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Effect of superthermal electrons on the quantum electron acoustic double layers in dense astrophysical plasmas

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  • Singh, Aakanksha
  • Kumar, Punit

Abstract

Electron-acoustic double layers (EADLs) have been investigated in four component unmagnetized dense quantum plasmas consisting of stationary background ions and two electron populations, ‘cold’ and ‘hot’ with the superthermal kappa-distributed electrons. Using the quantum hydrodynamic (QHD) model and the reductive perturbation technique, a generalized Korteweg–de Vries (KdV) equation was derived, and stationary analytical solutions are obtained. The analysis revealed that superthermal electrons substantially influence the amplitude, width, and polarity of EADLs. Numerical results indicated that decreasing the spectral index κ or increasing the relative density of κ-electrons to hot electrons intensifies nonlinear effects, producing stronger compressive and rarefactive structures. It is also found that κ plays a more dominant role than density ratio in controlling EADL properties in dense astrophysical environments.

Suggested Citation

  • Singh, Aakanksha & Kumar, Punit, 2026. "Effect of superthermal electrons on the quantum electron acoustic double layers in dense astrophysical plasmas," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 685(C).
    • Handle: RePEc:eee:phsmap:v:685:y:2026:i:c:s0378437126000300
    DOI: 10.1016/j.physa.2026.131294
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