September 7th, 2020

лошадь, диаграмма, Фейнман

Учить первогодков калибровочным теориям

Проглядев по диагонали, не думаю, что автор нашел что-то новое, но пусть будет.

Teaching gauge theory to first year students:
Nils-Erik Bomark
One of the biggest revelations of 20th century physics, is virtually unheard of outside the inner circles of particle physics. This is the gauge theory, the foundation for how all physical interactions are described and a guiding principle for almost all work on new physics theories. Is it not our duty as physicists to try and spread this knowledge to a wider audience?
Here, two simple gauge theory models are presented that should be understandable without any advanced mathematics or physics and it is demonstrated how they can be used to show how gauge symmetries are used to construct the standard model of particle physics. This is also used to describe the real reason we need the Higgs field.
Though these concepts are complicated and abstract, it seems possible for at least first year students to understand the main ideas. Since they typically are very interested in cutting edge physics, they do appreciate the effort and enjoy the more detail insight into modern particle physics. These results are certainly encouraging more efforts in this direction.
Comments: 18 pages, 1 figure
лошадь, диаграмма, Фейнман

Бразильские упражнения на СТО

The mass-energy relation and the Doppler shift of a relativistic light source:

Ademir Xavier Jr
This work considers the cospectral and arbitrary light emission of a moving source. The observed wavelengths of the emitted photons are described in term of kinematic and dynamical Doppler shifts in which the mass-energy relation plays a fundamental role. The presentation is an alternative way of emphasizing the importance of the concept of proper mass as a conserved quantity and the implications of the mass-energy relation when a source emits radiation. The physical contexts in which the source changes velocity after emission are discussed and a set of additional problems is presented.
Comments: Submitted to Physics Education (February 2020)