April 26th, 2021

лошадь, диаграмма, Фейнман

Обзор по темной материи и ранней вселенной

Dark matter and the early Universe: a review: https://arxiv.org/abs/2104.11488
A. Arbey, F. Mahmoudi
Dark matter represents currently an outstanding problem in both cosmology and particle physics. In this review we discuss the possible explanations for dark matter and the experimental observables which can eventually lead to the discovery of dark matter and its nature, and demonstrate the close interplay between the cosmological properties of the early Universe and the observables used to constrain dark matter models in the context of new physics beyond the Standard Model.

Comments: 72 pages, 35 figures
Journal reference: Progress in Particle and Nuclear Physics (2021) 103865

Улучшай, не улучшай...

Авторы говорят, что записывают спиноры в каком-то самом-пресамом общем виде, и заново пересчитывают ключевые процессы КЭД: рассеяние Баба и рассеяние Комптона. И оказывается, что никаких новых поправок не возникает:))) Как тут не вспомнить бессмертные слова великого и мудрого Александра Ильича Ахиезера, регулярно поризносимые им на лекциях: "Сколько поле ни квантуй - все равно получишь... квантовую электродинамику, Collapse )" :)))

Cross section for Bhabha and Compton scattering beyond quantum field theory: https://arxiv.org/abs/2104.11607
Flora Moulin, Luca Fabbri, Aurélien Barrau
We consider the theory of spinor fields written in polar form, that is the form in which the spinor components are given in terms of a module times a complex unitary phase respecting Lorentz covariance. In this formalism, spinors can be treated in their most general mathematical form, without the need to restrict them to plane waves. As a consequence, calculations of scattering amplitudes can be performed by employing the most general fermion propagator, and not only the free propagator usually employed in QFT. In this article, we use these quantities to perform calculations in two notable processes, the electron-positron and Compton scatterings. We show that although the methodology differs from the one used in QFT, the final results in the two examples turn out to give no correction as predicted by QFT.
Comments: 7 pages
лошадь, диаграмма, Фейнман

Точное решение для магнитного поля соленоида

A note on the exact solution for the magnetic field in a solenoid: https://arxiv.org/abs/2104.11592
G. Dattoli, E. Di Palma, E. Sabia
We comment on a recent paper regarding the derivation of the magnetic field components of a solenoid in analytical form by proposing a different and simpler method
Subjects: Accelerator Physics (physics.acc-ph)