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Variational Minimizing Solutions for Planar Circular Restricted 3-Body Problems
Restricted 3–body problems “8”type loops Variational methods
2011/9/25
We use some inequalities to study planar Newtonian circular restricted 3- body problems with two equal primaries, we prove that the minimizer of the Lagrangian action on “8” type symmetric loop spaces...
New Periodic Solutions for Planar 5–Body and 7-Body Problems
5-body and 7-body problems winding numbers variational minimizers
2011/9/25
For planar Newtonian N + 2-body (N=3,5)problems with some mass ratios, we prove the existence of new non-collision periodic solutions such that N bodies with equal masses move on one loop and the othe...
脉冲星自转周期不稳定的研究
脉冲星 频率稳定度 时间噪声 自转突变
2011/9/25
本文讨论了脉冲星自转周期的不稳定性，为脉冲星脉冲到达时间的分析模型提供理论依据，并着重分析了不规则减速中的时间噪声和自转突变问题，为研究脉冲星内部结构和定义高精度的脉冲星时提供宝贵的信息。
原恒星吸积盘的数值模拟
原行星 吸积盘 数值模拟
2011/9/25
这篇论文的主要目的是用流体力学方法模拟在一个原恒星的吸积盘中加入一颗行星后吸积盘的演化过程。由于背景知识的限制，我们没有对吸积盘的具体物理过程或者具体物理量进行讨论，我们把这个程序作为一种训练以及日后做深入研究的一个工具。为了保证其可靠性，我们将得到的结果与几个已经比较成熟的结果(例如.Kley 1999 )进行了比较。最后我们得出结论，我们的程序是可靠的。
Shear-flexion cross-talk in weak-lensing measurements
gravitational lensing, methods: data analysis, cosmology: observations
2011/10/12
Gravitational flexion, caused by derivatives of the gravitational tidal field, is potentially important for the analysis of the dark-matter distribution in gravitational lenses, such as galaxy cluster...
Toward Early-Warning Detection of Gravitational Waves from Compact Binary Coalescence
Detection Gravitational Waves Compact Binary Coalescence
2011/10/9
Rapid detection of compact binary coalescence with a network of advanced gravitational-wave detectors will offer a unique opportunity for multi-messenger astronomy. Prompt detection alerts for the ast...
Randall-Sundrum limit of f(R) brane-world models
Randall-Sundrum limit brane-world models
2011/10/17
By setting some special boundary conditions in the variational principle we obtain junction conditions for the five-dimensional $f(R)$ gravity which in the Einstein limit $f(R)\rightarrow R$ transform...
Structure Function and Variability Mechanism of Quasars from SDSS Stripe 82
Structure Function Variability Mechanism Quasars
2011/10/13
Theoretical predictions for the ensemble quasar structure function are tested using multi-epoch observations of Stripe 82 collected by the Sloan Digital Sky Survey. We reanalyze the entire available v...
An algorithm is proposed for constructing a group (ensemble) pulsar time based on the application of optimal Wiener filters. This algorithm makes it possible to separate the contributions of variation...
Galaxy-Scale Outflows Driven by Active Galactic Nuclei
Galaxy-Scale Outflows Driven Active Galactic Nuclei
2011/10/20
We present hydrodynamical simulations of major mergers of galaxies and study the effects of winds produced by active galactic nuclei (AGN) on interstellar gas in the AGN's host galaxy. Motivated by th...
Astrometric Image Centroid Displacements due to Gravitational Microlensing by the Ellis Wormhole
Astrometric Image Centroid Displacements due to Gravitational Microlensing by the Ellis Wormhole
2011/10/17
Continuing work initiated in an earlier publication (Abe, ApJ, 725 (2010) 787), we study the gravitational microlensing effects of the Ellis wormhole in the weak-field limit. First, we find a suitable...
Existence of Equilibrium Points and their Linear Stability in the Generalized Photogravitational Chermnykh-Like Problem with Power-law Profile
Existence of Equilibrium Points and their Linear Stability in the Generalized Photogravitational Chermnykh-Like Problem with Power-law Profile
2011/10/14
We consider the modified restricted three body problem with power-law density profile of disk, which rotates around the center of mass of the system with perturbed mean motion. Using analytical and nu...
Applications of muon signal to electromagnetic signal showers universality for mass composition and hadronic interactions studies
shower universality muon signal electromagnetic signal hadronic interactions mass composition
2011/10/20
We present the first results of the application of the recently found universality of behavior of muon signal to electromagnetic (EM) signal ratio with respect to the vertical depth of showers maximum...
Photospheric Signatures of Granular-scale Flux Emergence and Cancellation at the Penumbral Boundary
Photospheric Signatures Granular-scale Flux Emergence Cancellation Penumbral Boundary
2011/10/13
We studied flux emergence events of sub-granular scale in a solar active region. New Solar Telescope (NST) of Big Bear Solar Observatory made it possible to clearly observe the photospheric signature ...
Modified gravity approach based on a preferred time foliation
Modified gravity approach based preferred foliation
2011/10/14
We propose, in a heuristic way, a relativistic modified gravity model as an alternative to particle dark matter at galactic scales. The model is based on a postulated preferred time foliation describe...