Relativistic Generalization of the Landau Criterion as a New Foundation of the Vavilov-Cherenkov Radiation Theory

Chefranov, S. G.

doi:10.1103/physrevlett.93.254801

Cited by 12 publications

(5 citation statements)

References 27 publications

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“…Of interest is also the possibility of establishing a correlation between the scaling law −8/3 observed in the turbulent spectra of the cosmic plasma in the solar wind and magnetosheath (Passot & Sulem 2015;Chefranov & Chefranov 2021) and the similar exponent of the turbulent spectrum of fluctuations in the density of particles of CRs obtained in this work, and also with a similar spectrum of −8/3, characteristic of fluctuations in the intensity of the surface earth electric field (Anisimov et al 2002). It is of interest to further use the obtained exact solutions in the theory of turbulence and in the new theory of Vavilov-Cherenkov radiation (Chefranov 2004(Chefranov , 2012(Chefranov , 2016 to analyze the problems of describing such turbulence and to consider the mechanism of acceleration of CR particles and their origin. In our paper, it is also shown that shock waves can spontaneously form in a medium consisting of CR particles, which, like shock waves arising from the explosion of supernovae, can cause additional particle acceleration.…”

Section: Discussionsupporting

confidence: 78%

Cosmic Rays Self-arising Turbulence with Universal Spectrum −8/3

Chefranov

Голицын

2023

ApJ

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In the inertial subrange of scales, an exact compressible turbulence universal spectrum law −8/3 for the density fluctuations of cosmic rays (CRs) in the frame of the known two-fluid model of CR dynamics is obtained. It is shown that the origin of this scaling law may be due to the arising of shocks at the breaking of the nonlinear simple waves of CRs near the scale of their Larmor’s radii, as it is well known for the solar wind with the same turbulent spectrum law −8/3. The consistency of the turbulence spectrum −8/3 of CRs with the observed nonthermal differential energy distribution of CRs with a similar index −8/3 due to the possibility of self-reacceleration of the CRs on the self-arising shocks is stated. The turbulent diffusion mechanism for the observed CRs energy spectrum breaks is considered.

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Section: Discussionsupporting

confidence: 78%

Cosmic Rays Self-arising Turbulence with Universal Spectrum −8/3

Chefranov

Голицын

2023

ApJ

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“…The given example of instability broadens the range of physical problems where a similar phenomenon of dissipative instability was studied earlier and led to a new comprehension of the corresponding phenomena basic mechanisms [16,28,29]. Considered is the application of the theory conclusions when the instability region (6.2) derived from condition (1.3) for a shock wave in real gases and fluids is obtained on the basis of the shock adiabat explicit form (6.1).…”

Section: Discussionmentioning

confidence: 92%

Dissipative Instability of Shock Waves

Chefranov

2020

J. Exp. Theor. Phys.

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A new condition for the linear dissipative instability of the strong plane shock wave in an arbitrary medium is obtained. The instability of the shock is realized due to the flow instability behind its front, which is similar to the known dissipative instability in the boundary layer for the Tollmien-Schlichting waves. It is found that within the limit of low viscosity the one-dimensional longitudinal disturbances grow much faster than the two-dimensional corrugation ones. It points to a better correspondence to experiment of the new condition for the absolute instability of the shock in comparison with the S.P. D'yakov classical theory (1954), which does not take viscosity into account.

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“…We established that the Cherenkov-like thermal waves propagate under the self-propulsion. Geometric characteristics of the Cherenkov thermal cone (triangle) are governed by the inter-relation between the velocity of self-propulsion and the velocity of capillary waves. ,,, The effect is observed for the liquid marbles moving with a velocity larger than the threshold value of . Self-propulsion of liquid marbles generates soluto- and thermo-capillary surface flows.…”

Section: Discussionmentioning

confidence: 99%

Cherenkov-Like Surface Thermal Waves Emerging from Self-Propulsion of a Liquid Marble

et al. 2020

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We explore the thermal field related to the self-propulsion of floating liquid marbles filled with aqueous ethanol. Cherenkov-like thermal waves arising from self-propulsion are registered. The opening angle of the thermal field Cherenkov triangle is governed by the inter-relation between the velocity of self-propulsion and the phase velocity of the capillary waves. The self-propulsion is driven by soluto-capillarity accompanied by thermo-capillarity. A semiquantitative analysis of the effect is presented. The empirical selection rule for capillary waves responsible for the mass, momentum, and heat transfer is outlined. The soluto-capillarity leads to much stronger spatial variations of the surface tension than the thermo-capillarity.

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Relativistic Generalization of the Landau Criterion as a New Foundation of the Vavilov-Cherenkov Radiation Theory

Cited by 12 publications

References 27 publications

Cosmic Rays Self-arising Turbulence with Universal Spectrum −8/3

Cosmic Rays Self-arising Turbulence with Universal Spectrum −8/3

Dissipative Instability of Shock Waves

Cherenkov-Like Surface Thermal Waves Emerging from Self-Propulsion of a Liquid Marble

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