The book Waves in Equilibrium and Non-Equilibrium Dispersive Media authored by Dr. Babak Shokri, Professor at the Faculty of Physics and the Laser and Plasma Research Institute of Shahid Beheshti University, has been published. This book, released for the first time in 2025 (1404 SH), comprises 519 pages in medium octavo format and is available for purchase at 4,700,000 IRR.
This comprehensive work presents the principal mathematical analytical methods and general problems in the theory of linear waves in dispersive media and systems, including non-equilibrium cases. It addresses the formulation and solutions of nth-order linear partial differential equations, along with the physical interpretation of these solutions and their practical applications. While wave theory is commonly introduced in the context of specific physical entities such as optical waves, radio waves, plasma waves, fluid waves, and acoustic waves, the book offers a mathematical perspective independent of the physical nature of the wave phenomena. One of the significant challenges in modern natural sciences is the study of non-equilibrium physical systems, where wave theory plays a secondary role, typically within key branches such as physical kinetics, plasma physics, and microwave electronics. Nevertheless, there remains a clear need for a foundational theory of waves in non-equilibrium media. In this book, the general theory of linear waves is developed as a branch of mathematical physics, describing wave dynamics in both equilibrium and non-equilibrium dispersive systems—regardless of their physical nature. The practical applications of the general theory are demonstrated using relatively simple yet important physical systems commonly studied in fields such as continuum mechanics, electrodynamics, plasma physics, and electronics.
The book also presents novel results related to non-equilibrium and resonant phenomena in quasi-plasma media, which have found practical applications in electronics and radiophysics. To illustrate the practical use of the general theory, the book provides a unified description of key physical systems typically encountered in continuum mechanics, electrodynamics, plasma physics, electronics, and physical kinetics.
Key topics covered in the book include:
- Interaction of waves in coupled systems
- Propagation and evolution of local wave disturbances and wave emission in dispersive media influenced by external sources with defined motion
- Development of a general theory of instabilities in linear systems
- Formulation and comparison of absolute and convective instability criteria
- Calculation of Green's functions for selected non-equilibrium media
- Special focus on linear electromagnetic wave theory in plasma and quasi-plasma media
This book is recommended for researchers, specialists, and postgraduate students in fields such as electrodynamics, continuum mechanics, electronic physics, and radiophysics, as well as other interested readers. For purchase, please visit the Sales Office of the Scientific Publications Center of Shahid Beheshti University, located on the ground floor of the Information Technology (IT) Building. The book can also be ordered online via the center’s website. The electronic version is available on the Fidibo and Taghche platforms.