## May 13th, 2021

### Симпатичная задачка

A Curious Use of Extra Dimension in Classical Mechanics: https://arxiv.org/abs/2105.05399
Trung Phan, Anh Doan
Extra dimensions can be utilized to simplifies problems in classical mechanics, offering new insights. Here we show a simple example of how the motion of a test particle under the influence of an 1D inverse-quadratic potential is equivalent to that of another test particle moving freely in 2D Euclidean space and 3D Minkowskian space.

### А вот это чем-то похоже на то, что делал я

Надо будет разобраться...

Time-dependent forces between a swift electron and a small nanoparticle within the dipole approximation: https://arxiv.org/abs/2105.05367
J. Castrejón-Figueroa, J. Á. Castellanos-Reyes, C. Maciel-Escudero, A. Reyes-Coronado, R. G. Barrera
In this paper we calculate the time-dependent forces between a swift electron traveling at constant velocity and a metallic nanoparticle made of either aluminum or gold. We consider that the nanoparticle responds as an electric point dipole and we use classical electrodynamics to calculate the force on both the nanoparticle and the electron. The values for the velocity of the electron and the radius of the nanoparticle were chosen in accordance with electron microscopy observations, and the impact parameter was selected to fulfill the constraints imposed by the dipole approximation. We found that there are times when the force on the nanoparticle is attractive and others when it is repulsive, and show that this is due to the delayed electromagnetic response of the nanoparticle. To establish the limits of validity of our approach, we calculate the total linear momentum transfer to the nanoparticle, and compare it with results obtained, in frequency space, using the full multipole expansion of the fields induced on the nanoparticle, considering the effects of electromagnetic radiation.
Subjects: Classical Physics (physics.class-ph)
Journal reference: Phys. Rev. B 103, 155413 (2021)