搜索结果: 76-90 共查到“运动宇宙学”相关记录139条 . 查询时间(5.452 秒)
Towards a fully consistent parameterization of modified gravity
fully consistent parameterization modified gravity
2011/9/27
There is a distinct possibility that current and future cosmological data can be used to constrain Einstein's theory of gravity on the very largest scales. To be able to do this in a model-independent...
Cosmological Perturbation Theory With Background Anisotropic Curvature
Cosmological Perturbation Theory Background Anisotropic Curvature
2011/10/18
The theory of cosmological perturbations is extended to spacetimes displaying isotropic expansion but anisotropic curvature. The perturbed Einstein equation and Boltzmann equations for massless and ma...
The dark matter assembly of the Local Group in constrained cosmological simulations of a LambdaCDM universe
galaxies: haloes cosmology: theory methods: N-body simulations
2011/9/26
We make detailed theoretical predictions for the assembly properties of the Local Group (LG) in the standard LambdaCDM cosmological model. We use three cosmological N-body dark matter simulations from...
英国绘制最完整宇宙3D图 广度达3.8亿光年（图）
英国 完整 宇宙 3D图
2011/5/30
英国天文学家最近公布了迄今为止最完整的3D版宇宙图像，这份英国普兹茅斯大学的MASS红移巡天图(2MRS)广度达到3.8亿光年，历时10年多测绘而成。这份星系图比之前绘制的图像更接近银道面。
Circular patterns within the cosmic microwave background suggest that space and time did not come into being at the Big Bang but that our universe in fact continually cycles through a series of "aeons...
A step closer to Big Bang conditions?（图）
Big Bang conditions the Large Hadron Collider High Energy Physics
2010/10/13
Since December, the Large Hadron Collider (LHC) has been smashing particles together at record-setting energy levels. Physicists hope that those high-energy collisions could replicate the conditions s...
首张全天域宇宙辐射图揭秘宇宙起源变迁（图）
首张 全天域宇宙辐射图 宇宙起源变迁
2010/7/14
据《每日邮报》报道，欧洲科学家利用“普朗克”天文望远镜完成首张全天域宇宙微波背景辐射图，这张辐射图成功捕捉到宇宙大爆炸遗留痕迹，将为研究宇宙起源演化的过程提供巨大帮助。据报道，这张历时6个月完成的宇宙辐射图全景展示了孕育人类的银河系的现状，同时提供了宇宙形成之初的珍贵信息。图像上遍布于整个银河的宇宙尘埃网络是正在形成或已经开始其生命历程的新星的摇篮。
美国确认宇宙射线由质子组成
美国 宇宙射线 质子
2010/7/7
美国研究人员在最新一期《物理评论快报》上报告称，他们使用位于犹他州的高分辨率蝇眼阵列望远镜，确认高能的宇宙射线由质子组成。美国的高分辨率蝇眼探测器（HiRes）位于犹他州盐湖城西的沙漠中，使用高分辨率的蝇眼探测器，科学家确认，在每个原子核中发现的带正电的成分（质子）组成了宇宙射线，而之前，科学家并不能确认这一点。
犹他州立大学的一名研究人员表示，该HiRes探测器采用立体观测技术，甚至能够探测这...
Domain Wall, Stiff Matter and Ultra-Relativistic Particles from a Generalized Double-Component Dark Energy Model
Super-accelerated expansion dark energy domain wall cosmic string stiff matter
2010/6/30
This letter discusses a modified Friedmann-Robertson-Walker cosmology in which the equation of state behaves like p = 3hamrn r; (h;m;n) 2 R. Many interesting features are revealed in particu...
Michael Turner to direct Kavli Institute for Cosmological Physics（图）
Michael Turner Kavli Institute Cosmological Physics
2010/4/29
The University of Chicago has named Michael S. Turner as director of its Kavli Institute for Cosmological Physics, effective March 29, in an ongoing commitment to probing some of the most puzzling sci...
Energy in an Expanding Universe in the Teleparallel Geometry
Gravitation teleparallelism gravitational energy- momentum tensor
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
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 ...
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
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 ...
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...