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Abstract
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More recently, Roy et al. [Phys. Plasmas 19, 033705 (2012)] have investigated the occurrence of
nonlinear solitary and double-layers in an ultrarelativistic dusty electron-positron-ion degenerate
plasma using a Sagdeev potential method. They have considered a full parametric examination on
Mach-number criteria for existence of such nonlinear excitations using the specific degeneracy
limits of Chandrasekhar equation of state (EoS) for Fermi-Dirac plasmas. In this comment, we
point-out a misleading extension of polytropic EoS to study the Fermi-Dirac relativistically
degenerate plasmas.
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