Vol 193, No 5 (2023)
Reviews of topical problems
Modern analytic models of acceleration and propagation of electrons in solar flares
Abstract
We review the current state of the kinetic theory of acceleration and propagation of energetic (thermal and nonthermal) electrons during solar flares. The classical models of a thick target, together with their extension to models that take the reverse current effect and the acceleration of electrons in collapsing magnetic traps into account, are discussed in detail. Analytic solutions of the corresponding kinetic equations are found and used to calculate the characteristics of the hard X-ray bremsstrahlung generated by energetic electrons. The results obtained are compared with modern high-precision data from satellite observations of solar flares. The radiation polarization degree is calculated and the prospects for its measurement in future space experiments are discussed.
Uspehi fizičeskih nauk. 2023;193(5):465-490
465-490
Dynamics and radiation of charged particles in ultra-intense laser fields
Abstract
The current state of research on high-intensity laser fields and their interaction with charged particles is reviewed. Data on petawatt-class laser facilities are presented, and advanced methods for characterizing ultra-intense laser pulses are discussed. Effects that occur in the interaction of such pulses with matter in the regime dominated by radiation friction are considered. Methods applied to describe nonlinear quantum-electrodynamic processes, including higher-order effects, are described in detail. Some theoretical results and concepts are criticized, including the predicted influence of strong laser fields on decays of nuclei and elementary particles and the concept of Unruh radiation.
Uspehi fizičeskih nauk. 2023;193(5):491-527
491-527
Bound states in the continuum in photonic structures
Abstract
Bound states in the continuum (BICs) are a striking example of how a solution to a simple problem of quantum mechanics, obtained about a century ago, can serve as an incentive to study a wide range of resonance phenomena in wave physics. Due to the giant radiative lifetime, BICs have found multiple applications in various fields of physics studying wave processes, in particular, in hydrodynamics, atomic phys„ics, and acoustics. In this review, we present a broad view of the physics of BICs and related effects, focusing primarily on photonic dielectric structures. We consider the history of the development of BIC studies, the main physical mechanisms of their formation, and specific examples of structures that can support such states. We also discuss possible practical applications of BICs in optics, photonics, and radiophysics.
Uspehi fizičeskih nauk. 2023;193(5):528-553
528-553
Instruments and methods of investigation
554-570
Personalia
In memory of Veniamin Sergeevich Berezinsky
Uspehi fizičeskih nauk. 2023;193(5):571-572
571-572
Bibliography
New books on physics and related sciences: May 2023
Uspehi fizičeskih nauk. 2023;193(5):573-574
573-574
Physics news on the Internet: May 2023
Uspehi fizičeskih nauk. 2023;193(5):575-576
575-576