Relativistic and Heavy Ion Effects on Single- and Multi-Soliton Structures of Ion-Acoustic Waves

The fundamental characteristics of ion-acoustic waves (IAWs) due to the relativistic effects are investigated in a collisionless unmagnetized plasma system consisting of relativistic positively charged inertial heavy ions, kappa-distributed electrons, and Maxwellian light ions. The reductive perturbation method (RPM) is used to derive the nonlinear evolution equation like the Korteweg-de Vries (KdV) equation. The production of single-, double-, and triple-IAW solitons (IAWSs) is also investigated. It is found that for the effects of concerned parameters only rarefactive (IAWSs) are produced. The results obtained in this study are useful not only to understand the space plasma phenomena such as plasma sheet boundary layer of earth's magnetosphere, laser-plasma interaction, but also to validate the laboratory experiments.