Drans-Dicke理論及其標(biāo)量場(chǎng)解析勢(shì)的研究
[Abstract]:In recent years, through astronomical observations such as Type 1a supernova, cosmic microwave background radiation anisotropy detector and cosmic large-scale structure, we can see that our universe is speeding up expansion, and why is the universe accelerating to expand? It has become one of the hot topics in cosmology research. One of the most common explanations for the accelerating expansion of the universe is that the universe contains a special substance called dark energy, which has a negative pressure, and it is the existence of this negative pressure that promotes the accelerated expansion of the universe. In addition, there is a modified gravitational theory to explain the accelerating expansion of the universe. The accelerating expansion of the universe challenges the standard cosmological model based on Einstein's general relativity. The substitution and modification of some generalized relativistic gravity theories has been continuously searched for and studied. Brans-Dicke (BD) theory is one of the substitution theories of general relativity. BD theory, as a scalar Zhang Liang theory, can be expressed under two frames. Jordan frame and Einstein frame respectively. Under the Einstein frame, the BD scalar field is not coupled with the geometric quantity -Ricci scalar R, but it interacts with the material system. This irregular coupling does not correspond to the Einstein gravity, which implies that the energy and momentum Zhang Liang of the mass and scalar field are not conserved. Under the Jordan frame, the BD scalar field is coupled with R. The BD theory under two frames can be related by conformal transformation. We have studied cosmology with analytical potential of BD scalar field under two frames. The evolution of BD scalar potential and the difference of potential energy of BD scalar field under two frames are discussed based on the parameter fitting values obtained from astronomical observations.
【學(xué)位授予單位】:遼寧師范大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:P159
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