Abstract— A theoretical investigation is carried out for understanding the properties of electron acoustic solitary waves and double layers in an unmagnetized plasma whose constituents are cold electron fluid, hot electrons obeying Tsallis distribution and stationary ions. The Sagdeev potential approach is employed to carry out the analysis. The amplitude and nature of electron-acoustic solitary waves (EASWs) and electron-acoustic double layers (EADLs) are found to be extremely sensitive to the degree of nonextensivity. It is found that the present plasma model supports only rarefactive solitons and double layers depending on the q nonextensive parameter. The investigation shows that solitary structure ceases to exist when the parameter q crosses a certain limit.
Keywords— Electron acoustic wave, Solitons, Double layer, Tsallis distribution.
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