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arXiv 0907.3457gr-qc
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具有真空能量的非奇异宇宙

A non-singular universe with vacuum energy

M. B. Altaie, U. Al-Ahmad

摘要:

我们在非零宇宙学常数存在的Robertson-Walker时空背景中,基于有限温度下量子场的存在性,构造了一个宇宙模型。我们讨论了真空制度的光通过以前的研究所获得的结果,在静态爱因斯坦宇宙中的无质量量子场的反反应,我们认为,绝热真空状态和热平衡是实现整个制度。结果表明,这种模型可以解释早期宇宙和现在宇宙的许多特征。该模型不受标准弗里德曼宇宙学的基本问题的影响,并且是非奇异的,但涉及以与宇宙大小成比例的速率连续创造能量,这低于稳态宇宙学所建议的速率。

英文摘要:

We construct a model for the universe based on the existence of quantum fields at finite temperature in the background of Robertson-Walker spacetime in presence of a non-zero cosmological constant. We discuss the vacuum regime in the light of the results obtained through previous studies of the back-reaction of massless quantum fields in the static Einstein universe, and we argue that an adiabatic vacuum state and thermal equilibrium is achieved throughout this regime. Results shows that such a model can explain many features of the early universe as well as the present universe. The model is free from the basic problems of the standard Friedmann cosmology, and is non-singular but involves a continuous creation of energy at a rate proportional to the size of the universe, which is lower than that suggested by the steady-state cosmology.

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