Diagrammatic routes to nonlocal correlations beyond dynamical mean field theory

Strong electronic correlations pose one of the biggest challenges to solid state theory. We review recently developed methods that address this problem by starting with the local, eminently important correlations of dynamical mean field theory (DMFT). On top of this, non-local correlations on all length scales are generated through Feynman diagrams, with a local two-particle vertex instead of the bare Coulomb interaction as a building block. With these diagrammatic extensions of DMFT long-range charge-, magnetic-, and superconducting fluctuations as well as (quantum) criticality can be addressed in strongly correlated electron systems. We provide an overview of the successes and results achieved---hitherto mainly for model Hamiltonians---and outline future prospects for realistic material calculations.Comment: 60 pages, 42 figures, replaced by the version to be published in Rev. Mod. Phys. 201

Do Our Universities Need Philosophy?

Without any allusion to the times when philosophy was an intellectual dominant of university education, there is no way to consider the present stage of philosophy in universities satisfying. It is supplanted to a distant periphery at a modern university and ends up in a deep shadow of science. As it is demonstrated in the article, such a situation results from misunder standing of the essence and perspective of philosophical knowledge, as well as from the dominant position of science in modern culture. Philosophy is a reflection and a “philosophizing”; as it was determined by M. Heidegger, it is an individual’s and cultural identity. As such, it appears as the main form of subject’s identification and adaptation to the changes taking place in the scientific knowledge and in the world in general

Experimental Observation of Energy Modulation in Electron Beams Passing Through Terahertz Dielectric Wakefield Structures

We report observation of a strong wakefield induced energy modulation in an energy-chirped electron bunch passing through a dielectric-lined waveguide. This modulation can be effectively converted into a spatial modulation forming micro-bunches with a periodicity of 0.5 - 1 picosecond, hence capable of driving coherent THz radiation. The experimental results agree well with theoretical predictions.Comment: v3. Reviewers' suggestions incorporated. Accepted by PR

Conservação de água durante o uso de dispositivos de irrigação de múltiplos suportes nas condições da região de Moscou

The paper focuses on problem of water quality around irrigated soils. It was discovered that flushing of the fertile layer occurs on terrains near protected watersheds because of destroying irrigation procedures. The modernization of irrigation machines has been suggested as a solution for above-mentioned problem. The technological features of circle irrigation machines (IM) in the conditions of complicated soil relief are defined by their supportings including: tow-grip crossing capacity and slipping of carts on the slope. The operating results have been given according to evaluation of IM work in difficult conditions with the picture of their changes in the diagram dependences. The above-mentioned devices are improved to create environmentally friendly and energy-saving solutions in order to enhance the reliability of IM while watering sloping lands In the area of softening of complex soils that refers to the safety and quality of maintenance while the reduction in the amount of water and energy consumption as well as the cost of irrigation system structure, the scientific concepts are searching for tools to providing highly efficient IM work. The main goal of the work is using the obtained results of research in a practical way as to create and modify IM in order to exercise the irrigation tools conveniently and also generally determine the efficiency of machinery while reducing energy and water consumption as well as providing soil cooling technologies using water from irrigation.El documento se centra en el problema de la calidad del agua alrededor de los suelos irrigados. Se descubrió que el enrojecimiento de la capa fértil se produce en terrenos cercanos a cuencas protegidas debido a la destrucción de los procedimientos de riego. La modernización de las máquinas de riego ha sido sugerida como una solución para el problema mencionado anteriormente. Las características tecnológicas de las máquinas de riego en círculo (IM) en las condiciones de alivio de suelo complicado se definen por sus apoyos, que incluyen: capacidad de cruce con agarre de remolque y deslizamiento de carros en la pendiente. Los resultados operativos se han dado de acuerdo con la evaluación del trabajo de IM en condiciones difíciles con la imagen de sus cambios en las dependencias del diagrama. Los dispositivos mencionados anteriormente se han mejorado para crear soluciones respetuosas con el medio ambiente y que ahorran energía para mejorar la confiabilidad de IM mientras se riegan las tierras con pendiente En el área de ablandamiento de suelos complejos que se refiere a la seguridad y la calidad del mantenimiento, mientras que la reducción de la cantidad de consumo de agua y energía, así como el costo de la estructura del sistema de riego, los conceptos científicos están buscando herramientas para proporcionar un trabajo de IM altamente eficiente. El objetivo principal del trabajo es utilizar los resultados obtenidos de la investigación de manera práctica para crear y modificar la IM con el fin de ejercer las herramientas de riego de manera conveniente y también, en general, determinar la eficiencia de la maquinaria al tiempo que reduce el consumo de energía y agua, así como también proporciona suelo Tecnologías de enfriamiento utilizando agua de riego.O artigo enfoca o problema da qualidade da água em torno dos solos irrigados. Descobriu-se que a descarga da camada fértil ocorre em terrenos próximos a bacias protegidas por causa da destruição de procedimentos de irrigação. A modernização de máquinas de irrigação tem sido sugerida como uma solução para o problema acima mencionado. As características tecnológicas das máquinas de irrigação circular (IM) nas condições de relevo complicado do solo são definidas pelos seus apoios, incluindo: capacidade de passagem do cabo de reboque e escorregamento dos carros na encosta. Os resultados operacionais foram fornecidos de acordo com a avaliação do trabalho de IM em condições difíceis, com o quadro de suas mudanças nas dependências do diagrama. Os dispositivos mencionados acima são aprimorados para criar soluções ecologicamente corretas e de baixo consumo de energia, a fim de aumentar a confiabilidade do IM durante a irrigação de terras em declive na área de amolecimento de solos complexos que se referem à segurança e qualidade da manutenção enquanto a redução do quantidade de água e consumo de energia, bem como o custo da estrutura do sistema de irrigação, os conceitos científicos estão à procura de ferramentas para fornecer trabalho altamente eficiente IM. O principal objetivo do trabalho é usar os resultados obtidos da pesquisa de forma prática para criar e modificar IM, a fim de exercitar as ferramentas de irrigação convenientemente e também determinar a eficiência do maquinário, reduzindo o consumo de energia e água, bem como fornecendo o solo. tecnologias de refrigeração usando água da irrigação

Available drugs during of military state: social-economic strategies of functioning reimbursumen’t system

The Russian aggresion against Ukraine became a new reality in the XXI century and definitely shook the whole World. New realities are forcing all spheres of science and practice to work harder and develop, that is why philosophers of law are tended to call war “the driving force of progress”. Our modern life in the condition of war proves, that the technical and scientific progress as it is, is created and developed on thousands and millions of destroyed human lives. But, in order to make a warring society to move successfully forward, save as many innocent lives as possible and meet basic needs of a particularly vulnerable polutation, it is not only army, which is supposed to work for 100%, but also “home front workers” has to try harder. The current war has dimished an understanding of difference between quintiles of population, especially, if we are taking into account differences between beneficiaries of the Affordable Medicines Program (AM). At the beginning of the War, all beneficiaries of the AM, despite of level of their well-being had to suffer equally because of the short-term period of medicines’ shortage due to destroyed infrastructure of cities and regions. They were afraid that those highly necessary medicines would not return to the pharmacies neither in the sphere of the AM, nor even for normal sale. Because of the aforementioned force-majeure, most of people were not even assured that their basic needs will be met, especially were worried those ones, who have been active users of the AM for a long period of time. However, despite of the aforementioned destruction of the insfrastrucutre, the commons fears and dangers of war, the AM has not stopped working. On the contrary, it has become even more successful and progressive. The need to react quickly to the circumstances that took place, forced to achieve long-term plans of the AM creators in a very short time. Thus, the pilot program has finally fit into the general outline of the life support and health care system of Ukraine and became perhaps the most progressive in the whole Europe. But, nevertheless, the progress is definitely not standing still, the situation remains critical, the humanitarian catastrophe is becoming more and more real today, and, thus, the AM opens new promising ways of development for the coming month and years. In fact, our study was devoted to the analysis of the changes that took place since February 24, 2022, as well as promising directions for the development of AM, which are mostly dictated by the newly created humaniatrian crises in the current article.Новою реалією ХХІ століття стала загарбницька війна Росії проти України, яка без сумніву сколихнула цілий світ. Нові реалії життя змушують всі сфери науки і практики працювати у посиленому режимі та розвиватись, саме тому філософи права називають війну “рушійною силою прогресу”. Сучасне життя доводить, що технічний і науковий прогрес, як виявилось, створюється і розвивається на тисячах і мільйонах зруйнованих людських життів. Але, задля того, щоб суспільство країни, що воює, змогло рухатись далі, змогло врятувати якумога більше безвинних життів та забезпечувати базові потреби особливо вразливого контингенту населення, не тільки армія, але й “герої тилу”, тобто медики і вся система охорони здоров’я мають працювати на 100%, як це власне і відбувається зараз. Війна знизила важливість понять “квінтилі населення”, особливо якщо йдеться про прямих бенефіціарів програми “Доступні ліки”, адже серед них всі, незалежно від особистого та фінансового благополуччя, були піддані необхідності страждати від першострокової нестачі ліків, які забезпечувались програмою; були підвергнуті страху, що ці ліки не повернуться не тільки в рамках програми Доступні ліки (ДЛ), але і в принципі будуть недоступні через знищену інфраструктуру багатьох міст, а отже здійснився такий force majeure, при якому жодна людина не могла бути впевнена у власному забезпеченні навіть базових потреб, і особливо ті, хто протягом тривалого часу вже був активним користувачем ДЛ. Тим не менш, не дивлячись на вищезгадану зруйновану інфраструктуру, загальні страх і небезпеку, які приносить із собою війна, програма ДЛ не припинила свою роботу, навпаки, стала навіть більш прогресивною і успішною. Необхідність стрімко реагувати на обставини, які мали місце з погляду на війну, змусили досягнути довготривалі плани творців ДЛ за дуже короткий термін. Таким чином, пілотна програма остаточно вписалась в загальну канву системи життєзабезпечення та охорони здоров’я України і стали чи не найбільш прогресивною в цілій Європі. Але, тим не менш, прогрес безумовно не стоїть на місці, ситуація залишається критичною, гуманітарна катастрофа стає все більш реальною на сьогоднішній день, а отже ДЛ відкриває нові перспективні шляхи розвитку на найближчі місяці і роки. Власне аналізові змін, які мали місце, починаючи від 24-го лютого 2022 року, а також перспективним напрямкам розвитку ДЛ, які здебільшого продиктовані новоствореними гуманітраними кризами населення нашої країни, які мали місце через війну, і було присвячено наше дослідження, результати якого будуть освітлені у нинішній статті

Search for the pentaquark resonance signature in lattice QCD

Claims concerning the possible discovery of the \Theta^+ pentaquark, with minimal quark content uudd\bar{s}, have motivated our comprehensive study into possible pentaquark states using lattice QCD. We review various pentaquark interpolating fields in the literature and create a new candidate ideal for lattice QCD simulations. Using these interpolating fields we attempt to isolate a signal for a five-quark resonance. Calculations are performed using improved actions on a large 20^3 x 40 lattice in the quenched approximation. The standard lattice resonance signal of increasing attraction between baryon constituents for increasing quark mass is not observed for spin-1/2 pentaquark states. We conclude that evidence supporting the existence of a spin-1/2 pentaquark resonance does not exist in quenched QCD.Comment: 42 pages, 28 figures, 11 table

Positive parity pentaquark towers in large Nc QCD

We construct the complete set of positive parity pentaquarks, which correspond in the quark model to {\bar s} q^{Nc+1} states with one unit of orbital angular momentum L=1. In the large Nc limit they fall into the K=1/2 and K=3/2 irreps (towers) of the contracted SU(4)c symmetry. We derive predictions for the mass spectrum and the axial couplings of these states at leading order in 1/Nc. The strong decay width of the lowest-lying positive parity exotic state is of order O(1/Nc), such that this state is narrow in the large Nc limit. Replacing the antiquark with a heavy antiquark {\bar Q} q^{Nc+1}, the two towers become degenerate, split only by O(1/mQ) hyperfine interactions. We obtain predictions for the strong decay widths of heavy pentaquarks to ordinary baryons and heavy H(*)_{\bar Q} mesons at leading order in 1/Nc and 1/mQ.Comment: 21 pages, 2 figures, 5 table

Optical echo in photonic crystals

The dynamics of photonic wavepacket in the effective oscillator potential is studied. The oscillator potential is constructed on a base of one dimensional photonic crystal with a period of unit cell adiabatically varied in space. The structure has a locally equidistant discrete spectrum. This leads to an echo effect, i.e. the periodical reconstruction of the packet shape. The effect can be observed in a nonlinear response of the system. Numerical estimations for porous-silicon based structures are presented for femtosecond Ti:Sapphire laser pump.Comment: 4 page