FIZIKA A 8 (1999) 2 , 83-90

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ON THE ENVELOPE SOLITONS AND MODULATIONAL INSTABILITY IN AN ELECTRON - POSITRON PLASMA

S. BURMAN and A. ROY CHOWDHURY

High Energy Physics Division, Department of Physics, Jadavpur University, Calcutta 700 032, India

Received 23 June 1998; revised manuscript received 15 March 1999
Accepted 4 October 1999

We have studied the formation of envelope soliton in a electron-positron plasma. The deduced nonlinear Schrödinger equation yields information about the modulational instability of the system for the different ranges of the plasma parameters. It is important to note that the modulational stability depends on the positron-electron density ratio. The theory is applicable to solitary waves in space plasmas.

PACS numbers: 52.35.-g, 52.35.Sb, 02.30.Jr
UDC 531.742
Keywords: electron-positron plasma, envelope soliton, nonlinear Schrödinger equation, modulational stability, dependence on positron-electron density ratio, solitary waves in space plasmas
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