Electrostatic solitons in unmagnetized hot electron–positron–ion plasmas

Mahmood, S.; Ur‐Rehman, Hafeez

doi:10.1016/j.physleta.2009.04.050

Cited by 40 publications

(24 citation statements)

References 24 publications

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“…On the other hand, a great deal of attention has been devoted to the study of different types of collective processes and instabilities in electron-positron-ion (EPI) plasmas (Verga and Ferro Fontán 1984;Shukla et al 1986;Rizzato 1988;Tajima and Taniuti 1990;Popel et al 1995;Jammalamadaka et al 1996;Nejoh 1996;Lakhina and Verheest 1997;El-Taibany et al 2008;Tribeche et al 2009;Pakzad 2009;Mahmood and Ur-Rehman 2009;Tribeche 2010;El-Shamy and El-Bedwehy 2010;Alinejad 2010;ElBedwehy and Moslem 2011). It is well known that when positrons are introduced into electron-ion plasma the response of the latter changes significantly.…”

Section: Introductionmentioning

confidence: 99%

Positron acoustic solitary waves interaction in a four-component space plasma

El-Shamy

El-Taibany

El-Shewy

et al. 2011

Astrophys Space Sci

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Section: Introductionmentioning

confidence: 99%

Positron acoustic solitary waves interaction in a four-component space plasma

El-Shamy

El-Taibany

El-Shewy

et al. 2011

Astrophys Space Sci

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“…It is found that in the presence of stationary ions in degenerate e-p plasmas both fast Langmuir and slow acoustic waves can propagate like in classical pair plasmas. [42][43][44][45] In classical pairion plasmas, the difference in temperature occurs due to different charging processes of positive and negative ions. 46 In classical e-p plasmas, electron and positron species can have different temperatures with different thermal energies to produce fast Langmuir and slow acoustic waves because density and Fermi temperature are not correlated with each other 44 like in degenerate e-p plasmas.…”

Section: Discussionmentioning

confidence: 99%

“…͑10͒, the +ve and Ϫve sign give fast Langmuir and slow acoustic waves in unmagnetized e-p-i quantum plasma like in classical plasma, [42][43][44] where…”

Section: Linear Analysismentioning

confidence: 99%

Electrostatic soliton and double layer structures in unmagnetized degenerate pair plasmas

2010

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The acoustic solitons and double layers are studied in unmagnetized quantum electron-positron plasmas in the presence of stationary ions. The quantum hydrodynamic model is employed and reductive perturbation method is used to derive the Korteweg–de Vries (KdV) and extended KdV equations for solitons and double layers, respectively. It is found that in the linear limit both slow acoustic and fast Langmuir waves can propagate in such type of quantum plasmas like in classical pair-ion or pair plasmas. The amplitude and width of the electrostatic solitons are found to be decreasing with the increase in concentration of positrons (or decrease in the concentration of ions) in degenerate electron-positron-ion plasmas. It is found that only rarefactive double layer can exist in such plasmas which depend on various parameters. The dependence of double layer structure on ion concentration and quantum diffraction effects of electrons and positrons are also discussed. The results are also elaborated graphically by considering dense plasma parameters in the outer layers of astrophysical objects such as white dwarfs and neutron stars.

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“…is the acoustic speed in pair plasma, 16,42 the wave frequency ω is normalized by electron/positron cyclotron frequency Ω = eB 0 /mc and the wave number k by inverse electron/ positron inertial length λ s = c/ω p . The dispersion relation (Eq.…”

Section: Model Equations and Linear Wave Analysismentioning

confidence: 99%

Fast magnetohydrodynamic cnoidal waves and solitons in electron-positron plasma

et al. 2018

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Linear and nonlinear propagation of fast magnetohydrodynamic waves (or magnetoacoustic waves) are studied in homogeneous, magnetized and warm collisionless electron-positron (e-p) plasma by using two fluid magnetohydrodynamic model. In the linear limit, the wave dispersion relation is obtained and wave dispersion effect which appears through inertial length in e-p plasma system is also discussed. Using reductive perturbation method, the Korteweg-de Vries (KdV) equation for small but finite wave amplitude of magnetoacoustic waves is derived with appropriate boundary conditions. The cnoidal wave and soliton solutions are obtained using well known Sagdeev potential approach for magnetoacoustic waves in e-p plasmas propagating in the direction perpendicular to the external magnetic field. The phase portrait analysis and numerical illustration of magnetoacoustic cnoidal waves and solitons is also presented by using the parameters such as magnetic field intensity, plasma density and temperature of electron and positron fluids for astrophysical plasma situations exist in the literature.

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Electrostatic solitons in unmagnetized hot electron–positron–ion plasmas

Cited by 40 publications

References 24 publications

Positron acoustic solitary waves interaction in a four-component space plasma

Positron acoustic solitary waves interaction in a four-component space plasma

Electrostatic soliton and double layer structures in unmagnetized degenerate pair plasmas

Fast magnetohydrodynamic cnoidal waves and solitons in electron-positron plasma

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