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arXiv 1010.4099hep-th
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D-膜的宇宙演化

Cosmological evolution of a D-brane

Huiquan Li

备注：
13 pages
发表信息：
Phys.Rev.D83:066002,2011
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摘要：

本文研究了Chaubergin气体宇宙学模型中单个BPS D膜在无势情况下的宇宙学演化。当这样一个与引力耦合的D-膜以非零的速度在体块中运动时，它往往会通过引力波泄漏到体块等机制减速到零速度，失去它的动能来为D-膜上的宇宙膨胀提供燃料。如果D膜的初速度足够高，D膜上的宇宙在早期会经历一个类似尘埃的阶段，而在晚期会经历一个加速阶段，就像在最初的Chaubergin气体模型中观察到的那样。当D-膜的速度初始为零时，D-膜将始终保持固定在整体中的某个位置，膜张力对普朗克质量的平方为宇宙学常数。有趣的是，这种固定膜宇宙可以在高出一维的非BPS D膜上作为快子暴胀的缺陷而产生，我们研究了在没有势的情况下与引力耦合的单个BPS D膜的宇宙学演化。当这样一个D-膜以非零的速度在体中运动时，它往往会通过引力波泄漏到体中的机制减速到零速度，失去它的动能来为D-膜上的宇宙膨胀提供燃料。如果D-膜的初速度足够高，D-膜上的宇宙在早期经历了一个类似尘埃的阶段，在晚期经历了一个加速阶段，实现了最初的Chaubergin气体模型。当D-膜的速度初始为零时，D-膜将始终保持固定在整体中的某个位置，膜张力对普朗克质量的平方为宇宙学常数。进一步证明了这种固定膜宇宙可以作为高一维的非BPS D膜上快子暴胀的缺陷而产生。

英文摘要：

We study the cosmological evolution of a single BPS D-brane in the absence of potential, which is in the category of the Chaplygin gas cosmological model. When such a D-brane coupled to gravity moves in the bulk with a non-vanishing velocity, it tends to slow down to zero velocity via mechanisms like gravitational waves leakage to the bulk, losing its kinetic energy to fuel the expansion of the universe on the D-brane. If the initial velocity of the D-brane is high enough, the universe on the D-brane undergoes a dust-like stage at early times and an acceleration stage at late times, as observed in the original Chaplygin gas model. When the D-brane velocity is initially zero, the D-brane will always remain fixed at some position in the bulk, with the brane tension over the Plank mass squared as a cosmological constant. Interestingly, this kind of fixed brane universe can arise as defects from tachyon inflation on a non-BPS D-brane with one dimension higherWe study the cosmological evolution of a single BPS D-brane coupled to gravity in the absence of potential. When such a D-brane moves in the bulk with non-vanishing velocity, it tends to slow down to zero velocity via mechanisms like gravitational wave leakage to the bulk, losing its kinetic energy to fuel the expansion of the universe on the D-brane. If the initial velocity of the D-brane is high enough, the universe on the D-brane undergoes a dust-like stage at early times and an acceleration stage at late times, realising the original Chaplygin gas model. When the D-brane velocity is initially zero, the D-brane will always remain fixed at some position in the bulk, with the brane tension over the Plank mass squared as a cosmological constant. It is further shown that this kind of fixed brane universe can arise as defects from tachyon inflation on a non-BPS D-brane with one dimension higher.

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