October 27th, 2014

лошадь, диаграмма, Фейнман

Лекции "Квантовая хромодинамика и статистическая физика"

Lecture notes on "Quantum chromodynamics and statistical physics": http://arxiv.org/abs/1410.6478

The concepts and methods used for the study of disordered systems have proven useful in the analysis of the evolution equations of quantum chromodynamics in the high-energy regime: Indeed, parton branching in the semi-classical approximation relevant at high energies is a peculiar branching-diffusion process, and parton branching supplemented by saturation effects (such as gluon recombination) is a reaction-diffusion process. In these lectures, we first introduce the basic concepts in the context of simple toy models, we study the properties of the latter, and show how the results obtained for the simple models may be taken over to quantum chromodynamics.
лошадь, диаграмма, Фейнман

Рождение пары в поле атома, сопровождаемое тормозным излучением

High-energy e+e− photoproduction in the field of a heavy atom accompanied by bremsstrahlung: http://arxiv.org/abs/1410.6566

Helicity amplitudes and differential cross section of high-energy e+e− photoproduction accompanied by bremsstrahlung in
the electric field of a heavy atom are derived. The results are exact in the nuclear charge number and obtained in the leading quasiclassical approximation. They correspond to the leading high-energy small-angle asymptotics of the amplitude. It is shown that, in general, the Coulomb corrections essentially modify the differential cross section as compared to the Born result. When the initial photon is circularly polarized the Coulomb corrections lead to the asymmetry in the distribution over the azimuth angles φi of produced particles with respect to the replacement φi→−φi.

Ну вот, тянул-тянул любимый шеф с публикацией, и дотянулся до того, что люди сделали что-то близкое:((((
лошадь, диаграмма, Фейнман

Хуан Малдасена обо всем сразу

The symmetry and simplicity of the laws of physics and the Higgs boson: http://arxiv.org/abs/1410.6753

We describe the theoretical ideas, developed between the 1950s-1970s, which led to the prediction of the Higgs boson, the particle that was discovered in 2012. The forces of nature are based on symmetry principles. We explain the nature of these symmetries through an economic analogy. We also discuss the Higgs mechanism, which is necessary to avoid some of the naive consequences of these symmetries, and to explain various features of elementary particles.

23+8 pages. 18 figures

У нас принято все концепции объяснять "на яблоках", а он обясняет на обменах между долларами, евро и песо:)))