@article{f9a3cc6e733843d493f44dd6c978bae7,
title = "Coexistence of negative and positive polarity electrostatic solitary waves in ultradense relativistic negative-ion-beam permeated plasmas",
abstract = "The criteria for occurrence and the dynamical features of electrostatic solitary waves in a homogeneous, unmagnetized ultradense plasma penetrated by a negative ion beam are investigated, relying on a quantum hydrodynamic model. The ionic components are modeled as inertial fluids, while the relativistic electrons obey Fermi-Dirac statistics. A new set of exact analytical conditions for localized solitary pulses to exist is obtained, in terms of plasma density. The algebraic analysis reveals that these depend sensitively on the negative ion beam characteristics, that is, the beam velocity and density. Particular attention is paid to the simultaneous occurrence of positive and negative potential pulses, identified by their respective distinct ambipolar electric field structure forms. It is shown that the coexistence of positive and negative potential pulses occurs in a certain interval of parameter values, where the ion beam inertia becomes significant.",
author = "Elkamash, {I. S.} and I. Kourakis",
note = "Funding Information: The authors acknowledge the support from the EU-FP7 IRSES Programme (Grant No. 612506 QUANTUM PLASMAS FP7-PEOPLE-2013-IRSES). We warmly acknowledge a series of inspiring interactions with Dr. Fernando Haas, during our respective visits to Instituto de F{\'i}sica, Universidade Federal do Rio Grande do Sul (Porto Alegre, Brazil). The authors express their gratitude for the hospitality provided by the Institute of Theoretical Physics (IFT) at the State University of Sao Paulo (UNESP— Universidade Estadual Paulista) and Professor Roberto Kraenkel in particular where the latter stages of this work were carried out. I.K. is grateful for support from the Foundation for Research Support of the State of S{\~a}o Paulo (FAPESP), in the form of a Visiting Researcher fellowship, during the same period. Finally, one of us (ISE) acknowledges financial support via an Egyptian government fellowship. Publisher Copyright: {\textcopyright} 2018 Author(s).",
year = "2018",
month = may,
day = "1",
doi = "10.1063/1.5024519",
language = "British English",
volume = "25",
journal = "Physics of Plasmas",
issn = "1070-664X",
publisher = "American Institute of Physics",
number = "5",
}