Boldrighini C., Frigio S., Pellegrinotti A., Sinai Ya.G. «An antisymmetric solution of the 3D incompressible Navier–Stokes equations with ``tornado-like'' behavior» Журнал экспериментальной и теоретической физики, 158, № 2, с. 395-398 (2020)

We consider a solution of the incompressible Navier–Stokes equations in R³, related to the singular complex solutions of Li and Sinai [e20094-LiSi08], and such that a growth of the enstrophy S(t) is expected. The computer simulations show that S(t) increases up to a time T_E (singularities are excluded by axial symmetry). They also reveal an interesting “tornado-like'' behavior, with a sharp increase of speed and vorticity in an annular region, as for some “extreme'' weather phenomena. DOI: 10.31857/S0044451020080167

Кардашёв Н.С., Новиков И.Д., Peпuн C.B. «Кротовые норы с близкими друг от друга входами» Успехи физических наук, 190, № 6, с. 664-668 (2020)

Рассматриваются теоретические и наблюдательные свидетельства для проверки выдвинутой Н.С. Кардашёвым гипотезы о том, что некоторые из двойных изображений ядер галактик могут быть входами в одну и ту же кротовую нору.

Ansari A.A., Prasad S.N. «Generalized elliptic restricted four-body problem with variable mass» Письма в Астрономический журнал: Астрономия и космическая физика, 46, № 4, с. 304 (2020)

The elliptic case of restricted four-body problem with variable mass of infinitesimal body is studied here. The three primary bodies which are placed at the vertices of an equilateral triangle and moving in the elliptical orbits around their common center of mass. Out of these primaries we have considered that one massive body is having radiating effect and other two bodies are oblate in shapes. The fourth body which have infinitesimal mass, are varying its mass according to Jeans law. We derive the equations of motion of the infinitesimal body under the generalized sense in the elliptic restricted four-body problem by using the Meshcherskii-space time transformations. Further we numerically study about the equilibrium points, Poincare surfaces of section, regions of possible motion and basins of the attracting domain by considering the variation of parameters used. Further more we examine the stability of these equilibrium points and found them unstable.