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国家自然科学基金(10873004)

作品数:18 被引量:6H指数:2
相关作者:王永久龚添喜陈菊华李爱根曹广涛更多>>
相关机构:湖南师范大学湖南科技大学更多>>
发文基金:国家自然科学基金国家重点基础研究发展计划湖南省教育厅科研基金更多>>
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18 条 记 录,以下是 1-10
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整体单极子黑洞引力场中的加速效应
2012年
给出了含有整体单极子的黑洞的引力场中试验粒子加速度的表达式,讨论了整体单极子对加速效应的贡献.结果表明,由于整体单极子的存在,产生了斥力效应;当速度趋近于光速时,中性粒子在引力场中受到了斥力作用.这是牛顿力学中所没有的.
邵建舟王永久
关键词:广义相对论引力效应
一类无奇点宇宙模型被引量:3
2010年
按照Penrose-Hawking的奇点定理,在场源物质无旋、无加速且能量密度满足条件ρ+3p≥0的宇宙模型中一定存在奇点.本文研究了场源物质有旋时的无奇点宇宙模型,获得了几种无奇点的宇宙解.
王永久李爱根龚添喜陈菊华
关键词:广义相对论宇宙模型
Effects of dark energy interacting with massive neutrinos and dark matter on universe evolution
2010年
In this paper we investigate the evolution of the cosmology model with dark energy interacting with massive neutrinos and dark matter. Using the numerical method to investigate the dynamical system, we find that the stronger the interaction between dark energy and dark matter, the lower the ratio of dark matter in the universe is; also, the stronger the interaction between dark energy and massive neutrinos, the lower the ratio of massive neutrinos in the universe is. On the other hand, the interaction between dark energy and dark matter or massive neutrinos has an effect on disturbing the universe's acceleration; we also find that our universe is still accelerating.
陈菊华王永久
Quasinormal modes of the scalar field in five-dimensional Lovelock black hole spacetime
2010年
In this paper, using the third-order WKB approximation, we investigate the quasinormal frequencies of the scalar field in the background of a five-dimensional Lovelock black hole. We find that the ultraviolet correction to Einstein theory in the Lovelock theory makes the scalar field decay more slowly and oscillate more quickly, and the cosmological constant makes the scalar field decay more slowly and oscillate more slowly in the Lovelock black hole background.
陈菊华王永久
包围有暗能量黑洞的Hawking辐射修正
2010年
运用由Banerjee和Majhi所发展的非半经典近似的Hamiliton-Jacobi方法,计算了被暗能量包围的黑洞温度和熵,得到了修正后的温度和熵.在修正后的熵中,面积定理包含面积对数修正和面积幂的倒数。
龚添喜王永久
关键词:HAWKING辐射暗能量黑洞
Time-like geodesic structure of a spherically symmetric black hole in the brane-world被引量:1
2011年
Recently Malihe Heydari-Fard obtained a spherically symmetric exterior black hole solution in the brane-world scenario, which can be used to explain the galaxy rotation curves without postulating dark matter. By analysing the particle effective potential, we have investigated the time-like geodesic structure of the spherically symmetric black hole in the brane-world. We mainly take account of how the cosmological constant α and the stellar pressure β affect the time-like geodesic structure of the black hole. We find that the radial particle falls to the singularity from a finite distance or plunges into the singularity, depending on its initial conditions. But the non-radial time-like geodesic structure is more complex than the radial case. We find that the particle moves on the bound orbit or stable (unstable) circle orbit or plunges into the singularity, or reflects to infinity, depending on its energy and initial conditions. By comparing the particle effective potential curves for different values of the stellar pressureβ and the cosmological constant α, we find that the stellar pressure parameter β does not affect the time-like geodesic structure of the black hole, but the cosmological constant a has an impact on its time-like geodesic structure.
周盛陈菊华王永久
Scattering and absorption of particles by a black hole involving a global monopole被引量:1
2012年
Under the conditions that the wavelength of a particle is much larger than its radius of central mass, and the Schwarzschild field is weak, the scattering of a particle has been studied by many researchers. They obtained that scalar and vector particles abide by Rutherford's angle distribution by using the low level perturbation method and the scattered field's approximation in a weak field. The scattering cross section of a photon coincides with the section in Newton's field of point mass. We can obtain the photon's polarization effect by calculating the second-order perturbation in the linear Schwarzschild field. This article discusses the scattering and absorption of a particle by a black hole involving a global monopole by using the aforesaid method.
邵建舟王永久
关键词:SCATTERINGABSORPTION
Interference phase of mass neutrino in CM space-time
2009年
In the gravitational field of central mass with electric and magnetic charges and magnetic moment (CM spacetime), this paper calculates the interference phase of mass neutrino along geodesic in the radial direction, and discusses the contribution of the electric and magnetic charges and magnetic moment of the central mass to the phase.
陈霞王永久
Absorption cross section of black holes with global monopole
2013年
We study the absorption problem for a massless scalar field propagating in general static spherically-symmetric black holes with a global monopole. The absorption cross section expression is provided using a partial-wave method, which permits us to make an elegant and powerful resummation of the absorption cross section, and to extract the physical information encoded in the sum over the partial-wave contributions.
黄海王永久陈菊华
含整体单极子黑洞场中的吸附和辐射
2011年
本文研究了在含整体单极子的黑洞场中质量亏损效应,计算了被吸附的(落向质量中心的)中性粒子的质量亏损,进而计算了被吸附的质量球壳以及极限情况下质量球的质量亏损.这些物质的质量亏损最终将转化为能量辐射.
向茂槐陈菊华王永久
关键词:广义相对论黑洞
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