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Relevant bibliographies by topics / Space of lorentzian metrics

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Academic literature on the topic 'Space of lorentzian metrics'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

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Journal articles on the topic "Space of lorentzian metrics"

1

Mounoud, Pierre. "Dynamical properties of the space of Lorentzian metrics." Commentarii Mathematici Helvetici 78, no. 3 (2003): 463–85. http://dx.doi.org/10.1007/s00014-003-0767-8.

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KAMIMURA, KIYOSHI, SHINOBU MAKITA, and TAKESHI FUKUYAMA. "METRIC FROM NONMETRIC ACTION OF GRAVITY." International Journal of Modern Physics D 01, no. 02 (1992): 363–70. http://dx.doi.org/10.1142/s0218271892000185.

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The action of general relativity proposed by Capovilla, Jacobson and Dell is written in terms of SO(3) gauge fields and gives Ashtekar's constraints for Einstein gravity. However, it does not depend on the spacetime metric nor its signature explicitly. We discuss how the spacetime metric is introduced from algebraic relations of the constraints and the form of the Hamiltonian by focusing our attention on the signature factor. The system describes both Euclidean and Lorentzian metrics depending on reality assignments of the gauge connections. That is, Euclidean metrics arise from the real gauge

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Yildirim, Abdullah. "Slant Curve in Lorentzian BCV Spaces." Journal of Geometry and Symmetry in Physics 56 (2020): 67–85. http://dx.doi.org/10.7546/jgsp-56-2020-67-85.

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The aim of this study is to examine the slant curves in Lorentzian manifolds with BCV (Bianchi-Cartan-Vranceanu) metrics. A practical form of the directional derivative in the presence of the BCV metrics is presented. Moreover, some theorems for slant curves in Lorentzian BCV manifolds are proved.

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Kontsevich, Maxim, and Graeme Segal. "Wick Rotation and the Positivity of Energy in Quantum Field Theory." Quarterly Journal of Mathematics 72, no. 1-2 (2021): 673–99. http://dx.doi.org/10.1093/qmath/haab027.

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Abstract We propose a new axiom system for unitary quantum field theories on curved space-time backgrounds, by postulating that the partition function and the correlators extend analytically to a certain domain of complex-valued metrics. Ordinary Riemannian metrics are contained in the allowable domain, while Lorentzian metrics lie on its boundary.

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Hussain, Ibrar, Tahirullah, and Suhail Khan. "Four-dimensional Lorentzian plane symmetric static Ricci solitons." International Journal of Modern Physics D 28, no. 16 (2019): 2040010. http://dx.doi.org/10.1142/s0218271820400106.

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Our focus is to investigate the Ricci solitons of the plane symmetric and static four-dimensional Lorentzian metrics. It is found that these metrics admit shrinking and concircular potential Ricci soliton vector fields with either 6- or 10-dimensional Lie algebra. Further, it is observed that the 4-dimensional Lorentzian static Ricci soliton manifolds are Einsteinian and hence the Ricci solitons are the trivial Ricci solitons.

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Beem, John K., and Paul E. Ehrlich. "Geodesic completeness and stability." Mathematical Proceedings of the Cambridge Philosophical Society 102, no. 2 (1987): 319–28. http://dx.doi.org/10.1017/s0305004100067347.

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A (connected) Riemannian manifold M is geodesically complete (i.e. each geodesic may be extended to a geodesic with domain ( −∞, + ∞)) iff, as a metric space under the induced Riemannian distance function, M is Cauchy complete ([12], p. 138). Furthermore, all compact Riemannian manifolds are complete. On the other hand, compact pseudo-Riemannian manifolds exist which are not geodesically complete. For example Fierz and Jost[8] have constructed incomplete metrics of the form 2dx dy + h dy2 on T2. Furthermore, Williams [16] has shown that geodesic completeness may fail to be stable for pseudo-Ri

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Noldus, Johan. "A new topology on the space of Lorentzian metrics on a fixed manifold." Classical and Quantum Gravity 19, no. 23 (2002): 6075–107. http://dx.doi.org/10.1088/0264-9381/19/23/313.

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GHANEH, T., F. DARABI, and H. MOTAVALLI. "SIGNATURE CHANGE BY GUP." International Journal of Modern Physics D 22, no. 05 (2013): 1350026. http://dx.doi.org/10.1142/s0218271813500260.

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We revisit the issue of continuous signature transition from Euclidean to Lorentzian metrics in a cosmological model described by Friedmann–Robertson–Walker (FRW) metric minimally coupled with a self-interacting massive scalar field. Then, using a noncommutative (NC) phase space of dynamical variables deformed by generalized uncertainty principle (GUP), we show that the signature transition occurs even for a model described by the FRW metric minimally coupled with a free massless scalar field accompanied by a cosmological constant. This indicates that the continuous signature transition might

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GALLO, EMANUEL, MAGDALENA MARCIANO-MELCHOR, and GILBERTO SILVA-ORTIGOZA. "n-DIMENSIONAL GEOMETRIES AND EINSTEIN EQUATIONS FROM SYSTEMS OF PDE'S." International Journal of Modern Physics D 16, no. 11 (2007): 1725–34. http://dx.doi.org/10.1142/s021827180701119x.

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The aim of this work is twofold: first, we show how all the n-dimensional Riemannian and Lorentzian metrics can be constructed from a certain class of systems of second-order PDE's which are in duality to the Hamilton–Jacobi equation; second, we impose the Einstein equations on these PDE's.

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Brunetti, Letizia, and Maria Pastore. "On the classification of Lorentzian Sasaki space forms." Publications de l'Institut Math?matique (Belgrade) 94, no. 108 (2013): 163–68. http://dx.doi.org/10.2298/pim1308163b.

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Sasaki manifolds admit a nowhere vanishing vector field and it is always possible to consider a Lorentz metric on them. Then we are able to obtain a classification result for compact Lorentz-Sasaki space forms.

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Dissertations / Theses on the topic "Space of lorentzian metrics"

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Mehidi, Lilia. "Points conjugués des tores lorentziens." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0295.

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Dans la première partie de cette thèse, nous donnons une description des surfaces lorentziennes simplement connexes et maximales dont le groupe d’isométries est de dimension 1 (c’est-à-dire possédant un champ de Killing complet), à l’aide d’une variété riemannienne de dimension 1 (généralement non séparée) et d’une fonction lisse définie dessus ; nous étudions ensuite la complétude géodésique de telles surfaces. Dans la deuxième partie qui est la partie principale de cette thèse, nous donnons une infinité de nouveaux exemples de surfaces lorentziennes compactes sans points conjugués. De plus,

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Leitner, Felipe. "The twistor equation in Lorentzian spin geometry." Doctoral thesis, [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=965107566.

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Forman, Rachel Emily. "Objective performance metrics for improved space telerobotics training." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68408.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 47-50).<br>NASA astronauts undergo many hours of formal training and self-study to gain proficiency in space teleoperation tasks. After each lesson, instructors score an astronaut's performance in several broad skill categories, including 'General Situational Awareness', 'Maneuvers/Task Performance', and 'Hand- Controller Techniques'. A plus, check, or minus indicates that the student is ahead of, at, or behind th

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Rubinstein, Yanir Akiva. "Geometric quantization and dynamical constructions on the space of Kähler metrics." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/44270.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 2008.<br>Includes bibliographical references (p. 185-200).<br>This Thesis is concerned with the study of the geometry and structure of the space of Kihler metrics representing a fixed cohomology class on a compact Kähler manifold. The first part of the Thesis is concerned with a problem of geometric quantization: Can the geometry of the infinite-dimensional space of Kähler metrics be approximated in terms of the geometry of the finite-dimensional spaces of FubiniStudy Bergman metrics sitting inside it? We restrict to

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Loft, Brian M. "Connected components of the space of positive scalar curvature metrics on spheres /." view abstract or download file of text, 2005. http://wwwlib.umi.com/cr/uoregon/fullcit?p3164082.

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Thesis (Ph. D.)--University of Oregon, 2005.<br>Typescript. Includes vita and abstract. Includes bibliographical references (leaves 88-90). Also available for download via the World Wide Web; free to University of Oregon users.

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Miah, Abdul. "Product-based environmental metrics for use within aerospace, defence, space and security industries (ADS)." Thesis, University of Surrey, 2018. http://epubs.surrey.ac.uk/845983/.

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Within the aerospace, defence, space, and security (ADS) industries, there is a growing reporting requirement and interest in understanding and reducing the environmental impacts of products and related risks to business. This dissertation presents the research carried out in collaboration with six ADS companies (ADS Group, Airbus Group, BAE Systems, Bombardier Aerospace, Granta Design, and Rolls-Royce) to establish industry methods for consistently measuring and reporting two pre-selected product-based environmental indicators identified as important to the industry: energy consumption and ac

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Andersson, Jonas. "Silhouette-based Level of Detail : A comparison of real-time performance and image space metrics." Thesis, Blekinge Tekniska Högskola, Institutionen för datalogi och datorsystemteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-12755.

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Context. The geometric complexity of objects in games and other real-time applications is a crucial aspect concerning the performance of the application. Such applications usually redraw the screen between 30-60 times per second, sometimes even more often, which can be a hard task in an environment with a high number of geometrically complex objects. The concept called Level of Detail, often abbreviated LoD, aims to alleviate the load on the hardware by introducing methods and techniques to minimize the amount of geometry while still maintaining the same, or very similar result. Objectives. Th

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León, Guzmán María Amelia. "Clasificación de toros llanos lorentzianos en espacios tridimensionales." Doctoral thesis, Universidad de Murcia, 2012. http://hdl.handle.net/10803/83824.

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Un problema clásico en geometría lorentziana es la descripción de las inmersiones isométricas entre los espacios lorentzianos de curvatura constante. En este trabajo nos centramos en la clasificación de las inmersiones isométricas del plano lorentziano en el espacio anti-de Sitter tridimensional. Damos una fórmula de representación de estas inmersiones en términos de pares de curvas (con posibles singularidades) en el plano hiperbólico. Esto nos permite resolver los problemas propuestos por Dajczer y Nomizu en 1981. De entre todas las inmersiones isométricas del plano lorentziano en el espaci

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Labeni, Hicham. "Réalisation de métrique CAT(k) sur les surfaces dans les variétés lorentziennes de courbure constante." Thesis, CY Cergy Paris Université, 2020. http://www.theses.fr/2020CYUN1007.

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On prouve que toute métrique de courbure leq k (au sens de A. D. Alexandrov) sur une surface fermée est isométrique à une métrique induite sur une surface convexe dans un espace lorentzien de dimension 3 et de courbure sectionnelle constante k<br>We prove that any metric with curvature leq k (in the sense of A. D. Alexandrov) on a closed surface is isometric to the induced intrinsic metric on a space-like convex surface in a Lorentzian manifold of dimension 3 with sectional curvature k

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Miloš, Radovanović. "High-Dimensional Data Representations and Metrics for Machine Learning and Data Mining." Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2011. https://www.cris.uns.ac.rs/record.jsf?recordId=77530&source=NDLTD&language=en.

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In the current information age, massive amounts of data are gathered, at a rate prohibiting their effective structuring, analysis, and conversion into useful knowledge. This information overload is manifested both in large numbers of data objects recorded in data sets, and large numbers of attributes, also known as high dimensionality. This dis-sertation deals with problems originating from high dimensionality of data representation, referred to as the “curse of dimensionality,” in the context of machine learning, data mining, and information retrieval. The described research follo

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Books on the topic "Space of lorentzian metrics"

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Fox, Bernard. Guidelines and metrics for assessing space system cost estimates. RAND Project Air Force, 2008.

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Fox, Bernard. Guidelines and metrics for assessing space system cost estimates. RAND Project Air Force, 2008.

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Metrics on the phase space and non-selfadjoint pseudo-differential operators. Birkhäuser, 2010.

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Lerner, Nicolas. Metrics on the Phase Space and Non-Selfadjoint Pseudo-Differential Operators. Birkhäuser Basel, 2010. http://dx.doi.org/10.1007/978-3-7643-8510-1.

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Complex Monge-Ampère equations and geodesics in the space of Kähler metrics. Springer Verlag, 2012.

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Guedj, Vincent, ed. Complex Monge–Ampère Equations and Geodesics in the Space of Kähler Metrics. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-23669-3.

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Ibragimov, Zair. Topics in several complex variables: First USA-Uzbekistan Conference on Analysis and Mathematical Physics, May 20-23, 2014, California State University, Fullerton, California. American Mathematical Society, 2016.

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Guidelines and Metrics for Assessing Space System Cost Estimates. RAND Corporation, 2007.

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Guedj, Vincent. Complex Monge-Ampère Equations and Geodesics in the Space of Kähler Metrics. Springer, 2012.

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Snyder, Don, Patrick Mills, Katherine Comanor, and Charles Roll. Sustaining Air Force Space Systems: New Metrics Show How Investments Affect Operational Performance. RAND Corporation, 2007. http://dx.doi.org/10.7249/rb228.

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Book chapters on the topic "Space of lorentzian metrics"

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Fujimori, Shoichi, Yu Kawakami, Masatoshi Kokubu, Wayne Rossman, Masaaki Umehara, and Kotaro Yamada. "Hyperbolic Metrics on Riemann Surfaces and Space-Like CMC-1 Surfaces in de Sitter 3-Space." In Recent Trends in Lorentzian Geometry. Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-4897-6_1.

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Al-Ameen, Talal, and Imad Muhi. "Time Dilation in Lorentzian and Modified Euclidean Metrics of Space–time." In Advances in Intelligent Systems and Computing. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-1696-9_32.

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Javaloyes, Miguel Angel. "Conformally Standard Stationary SpaceTimes and Fermat Metrics." In Recent Trends in Lorentzian Geometry. Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-4897-6_9.

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Lam, Wai Yeung, and Masashi Yasumoto. "Trivalent Maximal Surfaces in Minkowski Space." In Lorentzian Geometry and Related Topics. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-66290-9_10.

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Alexander, Stephanie B., and William A. Karr. "Space-Time Convex Functions and Sectional Curvature." In Lorentzian Geometry and Related Topics. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-66290-9_2.

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López, Rafael. "Constant Mean Curvature Hypersurfaces in the Steady State Space: A Survey." In Lorentzian Geometry and Related Topics. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-66290-9_11.

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Mukhopadhyay, Jayanta. "Geometry, Space, and Metrics." In Approximation of Euclidean Metric by Digital Distances. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-9901-9_1.

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Umehara, Masaaki, and Kotaro Yamada. "Surfaces With Light-Like Points In Lorentz-Minkowski 3-Space With Applications." In Lorentzian Geometry and Related Topics. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-66290-9_14.

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Baum, Helga, and Thomas Leistner. "Lorentzian Geometry: Holonomy, Spinors, and Cauchy Problems." In Geometric Flows and the Geometry of Space-time. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-01126-0_1.

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Alarcón, Eva M., Alma L. Albujer, and Magdalena Caballero. "Spacelike Hypersurfaces in the Lorentz-Minkowski Space with the Same Riemannian and Lorentzian Mean Curvature." In Lorentzian Geometry and Related Topics. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-66290-9_1.

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Conference papers on the topic "Space of lorentzian metrics"

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Eckstein, Eugene C., Vinay Bhal, JoDe M. Lavine, Baoshun Ma, Mark Leggas, and Jerome A. Goldstein. "Nested First-Passages of Tracer Particles in Flows of Blood and Control Suspensions: Symmetry and Lorentzian Transformations." In ASME 2017 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/fedsm2017-69549.

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Theory of molecular Taylor-Aris dispersion (TAD) is an accepted framework describing tracer dispersion in suspension flows and determining effective diffusion coefficients. Our group reported a pseudo-Lagrangian method to study dispersion in suspension flows at FEDSM-2000. Tracer motions were studied in a steadily moving inertial reference frame (SMIRF) aligned with the flow direction; increments of change of axial position of individual tracers were collected to demonstrate how the tracer moved as they, individually, interacted with similar collections of other bodies brought to and from the

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Kerimbekov, Yerzhan, Hasan Sakir Bilge, and Hasan Huseyin Ugurlu. "Classification with SVM in Lorentzian space." In 2017 25th Signal Processing and Communications Applications Conference (SIU). IEEE, 2017. http://dx.doi.org/10.1109/siu.2017.7960345.

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Kerimbekov, Yerzhan, and Hasan Şakir Bilge. "Improved Feature Selection in Lorentzian Space." In ICMLC 2017: 2017 the 9th International Conference on Machine Learning and Computing. ACM, 2017. http://dx.doi.org/10.1145/3055635.3056582.

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Turhan, Ceren Guzel, and Hasan Sakir Bilge. "kNN algorithm based on axis characteristic on Lorentzian space." In 2014 22nd Signal Processing and Communications Applications Conference (SIU). IEEE, 2014. http://dx.doi.org/10.1109/siu.2014.6830683.

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Jeon, Hong J., and Anca D. Dragan. "Configuration Space Metrics." In 2018 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS). IEEE, 2018. http://dx.doi.org/10.1109/iros.2018.8593564.

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Ziad, Muhammad. "Classification of cylindrically symmetric static Lorentzian manifolds according to their Petrov types and metrics." In Proceedings of the MG14 Meeting on General Relativity. WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813226609_0310.

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Enguehard, S., and Brian Hatfield. "Diffractive metrics for segmented mirrors." In Space Optics '94, edited by Thierry M. Dewandre, Joachim J. Schulte-in-den-Baeumen, and Emmanuel Sein. SPIE, 1994. http://dx.doi.org/10.1117/12.188137.

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Grochowski, Marek. "Reachable sets for a class of contact sub-lorentzian metrics on R3, and null non-smooth geodesics." In Geometry and topology of caustics. Institute of Mathematics Polish Academy of Sciences, 2008. http://dx.doi.org/10.4064/bc82-0-7.

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Sollitt, Luke, and Greg Davidson. "NASA's Science Report Card: The Science News Metrics." In Space 2006. American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-7309.

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Tandra, Rahul, Anant Sahai, and Venugopal V. Veeravalli. "Space-Time Metrics for Spectrum Sensing." In 2010 IEEE International Symposium on New Frontiers in Dynamic Spectrum Access Networks (IEEE DySPAN). IEEE, 2010. http://dx.doi.org/10.1109/dyspan.2010.5457882.

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Reports on the topic "Space of lorentzian metrics"

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Kalkan, Ozgür Boyacıoğlu, and Hakan Oztürk. On Rectifying Curves in Lorentzian n-Space. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, 2019. http://dx.doi.org/10.7546/crabs.2019.02.03.

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Kalkan, Özgür Boyacıoğlu. A New Approach on Rectifying Curves in Lorentzian n-Space. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, 2020. http://dx.doi.org/10.7546/crabs.2020.06.04.

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Matthews, Stephen N., Louis Iverson, Matthew Peters, and Anantha Prasad. Assessing potential climate change pressures across the conterminous United States. United States Department of Agriculture Forest Service, 2018. http://dx.doi.org/10.32747/2018.6941248.ch.

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The maps and tables presented here represent potential variability of projected climate change across the conterminous United States during three 30-year periods in this century and emphasizes the importance of evaluating multiple signals of change across large spatial domains. Maps of growing degree days, plant hardiness zones, heat zones, and cumulative drought severity depict the potential for markedly shifting conditions and highlight regions where changes may be multifaceted across these metrics. In addition to the maps, the potential change in these climate variables are summarized in ta

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Downing, W. Logan, Howell Li, William T. Morgan, Cassandra McKee, and Darcy M. Bullock. Using Probe Data Analytics for Assessing Freeway Speed Reductions during Rain Events. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317350.

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Rain impacts roadways such as wet pavement, standing water, decreased visibility, and wind gusts and can lead to hazardous driving conditions. This study investigates the use of high fidelity Doppler data at 1 km spatial and 2-minute temporal resolution in combination with commercial probe speed data on freeways. Segment-based space-mean speeds were used and drops in speeds during rainfall events of 5.5 mm/hour or greater over a one-month period on a section of four to six-lane interstate were assessed. Speed reductions were evaluated as a time series over a 1-hour window with the rain data. T

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