrons are confined in the channel to form dense pair plasmas. Totally, the maximum density of pair plasmas can be 4.60 × 10 27 m −3 , for lasers with an intensity of 4 × 10 22 W•cm −2 . Both the positron yield and density are tunable by changing the cylinder radius and the laser parameters. The generated dense pair plasmas can further facilitate investigations related to astrophysics and particle physics.

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“…[41] The nonlinear solitary waves and shock waves were studied in relativistically degenerate electrons and positrons plasmas. [42][43][44][45] Accordingly in the present paper, we study the QIAWs in unmagnetized plasmas consisting of positive and negative ions as well as inertialess relativistically degenerate electrons and positrons. Here the ions are considered to be classical and inertial, while the electrons and positrons are treated as being inertialess, which will be considered as weakly relativistically degenerate plasma or an ultrarelativistic one.…”

Section: Introductionmentioning

confidence: 99%

Relativistic degenerate effects of electrons and positrons on modulational instability of quantum ion acoustic waves in dense plasmas with two polarity ions

Liu¹,

Wang²,

Yan-Zhen³

2015

Chinese Phys. B

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The nonlinear propagation of quantum ion acoustic wave (QIAW) is investigated in a four-component plasma composed of warm classical positive ions and negative ions, as well as inertialess relativistically degenerate electrons and positrons. A nonlinear Schrödinger equation is derived by using the reductive perturbation method, which governs the dynamics of QIAW packets. The modulation instability analysis of QIAWs is considered based on the typical parameters of the white dwarf. The results exhibit that both in the weakly relativistic limit and in the ultrarelativistic limit, the modulational instability regions are sensitively dependent on the ratios of temperature and number density of negative ions to those of positive ions respectively, and on the relativistically degenerate effect as well.

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Coherent nonlinear structures in dense electron—positron plasma

Cited by 5 publications

References 38 publications

Solitary kinetic Alfvén waves in dense plasmas with relativistic degenerate electrons and positrons

Solitary kinetic Alfvén waves in dense plasmas with relativistic degenerate electrons and positrons

Dense pair plasma generation by two laser pulses colliding in a cylinder channel

Relativistic degenerate effects of electrons and positrons on modulational instability of quantum ion acoustic waves in dense plasmas with two polarity ions

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