暗能量及其熱力學(xué)性質(zhì)的研究
[Abstract]:The accelerated expansion of the universe is a basic fact of contemporary cosmology, which has been confirmed by many observational data, such as Ia supernova, cosmic microwave background radiation, Keelung digital celestial measurement, cosmic large scale and so on. At the same time, it has also become a focus and hot spot of cosmology. For the phenomenon of accelerated expansion of the universe, a widely accepted explanation is that there is a uniform distribution of a special material called dark energy in the universe, which has a strong negative pressure, which promotes the accelerated expansion of the universe. In addition, there are also modified gravity theory and extra dimension theory to explain the accelerated expansion of the universe. In this paper, the basic knowledge of cosmology is introduced (chapter 2), including cosmological principles, standard cosmological models and inflationary cosmological models, as well as several common dark energy models and modified gravitational theories that explain the accelerated expansion of the universe. Then it introduces our main research work (chapters III to V). Firstly, we study the evolution behavior of modified variable Chaplygin Gas model and interaction modified variable Chaplygin Gas model (Chapter 3). The cosmological parameters in the model, the dark energy state parameter wde, the energy density ratio of each material and the deceleration factor Q, are analyzed in detail. In addition, since the combination of growth index f and Hubble parameter H (z) can provide important information to explore the properties of dark energy and the formation of cosmic structure, we also discuss the evolution characteristics of growth index f in modified variable Chaplygin Gas model. Finally, the Statefinder parameter diagnosis method for discriminating dark energy model is introduced, and the interaction VMCG model is diagnosed by Liyue (?) Statefinder parameter. On the other hand, the universe can be regarded as a large thermodynamic system under the local equilibrium. We study and discuss the properties of dark energy from the thermodynamic point of view (Chapter 5). Specifically, in the parametric dark energy model w=wo w1 (?), whether the generalized thermodynamic law is valid in the universe with apparent horizon and event horizon envelope is discussed. In addition, we use Markov Chain Monte Carlo method, using the current astronomical observation data: SNIa supernova, baryons sound velocity oscillatory (BAO), The observed Hubble data (OHD) and cosmic microwave background radiation (CMB) limit the parameters of the modified variable Chaplygin Gas model (Chapter 4). By using these restricted parameters, the generalized thermodynamic properties of the universe with apparent horizon, event horizon and particle horizon envelope in the modified variable Chaplygin Gas model are discussed (Chapter 5). Finally, we give the conclusion and prospect of this paper.
【學(xué)位授予單位】:大連理工大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2012
【分類號(hào)】:P159
【共引文獻(xiàn)】
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