Abstract
•The ion-acoustic structures (cnoidal and solitary waves) in a degenerate e–p–i plasma are investigated.•The basic equations are reduced to the Korteweg-de Vries (KdV) type equation and its cnoidal waves (CWs) are obtained.•The effect of relevant plasma parameters on the ion-acoustic (IA) structures is examined.
The propagation of electrostatic ion-acoustic cnoidal waves (IACWs) and solitons in a degenerated electron-positron-ion plasma with cold inertial ions and Thomas-Fermi distributed electrons and positrons is investigated. Adopting a reductive perturbation technique (RPT), the Korteweg-de Vries (KdV) equation is obtained and its cnoidal waves (CWs) solution is analyzed. The plasma configuration parameters (namely, the positron concentration and the Fermi temperature ratio of electron-to-positron) are shown to affect remarkably the dynamical characteristics of IACWs and solitons. The relevance of the present work to superdense white dwarfs is pointed out.