搜索结果: 136-150 共查到“理学 universe”相关记录197条 . 查询时间(0.093 秒)
A universe of processes and some of its guises
universe of processes guises
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2010/12/16
Our starting point is a particular `canvas' aimed to `draw' theories of physics,which has symmetric monoidal categories as its mathematical backbone. In this paper we consider the conceptual foundatio...
Energy in an Expanding Universe in the Teleparallel Geometry
Gravitation teleparallelism gravitational energy- momentum tensor
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2010/6/30
The main purpose of this paper is to explicitly verify the consistency of the energy-momentum and angular momentum tensor of the gravitational field established in the Hamiltonian structure of the Tel...
Mysterious 'dark flow' at the edge of the universe（图）
'dark flow' the edge of the universe
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2010/3/26
Astronomers have found that whole clusters of galaxies are moving in convoy towards a single point in the sky. This unexpected motion appears to be separate from the expansion of the universe and the ...
Life beyond our universe（图）
Life our universe a longstanding mystery
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2010/2/24
Whether life exists elsewhere in our universe is a longstanding mystery. But for some scientists, there’s another interesting question: could there be life in a universe significantly different from o...
Gravitational Charged Perfect Fluid Collapse in Friedmann Universe Models
Electric field Gravitational collapse Cosmological constant Friedmann models
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2010/3/18
This paper is devoted to study the gravitational charged perfect fluid collapse in the Friedmann universe models with cosmological constant. For this purpose, we assume that the electromagnetic field ...
Geometry of the quantum universe
causal dynamical triangulation
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2010/3/19
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...
Mixmaster universe in the z=3 deformed Hořava-Lifshitz gravity
Hoˇrava-Lifshitz gravity quantum gravity mixmaster universe
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2010/3/18
The z=3 deformed Horava-Lifshitz gravity with coupling constants \omega and \epsilon leads to a nonrelativistic "mixmaster" cosmological model. The potential of theory is given by the sum of IR and UV...
Expanding Universe and its manifestations beyond the General Relativity
Expanding Universe General Relativity
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2010/3/18
It has been demonstrated that a modern stage of the Universe expansion may be described in accordance with the observations within the scope of the space-time conformal geometry. The clock synchroniza...
Varying couplings in the early universe: correlated variations of $\alpha$ and $G$
early universe Planck satellite mission
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2010/3/19
The Cosmic Microwave Background anisotropies provide a unique opportunity to constrain simultaneous variations of the fine-structure constant $\alpha$ and Newton's gravitational constant $G$. Those co...
Why Does the Universe Expand ?
Universe Expand gravity
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2010/3/18
The purpose of the paper is five-fold: (a) Argue that the question in the title can be presented in a meaningful manner and that it requires an answer. (b) Discuss the conventional answers and explain...
Quiescent cosmology and the final state of the universe
Quiescent cosmology final state universe
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2010/3/18
It has long been a primary objective of cosmology to understand the apparent isotropy in our universe and to provide a mathematical formulation for its evolution. A school of thought for its explanati...
Viscous Quark-Gluon Plasma in the Early Universe
Quark-Gluon Plasma Early Universe
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2010/3/18
We consider the evolution of a flat, isotropic and homogeneous Friedmann-Robertson-Walker Universe, filled with a causal bulk viscous cosmological fluid, that can be characterized by an ultra-relativi...
The Holographic Universe
Holographic Universe quantum field theory
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2010/3/19
We present a holographic description of four-dimensional single-scalar inflationary universes in terms of a three-dimensional quantum field theory. The holographic description correctly reproduces sta...
NASA's New Museum Grant Allies Will Make the Universe Accessible to Families From Alaska to Florida
NASA's New Museum Grant Allies the Universe Families Alaska Florida
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2010/1/19
Interactive museum exhibits about climate change, Earth science, and missions beyond Earth are among the projects NASA has selected to receive agency funding. Nine informal education providers from Al...
Stability of the Einstein static universe in modified theories of gravity
Einstein static universe modified theories of gravity
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2010/3/17
We present a brief overview of the stability analysis of the Einstein static universe in various modified theories of gravity, like f(R) gravity, Gauss-Bonnet or f(G) gravity, and Horava-Lifshitz grav...