搜索结果: 211-225 共查到“知识库 理学 geometry”相关记录312条 . 查询时间(0.109 秒)
Geometry and observables in (2+1)-gravity
vacuum spacetimes (2+1)-gravity geometrical properties
2010/3/18
We review the geometrical properties of vacuum spacetimes in (2+1)-gravity with vanishing cosmological constant. We explain how these spacetimes are characterised as quotients of their universal cover...
A universe much like the (Euclidean) de Sitter space-time appears as background geometry in the causal dynamical triangulation (CDT) regularization of quantum gravity. We study the geometry of such un...
Maximal extension of the Schwarzschild spacetime inspired by noncommutative geometry
noncommutative geometry Schwarzschild spacetime
2010/3/17
We derive a transformation of the noncommutative geometry inspired Schwarzschild solution
into new coordinates such that the apparent unphysical singularities of the metric are removed.
Moreover, we...
Critical phenomena and information geometry in black hole physics
Critical phenomena black hole physics information geometry
2010/3/17
We discuss the use of information geometry in black hole physics and present the outcomes. The type of information geometry we utilize in this approach is the thermodynamic (Ruppeiner) geometry define...
Spacetime geometry in (2+1)-gravity via measurements with returning lightrays
Spacetime geometry (2+1)-gravity
2010/3/17
We consider an observer in a (2+1)-spacetime without matter and cosmological constant who measures spacetime geometry by emitting lightrays which return to him at a later time. We investigate several ...
Global Lorentzian geometry from lightlike geodesics: What does an observer in (2+1)-gravity see?
lightlike geodesics (2+1)-gravity
2010/3/19
We show how an observer could measure the non-local holonomy variables that parametrise the flat Lorentzian 3d manifolds arising as spacetimes in (2+1)-gravity. We consider an observer who emits light...
Acoustic geometry for general relativistic barotropic irrotational fluid flow
acoustic spacetime relativistic fluid flow barotropic irrotational
2010/3/17
"Acoustic spacetimes", in which techniques of differential geometry are used to investigate sound propagation in moving fluids, have attracted considerable attention over the last few decades. Most o...
Fluctuating Twistor-Beam Solutions and Holographic Pre-Quantum Kerr-Schild Geometry
Fluctuating Twistor-Beam Solutions Holographic Pre-Quantum Kerr-Schild Geometry
2010/3/17
Kerr-Schild (KS) geometry is based on a congruence of twistor null lines which forms a holographic space-time determined by the Kerr theorem. We describe in details integration of the non-stationary D...
Recent Development on the Geometry of the Teichuller and Moduli Spaces of Riemann Surfaces and Polarized Calabi-Yau Manifolds
Geometry of the Teichuller Moduli Spaces Riemann Surfaces Polarized Calabi-Yau Manifolds
2018/4/19
The moduli spaceMg,k of Riemann surfaces of genus g with k punctures plays an important role in many area of mathematics and theoretical physics.In this article we first survey some of our recent work...
Combined space-time manifold and the quantum geometry
Relativity quantum unification particle wave duality
2010/9/13
In a previous article we defined ”combined manifold” M3 as the graph of a diffeomorphism from one manifold M1 to another M2, akin to the idea of a diagonal map. In this paper, we derive the values for...
Acoustic excitation of superharmonic capillary waves on a meniscus in a planar micro-geometry
Acoustic excitation superharmonic capillary waves micro-geometry
2010/4/6
The effects of ultrasound on the dynamics of an air-water meniscus in a planar micro-geometry are investigated experimentally. The sonicated meniscus exhibits harmonic traveling waves or standing wave...
Integrable GL(2) Geometry and Hydrodynamic Partial Differential Equations
Integrable GL(2) Geometry Hydrodynamic Partial Differential Equations
2010/4/7
This article is a local analysis of integrable GL(2)-structures of degree 4. A GL(2)-structure of degree n corresponds to a distribution of rational normal cones over a manifold M of dimension (n+1). ...
Rock-slope failures in Norway;type,geometry,deformation mechanisms and stability
Rock-slope failures type geometry deformation mechanisms stability
2009/12/3
Extensive studies of Norwegian rock-slope failure areas support a subdivision into three principle types: (1) Rockfall areas, (2) rockslide areas, and (3) complex fields. The classification is based o...
Geometry of a major slump structure in the Storegga slide region offshore western Norway
Geometry major slump structure Storegga slide region western Norway
2009/12/2
A gravitational collapse structure, 155 km long with a maximum width of 35 km, has been released as a single slope failure in the Storegga region off western Norway. The released volume of sediment, w...
Visually Dynamic Presentation of Proofs in Plane Geometry Part 1. Basic Features and the Manual Input Method
Geometry theorem proving Visually dynamic presentation of proof Dynamic geometry Unordered geometry Gelernter Java Geometry Expert Morley’s theorem Feuerbach’s theorem Pythagorean theorem Pedal triangle
2013/9/9
With dynamic mediums such as computer displays, we propose a new kind of visually dynamic presentation of proofs in plane geometry. In asingle diagram for the proof, when the proof text goes on step b...