搜索结果: 1-15 共查到“知识库 宇宙大尺度结构起源与演化”相关记录19条 . 查询时间(3.047 秒)
Precision simulation of ground-based lensing data using observations from space
methods: data analysis – techniques: image processing – gravitational lensing: weak – galaxies: structure
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2011/10/13
Current and upcoming wide-field, ground-based, broad-band imaging surveys promise to address a wide range of outstanding problems in galaxy formation and cosmology. Several such uses of ground-based d...
Neutral and charged matter in equilibrium with black holes
Neutral charged matter equilibrium black holes
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2011/10/14
We study the conditions of a possible static equilibrium between spherically symmetric, electrically charged or neutral black holes and ambient matter. The following kinds of matter are considered: (1...
Probe combination in large galaxy surveys : Application of Fisher information and Shannon entropy to weak lensing
cosmology: cosmological parameters cosmology: large-scale structure of the Universe methods: data analysis methods: statistical
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2011/9/27
This paper is aimed at developing a better understanding of the structure of the information that in contained in galaxy surveys, so as to find optimal ways to combine observables from such surveys. W...
Avoiding bias in reconstructing the largest observable scales from partial-sky data
Avoiding bias reconstructing largest observable partial-sky data
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2011/10/18
Obscuration due to Galactic emission complicates the extraction of information from cosmological surveys, and requires some combination of the (typically imperfect) modeling and subtraction of foregro...
从理论上分析了标准模型中q0参数的数值范围，讨论了q0参数对宇宙演化的影响，理论分析与观测结果符合。
WMAP 7 year constraints on CPT violation from large angle CMB anisotropies
CMBR theory CMBR experiments
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2011/10/18
We constrain the rotation angle $\alpha$ of the linear polarization of CMB photons using the large angular scale (up to $\sim 4^\circ$) signal in WMAP 7 year data. At these scales, the CMB polarizatio...
Lookback time and Chandra constrains on cosmological parameters
Cosmological parameters WMAP measurements lookback time dark energy Monte Carlo Markov Chains
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2011/10/19
In this paper we combine the WMAP7 with lookback time and Chandra gas fraction data to constrain the main cosmological parameters and the equation of state for the dark energy. We find that the lookba...
Magnetized LambdaCDM inhomogeneities and the cosmic dark ages
Magnetized inhomogeneities cosmic dark ages
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2011/10/13
Exact solutions of the perturbations equations in the magnetized LambdaCDM scenario are presented. They apply during the dark ages and, more specifically, after the baryons are freed from the drag of ...
Weak-field limit of Kaluza-Klein models with spherical compactification II: agreement with the observations
Weak-field limit Kaluza-Klein models spherical compactification agreement observations
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2011/10/17
We investigate the classical gravitational tests for the Kaluza-Klein model with spherical (of a radius $a$) compactification of the internal space. The model contains also a bare cosmological constan...
Enlargement of the Transformation Group of General Relativity: Spherically Symmetric Solutions
Gravity theory, transformation groups Lagrangians fi eld equations stellar model external spherically symmetric solutions
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2011/10/18
A theory has been presented previously in which the geometrical structure of a real four-dimensional space time manifold is expressed by a real orthonormal tetrad, and the group of diffeomorphisms is ...
Higgs-Dilaton Cosmology: From the Early to the Late Universe
Infl ationary Cosmology Dark Energy Unimodular Gravity Scale Invariance Dilaton Higgs Infl ation
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2011/10/18
We consider a minimal scale-invariant extension of the Standard Model of particle physics combined with Unimodular Gravity formulated in \cite{Shaposhnikov:2008xb}. This theory is able to describe not...
Cosmology today-A brief review
Theoretical cosmology Observational cosmology
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2011/9/30
This is a brief review of the standard model of cosmology. We first introduce the FRW models and their flat solutions for energy fluids playing an important role in the dynamics at different epochs. W...
Cosmic-ray physics with IceCube
cosmic rays air showers composition
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2011/9/29
IceCube as a three-dimensional air-shower array covers an energy range of the cosmic-ray spectrum from below 1 PeV to approximately 1 EeV. This talk is a brief review of the function and goals of IceT...
Using Big Bang Nucleosynthesis to Extend CMB Probes of Neutrino Physics
neutrino masses from cosmology big bang nucleosynthesis cosmological parameters from CMBR
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2010/3/22
We present calculations showing that upcoming Cosmic Microwave Background (CMB) experiments will have the power to improve on current constraints on neutrino masses and provide new limits on neutrino ...
The No-Boundary Measure in the Regime of Eternal Inflation
no-boundary wave function inflationary histories cosmology infinite universes
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2010/3/18
The no-boundary wave function (NBWF) specifies a measure for prediction in cosmology that selects inflationary histories and remains well behaved for spatially large or infinite universes. This paper ...