https://doi.org/10.1140/epjd/s10053-025-00988-x
Regular Article - Plasma Physics
Impact of temperature anisotropy on longitudinal and transverse wave dynamics in unmagnetized partially degenerate electron plasmas
Department of Physics, Government College University, 54000, Lahore, Pakistan
Received:
15
November
2024
Accepted:
23
March
2025
Published online:
4
May
2025
Thermal temperature anisotropy plays a crucial role in the spectral analysis of waves in both laboratory and space plasmas, particularly when finite temperature effects are important. Using the linearized Vlasov–Maxwell model, we derive the dispersion relations for both longitudinal and transverse modes in an anisotropic, collisionless, homogeneous electron plasma, incorporating arbitrary levels of temperature degeneracy through the Fermi–Dirac distribution. The response functions are expressed in terms of the plasma dispersion function adapted for the Fermi–Dirac distribution. Our results are further approximated using asymptotic expansions and series approximations of the plasma dispersion function. The analysis shows that thermal anisotropy has a more significant influence on the frequency spectrum in weakly degenerate plasma regions compared to highly degenerate ones. The derived results have broad applicability, extending from laboratory conditions to astrophysical plasmas.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
