本文選題：暗成分統(tǒng)一模型 + DBI理論��； 參考：《遼寧師范大學》2014年碩士論文

【摘要】：目前，人們通過對Ia型超新星觀測及WMAP、SDSS等精確觀測數(shù)據(jù)的分析，表明宇宙正在加速膨脹。宇宙加速膨脹在物理學中是一個解釋的焦點，對此人們提出了許多理論對標準宇宙學模型進行修正。此外，觀測數(shù)據(jù)表明在宇宙中95%的能量密度是未知的暗成分。通常認為暗成分主要包含兩部分：暗物質與暗能量�；蛘呤钦J為這兩種暗成分混合在一起，，被考慮成為一種全新未知暗流體。 在本文中，我們從弦理論作用量出發(fā)，研究DBI(Dirac-Born-Infeld)作用量下一個暗物質暗能量統(tǒng)一模型。參考模型參數(shù)的數(shù)據(jù)限制結果，我們討論在結構形成中一些宇宙學量的演化，如：密度反差和增長變量。最后，我們應用幾何診斷的方法來區(qū)分DBI暗成分統(tǒng)一模型和最流行的宇宙學常數(shù)模型。通過給出幾何量jerk參數(shù)的演化，可以看到暗成分統(tǒng)一模型與宇宙學常數(shù)模型的差別。研究表明，DBI統(tǒng)一模型可以作為解釋宇宙加速膨脹的候選者。
[Abstract]:At present, the accurate observation data such as Ia supernova observation and WMAP-SDSS show that the universe is expanding rapidly. Accelerated expansion of the universe is a focus of explanation in physics, and many theories have been proposed to modify the standard cosmological model. In addition, observations show that 95% of the energy density in the universe is an unknown dark component. It is generally believed that the dark component consists of two parts: dark matter and dark energy. Or the two dark components are considered to be a new unknown dark fluid. In this paper, we study a unified model of dark matter dark energy under the action quantity of DBI Dirac-Born-Infeld. Referring to the data limitation results of the model parameters, we discuss the evolution of some cosmological variables in the formation of the structure, such as density contrast and growth variables. Finally, we use the geometric diagnosis method to distinguish the DBI dark component unified model from the most popular cosmological constant model. By giving the evolution of jerk parameters of geometric variables, we can see the difference between the unified dark component model and the cosmological constant model. It is shown that the unified model can be used as a candidate to explain the accelerating expansion of the universe.
【學位授予單位】：遼寧師范大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：P159;P145.9

【相似文獻】

相關期刊論文 前1條

1 井明艷,孫建義;安定結合抑制蛋白(DBI)的研究進展[J];生物化學與生物物理進展;2003年06期

本文編號：1796119