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Causal Properties of Lorentzian Manifolds and Regular Coverings
Lobachevskii Journal of Mathematics. 2024. Vol. 45. No. 8. P. 3924–3934.
D. A. Maksimov, Yakovlev E.
Regular coverings of Lorentzian manifolds are studied under the assumption that the covering map is isometric and preserves time orientation. Conditions for the covering manifold are obtained that are necessary and sufficient for the base to be chronological, causal, strongly or stable causal, and also globally hyperbolic manifold. As a corollary, statements are obtained that the indicated causal properties rise from the base to the covering manifold. In the general situation the opposite is not true. The connections between splittings of the base and the covering manifold in the case of their global hyperbolicity are also studied.
Pilé I., Shchur L., Deng Y., Physical Review B: Condensed Matter and Materials Physics 2026 Vol. 114 Article 014101
We investigate the spatial overlap of successive spin configurations in Markov chain Monte Carlo simulations using the local Metropolis algorithm and the Swendsen-Wang and Wolff cluster algorithms. We examine the dynamics of these algorithms for models in different universality classes: Ising model, Potts model with three components, and four-state Potts model. The overlap of two ...
Added: July 6, 2026
Irkutsk: ISDCT SB RAS, 2026.
We study a model problem on the filtration of a conducting fluid through a
porous layer. A porous medium is presented as an assemblage of identical spherical
cells. Each cell consists of a porous core and liquid shell. We derive apriori estimates
for flow characteristics which show the specific behavior of the fluid. Our estimates
are validated numerically. ...
Added: July 5, 2026
М.: Наука и технологии, 2026.
«Телекоммуникации» ежемесячный рецензируемый производственный, информационно-аналитический и учебно-методический журнал выходит в свет с июля 2000 г.
Для руководителей и работников промышленности, научно-исследовательских и проектно-конструкторских институтов, высших учебных заведений, аспирантов и студентов, а также для специалистов, разрабатывающих, выпускающих и эксплуатирующих средства телекоммуникаций.
Новости разработок и производства, прогнозы развития, защита информации, Нормативные, справочные, аналитические и учебно-методические материалы.
Переход к глобальному информационному ...
Added: July 4, 2026
МФТИ, 2025.
абота редакции научного журнала «Труды Московского физико-технического института» (кратко «Труды МФТИ»), редакционной коллегии и редакционного совета осуществляется в соответствии с Положением, утвержденным ректором института. В состав редакционной коллегии входят руководители института, факультетов, институтских и факультетских кафедр. Главный редактор журнала —президент МФТИ, член-корр. РАН Кудрявцев Н.Н.
Журнал «Труды МФТИ» входит в базу данных РИНЦ (Российский Индекс Научного Цитирования) и доступен в электронной ...
Added: July 4, 2026
Springer, 2026.
This book presents established and new research on the close connections between graph games and systems of logic, particularly existing and newly designed modal logics. The volume utilizes two graph games – the sabotage game and the hide-and-seek game – to demonstrate the natural interplay between designing new graph games and exploring new kinds of ...
Added: June 30, 2026
Pochinka O., Barinova M., Journal of Geometry and Physics 2026 Vol. 228 P. 1–8
In the present paper we consider an Ω-stable 3-diffeomorphism with a solid or thickened surfaced non-trivial basic set. Such basic sets include, for instance, all one-dimensional expanding attractors and those two-dimensional basic sets that are not expanding. We prove that the chain recurrent set of every such a diffeomorphism necessarily contains at least two non-trivial ...
Added: June 30, 2026
German O., Illarionov A., Известия РАН. Серия математическая 2026 Т. 90 № 3 С. 3–18
Пусть симплекс с целочисленными вершинами - содержащий ровно одну целочисленную точку, отличную от своих вершин. В работе доказывается, что если точка находится во внутренности симплекса или в относительной внутренности некоторой гиперграни симплекса, то объем симплекса ограничен величиной, зависящей только от размерности, в противном случае объем симплекса может быть сколь угодно большим. Этот результат применяется для вывода асимптотической формулы для среднего числа вершин полиэдров ...
Added: June 29, 2026
Ivchenko A., Nigmatullin R. R., Dorokhin S. V., Mathematics 2021 Vol. 9 No. 4 Article 381
n this paper, we focus on the generalization of the Hurst empirical law and suggest a set of reduced parameters for quantitative description of long-time series. These series are usually considered as a specific response of a complex system (economic, geophysical, electromagnetic and other systems), where successive fixations of external factors become impossible. We consider ...
Added: June 27, 2026
Ivchenko A., Shestoperov A. I., Fomina E. V., Microgravity Science and Technology 2025 Vol. 37 No. 19 P. 1–19
The paper is dedicated to the analysis of medico-biological data obtained during locomotor testing of astronauts. Accurate data interpretation plays a crucial role in locomotion system monitoring, prophylaxis of long-duration spaceflight negative effects and thus in the development of an autonomous medical support system for deep space expeditions. During the locomotor testing the astronaut changes ...
Added: June 26, 2026
Gadzhimirzaev S., Хельвас А. В., 2023 3rd International Conference on Innovative Research in Applied Science, Engineering and Technology (IRASET) Mohammedia, Morocco 2023 P. 1–6
The article proposes the architecture for eventdriven Emergency Operation Center with Machine Vision Component. Sources of information are analyzed and approaches to machine vision events for tactical situations detection and estimation are discussed. Messages from Machine Vision Components are converted to Common Alerting Protocol and processed by Operation Center environment for tactical situations recognition. ...
Added: June 26, 2026
Zaichenko L., Journal for the Theory of Social Behaviour 2026 Vol. 56 No. 1
This paper attempts to revisit the critical realist theory of reflexivity, derived from the pragmatist tradition of symbolic interactionism (SI). It discusses how interactionist sociology, with its emphasis on investigating microstructures through meaning‐making, has formed a critical realist theory of reflexivity that serves as a theoretical bridge between the micro and macro levels—specifically, between ‘subjective ...
Added: February 3, 2026
Grigoryev D., Gallyamova A., Komyaginskaya E., International Journal of Intercultural Relations 2025 Vol. 108 Article 102240
The debate around the integration hypothesis in acculturation research frequently centers on the interpretation of effect sizes. While critics argue that these effects are too small and inconsistent to be meaningful, supporters maintain that they reflect statistically robust and theoretically coherent patterns. This controversy reveals a broader epistemological challenge in psychology: persistent ambiguity regarding what ...
Added: June 27, 2025
В.Э. Терехович, Эпистемология и философия науки 2023 Т. 60 № 1 С. 149–165
The first part of the paper was devoted to the arguments for and against the eliminative version of ontic structural realism (OSR). This part continues the critical analysis of non-eliminative versions of OSR that attempt to find an ontological compromise between structures and objects. Since A. Chakravartty's semirealism concentrates on causal properties and declares its ...
Added: October 27, 2023
Snetkov I., Человек 2023 Т. 34 № 3 С. 93–110
The article explores the intuition of moral responsibility from a naturalistic perspective. The aim of the article was to analyse what possible naturalistic approaches to the concept of moral responsibility are possible from a neurophilosophical point of view. The aim is to revisit the concept of moral responsibility in order to remove the libertarian and ...
Added: September 11, 2023
Yakovlev E., Russian Mathematics, USA 2023 Vol. 67 No. 3 P. 76–84
In this paper, we study coverings of the Serre bundle category. A covering mapping of one such bundle onto another is understood as a morphism of the indicated category that consists of covering mappings of total spaces and bases. Earlier, the author associated each such covering with a subsequence of the homotopy sequence of the ...
Added: September 7, 2023
Kirsberg I. V., Phainomena. Journal of Phenomenology and Hermeneutics 2023 No. 32 P. 203–220
The article rejects the traditional limitation of causality in phenomenology
and attempts to demonstrate the mistakes in Edmund Husserl’s arguments for
such an understanding, which limited natural causality to the empirical world and
confused both natural as well as motivational causality with logical and psychological
connections. The specificity of causality is stressed, in order to clarify the main structures
of ...
Added: July 22, 2023
Терехович В.Э., Эпистемология и философия науки 2022 Т. 59 № 3 С. 166–184
The focus of the paper is a discussion around one of the versions of scientific realism – ontic structural realism (OSR), which has gained popularity due to the development of quantum field theory. According to OSR, individual objects do not exist as ontological primitives. The ontology of objects and their properties is replaced by the ...
Added: October 30, 2022
Е. И. Яковлев, В кн.: Труды Математического центра имени Н.И. Лобачевского. Том 62.: КФУ, 2022. С. 125–127.
Исследуются накрытия в категории расслоений Серра. Под накрывающим отображением одного расслоения на другое понимается морфизм указанной категории, состоящий из накрывающих отображений тотальных пространств и баз. Построены инварианты таких накрытий и доказана теорема существования накрытия с заданным инвариантом. Показано, что из локальной тривиальности базового расслоения следует аналогичное свойство для накрывающего расслоения. ...
Added: October 24, 2022
Göçer İ., Alatas S., Peker O., Theoretical and Applied Economics 2016 Vol. 23 P. 153–164
The purpose of this study is to examine the effects of research-development expenditures and innovation on income using new generation panel data analysis for 11 EU countries. We found that that if research-development expenditures and innovation goes up by 1%, income, on average, raises by 0.19% and 4.05%, respectively. ...
Added: September 27, 2022
Yakovlev E., Russian Mathematics (USA) 2022 № 3 С. 71–84
The category of coverings of a given Serre bundle is investigated. By a covering mapping
of one such bundle onto another we mean a morphism in the category of bundles consisting of
covering mappings of total spaces and bases. An invariant of a covering from the indicated category
is constructed, which is the conjugacy class of some subsequence ...
Added: August 10, 2022
Grigoryev D., Berry J. W., International Journal of Intercultural Relations 2022 Vol. 86 No. 1 P. 158–162
The invited IAIR Award Paper by Kunst (2021) published in IJIR asserts that there is a “causality crisis” in acculturation research and critically discusses the current meta-analytical evidence supporting the integration hypothesis. In this commentary, we question this claim in light of our understanding of the acculturation process and its constituent phenomena. Our proposal is ...
Added: November 15, 2021
Umar Z., Gubareva M., Teplova T., Resources Policy 2021 No. 73 P. 1–11
We apply wavelet analyses to study how the Covid pandemic influenced the volatility of commodity prices, covering various classes of commodities. We document the intervals of low, medium, and high coherence between the coronavirus panic index and the moves of the commodity prices. The low coherence intervals indicate the diversification potential of commodity investments during a systemic ...
Added: September 22, 2021
Gonchar T., Yakovlev E., Russian Mathematics 2021 Vol. 65 No. 4 P. 22–43
Исследуется категория регулярных накрытий заданного гладкого главного расслоения. Под накрывающим отображением одного главного расслоения на другое понимается морфизм в категории главных расслоений, состоящий из накрывающих отображений структурных групп, тотальных пространств и баз. Основные результаты: построение инварианта регулярного накрытия, представляющего собой подпоследовательность гомотопической последовательности базового расслоения, теорема существования накрытия с заданным инвариантом, критерии морфизмов и изоморфизмов, ...
Added: September 21, 2021
Indregard Jonas Jervell, Kantian Review 2017 Vol. 22 No. 1 P. 27–51
A well-known trilemma faces the interpretation of Kant’s theory of affection, namely whether the objects that affect us are empirical, noumenal or both. I argue that, according to Kant, the things that affect us and cause representations in us are not empirical objects. I articulate what I call the Causal Power Argument, according to which ...
Added: December 2, 2019