暗能量及其相关问题的研究
发布时间：2018-11-12 12:51
【摘要】： 近年来大量的天文观测表明宇宙正在加速膨胀。具有负压强的奇异物质暗能量成为了宇宙的主导成分。它均匀地分布在整个空间中,为宇宙的加速膨胀提供原动力。尽管人们对暗能量有了初步的认识,但是对它本质的了解却不多。暗能量已经成为了物理学研究中最重要的问题之一。 论文首先介绍了宇宙学的背景和标准宇宙学模型,然后对几种比较流行的暗能量模型做了简单介绍。 接着,主要研究有理想流体存在时标量场的动力学。由一个标量场来推动宇宙加速膨胀的动力学暗能量模型往往会遇到所谓的精细调节以及巧合性问题。为了解决这些问题,可以引入多组分的模型来求解标度解。在本文中,首先介绍标量场暗能量的自治系统,然后着重讨论了时空弯曲下有理想流体存在时快子暗能量的动力学,并求解标度解,通过对标度解的研究,确定它是稳定的还是短暂的。最后分别在开放宇宙和闭合宇宙两种可能的情况下探讨标度解的势具有什么样的形式及其演化。 另外,我们也研究和探讨暗能量的存在对行星进动角的影响。发现对于太阳系水星,暗能量对其进动角的贡献大约为总进动角的万分之一。因此,期望通过对水星进动的精密观测,可以推测暗能量的状态函数,并以此作为检验各种暗能量模型的理论依据。 最后是总结与展望,对整篇论文进行总结,并展望未来工作。
[Abstract]:A large number of astronomical observations in recent years have shown that the universe is expanding at an accelerated pace. The dark energy of singular matter with strong negative pressure has become the dominant component of the universe. It distributes evenly throughout the space, providing the impetus for the accelerating expansion of the universe. Although there is a preliminary understanding of dark energy, little is known about its nature. Dark energy has become one of the most important problems in physics. In this paper, the background and standard cosmological models of cosmology are introduced, and then several popular dark energy models are briefly introduced. Then, the dynamics of scalar field in the presence of ideal fluid is studied. Dynamic dark energy models with a scalar field to accelerate the expansion of the universe often encounter so-called fine-tuning and coincidences. In order to solve these problems, a multicomponent model can be introduced to solve the scale solution. In this paper, the autonomous system of dark energy in scalar field is introduced, and then the dynamics of the fast dark energy in the existence of ideal fluid in space-time bending is discussed, and the scalar solution is solved. Make sure it's stable or transient. Finally, in the open universe and the closed universe, we discuss the potential of the scalar solution and its evolution. In addition, we also study and study the influence of dark energy on planetary precession angle. It is found that the contribution of dark energy to the precession angle of Mercury in the solar system is about 1/10000 of the total precession angle. Therefore, it is expected that the state function of dark energy can be inferred through the precise observation of Mercury precession, and this can be used as the theoretical basis for testing various dark energy models. The last part is the summary and prospect of the whole paper, and the prospect of future work.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2010
【分类号】：P145.9
[Abstract]:A large number of astronomical observations in recent years have shown that the universe is expanding at an accelerated pace. The dark energy of singular matter with strong negative pressure has become the dominant component of the universe. It distributes evenly throughout the space, providing the impetus for the accelerating expansion of the universe. Although there is a preliminary understanding of dark energy, little is known about its nature. Dark energy has become one of the most important problems in physics. In this paper, the background and standard cosmological models of cosmology are introduced, and then several popular dark energy models are briefly introduced. Then, the dynamics of scalar field in the presence of ideal fluid is studied. Dynamic dark energy models with a scalar field to accelerate the expansion of the universe often encounter so-called fine-tuning and coincidences. In order to solve these problems, a multicomponent model can be introduced to solve the scale solution. In this paper, the autonomous system of dark energy in scalar field is introduced, and then the dynamics of the fast dark energy in the existence of ideal fluid in space-time bending is discussed, and the scalar solution is solved. Make sure it's stable or transient. Finally, in the open universe and the closed universe, we discuss the potential of the scalar solution and its evolution. In addition, we also study and study the influence of dark energy on planetary precession angle. It is found that the contribution of dark energy to the precession angle of Mercury in the solar system is about 1/10000 of the total precession angle. Therefore, it is expected that the state function of dark energy can be inferred through the precise observation of Mercury precession, and this can be used as the theoretical basis for testing various dark energy models. The last part is the summary and prospect of the whole paper, and the prospect of future work.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2010
【分类号】：P145.9
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