scholarly journals International Conference PhysicA.SPb/2021

2021 ◽  
Vol 2103 (1) ◽  
pp. 011001
Keyword(s):  
Particle Physics ◽  
Lebedev Physical Institute ◽  
State University ◽  
Multilayered Structures ◽  
International Conference ◽  
Elementary Particle Physics ◽  
Modern Physics ◽  
Poster Presentations ◽  
Ioffe Institute

The International Conference PhysicA. SPb was held 18-22 October 2021 in Saint Petersburg, Russia. The Conference continues the tradition of St.Petersburg Seminars on Physics and Astronomy originating from mid-90s. Since then PhysicA.SPb maintains both scientific and educational quality of contributions delivered to the audience. This is the main feature of the Conference that makes it possible to combine the whole spectrum of modern Physics and Astronomy within one event. PhysicA. SPb/2021 has brought together over 400 academics from many universities and research institutes across whole Russia as well as from USA, UK, South Africa, Poland, Ukraine, Kazakhstan, Belarus, Azerbaijan, and Australia. Oral and poster presentations were combined into well-defined sections among which one should name Astronomy and Astrophysics, Optics and spectroscopy, Physics of ferroics, Nanostructured and thin-film materials, Mathematical physics and numerical methods, Devices and materials for the THz and microwave ranges, Biophysics, Optoelectronic devices, Surface phenomena, Physics and technology of energy conversion, Plasma physics, hydrodynamics and aerodynamics, Nuclear and elementary particle physics, Impurities and defects in solids, Multilayered structures, Spectroscopy of atoms and molecules and Physics of quantum structures. This issue of the Journal of Physics: Conference Series presents the extended contributions from participants of PhysicA.SPb/2021 that were peer-reviewed by expert referees through processes administered by the Presiders of the Organising and Program Committees to the best professional and scientific standards. This was made possible by the efforts of the Sectional and Technical Editors of this Issue: Prof. Petr Arseev (Lebedev Physical Institute), Prof. Alexander Ivanchik (Ioffe Institute), Prof. Polina Ryabochkina (Ogarev Mordova State University), Prof. Yuri Kusraev (Ioffe Institute), Dr. Sergey Nekrasov (Ioffe Institute), Dr. Nikolay Bert (Ioffe Institute), Dr. Nikita Gordeev (Ioffe Institute), Dr. Alexey Popov (Ioffe Institute), Dr. Prokhor Alekseev (Ioffe Institute), Dr. Mikhail Dunaevskii (Ioffe Institute), Prof. Mikhail Nestoklon (Ioffe Institute), Dr. Andrey Dunaev (Orel State University), Prof. Anton Vershovskii (Ioffe Institute), Dr. Vadim Evtikhiev (Ioffe Institute), Prof. Alexey Ustinov (St.Petersburg Electrotechnical University “LETI”), Dr. Alexandra Kalashnikova (Ioffe Institute), Prof. Ivan Mitropolsky (NRC Kurchatov Institute - PNPI), Dr. Evgenia Cherotchenko (Ioffe Institute) and Prof. Dmitry Khokhlov (Moscow State University). The Editors: Nikita S. Averkiev, Sergey A. Poniaev and Grigorii S. Sokolovskii

scholarly journals Dynamical Symmetries of the H Atom, One of the Most Important Tools of Modern Physics: SO(4) to SO(4,2), Background, Theory, and Use in Calculating Radiative Shifts

Symmetry ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1323 ◽  
Author(s):  
G. Jordan Maclay
Keyword(s):  
Hydrogen Atom ◽  
Quantum Electrodynamics ◽  
Particle Physics ◽  
Bound States ◽  
Integrated Treatment ◽  
Invariance Group ◽  
Elementary Particle Physics ◽  
Background Theory ◽  
Modern Physics ◽  
History Of

Understanding the hydrogen atom has been at the heart of modern physics. Exploring the symmetry of the most fundamental two body system has led to advances in atomic physics, quantum mechanics, quantum electrodynamics, and elementary particle physics. In this pedagogic review, we present an integrated treatment of the symmetries of the Schrodinger hydrogen atom, including the classical atom, the SO(4) degeneracy group, the non-invariance group or spectrum generating group SO(4,1), and the expanded group SO(4,2). After giving a brief history of these discoveries, most of which took place from 1935–1975, we focus on the physics of the hydrogen atom, providing a background discussion of the symmetries, providing explicit expressions for all of the manifestly Hermitian generators in terms of position and momenta operators in a Cartesian space, explaining the action of the generators on the basis states, and giving a unified treatment of the bound and continuum states in terms of eigenfunctions that have the same quantum numbers as the ordinary bound states. We present some new results from SO(4,2) group theory that are useful in a practical application, the computation of the first order Lamb shift in the hydrogen atom. By using SO(4,2) methods, we are able to obtain a generating function for the radiative shift for all levels. Students, non-experts, and the new generation of scientists may find the clearer, integrated presentation of the symmetries of the hydrogen atom helpful and illuminating. Experts will find new perspectives, even some surprises.

scholarly journals THE INTERNATIONAL CONFERENCE ON THE SIGNS AND IMAGES IN THE STONE AGE ART: ROOTS AND OUTCOMES

2020 ◽  
Author(s):  
Е.С. Леванова ◽  
Г.А. Хлопачев ◽  
К.Н. Гаврилов
Keyword(s):  
Stone Age ◽  
State University ◽  
Multidisciplinary Research ◽  
International Conference ◽  
The Third ◽  
Peter The Great ◽  
Research Institutes ◽  
The Uk ◽  
Poster Presentations ◽  
Portable Art

27–29 ноября 2019 г. в Институте археологии РАН состоялась Международная конференция «Знаки и образы в искусстве каменного века», организованная Центром палеоискусства и отделом каменного века ИА РАН, Музеем антропологии и этнографии им. Петра Великого (Кунсткамера) РАН, Международной ассоциированной лабораторией «Мультидисциплинарные исследования первобытного искусства Евразии» (ARTEMIR) и Новосибирским государственным университетом. Это третье мероприятие в ряду конференций, связанных с темой изучения монументального и мобильного искусства каменного века. В работе конференции приняли участие специалисты из ряда научных учреждений России, Франции, Великобритании, Германии, Румынии, Швейцарии, Португалии, Норвегии, Италии, Казахстана, было заслушано 45 устных докладов и представлено 8 стендовых докладов. Работа конференции была организована по пяти направлениям, охватывающим проблемы археологического контекста в изучении искусства малых форм и наскальных изображений; изучения знаков и геометрических изображений, техники и стилистики исполнения пещерного и наскального искусства; дискуссий о семантике знаков и образов в искусстве каменного века, а также методологии изучения изображений. On November 27–29, 2019, the Institute of Archaeology (RAS) held the international conference on the Signs and Images in Stone Age Art organized by the Center of Palaeoart and the Stone Age Department of the Institute of Archaeology (RAS), the Peter the Great Museum of Anthropology and Ethnography (Kunstkamera) (RAS), the International Associated Laboratory ‘Multidisciplinary Research of Prehistory Art of Eurasia’ (ARTEMIR) and Novosibirsk State University. It was the third event of this kind in a series of conferences held to discuss research of Stone Age monumental and portable art. The conference was attended by scholars from a number of research institutes of Russia, France, the UK, Germany, Rumania, Switzerland, Portugal, Norway, Italy, and Kazakhstanwho made 45 presentations and organized 8 poster presentations. The conference focused on five areas covering the issues of the archaeological context in studying portable items and rock images as well as signs and geometric images, technology and stylistical features of cave and rock art; discussions of semantics of signs and images in Stone Age art and methodology for examining images.

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