Interaction rates in string gas cosmology
Interaction rates in string gas cosmology
复制标题
弦气体宇宙学中的相互作用率
DOI：
10.1103/physrevd.70.106010
复制
发表时间：
2004
影响因子：
5
通讯作者：
A. Mazumdar
中科院分区：
文献类型：
--
作者：
R. Danos;A. Frey;A. Mazumdar
我们研究弦的相互作用率在布兰登伯格-瓦法的情况下，非常早期的宇宙宇宙宇宙学的气体弦。这个宇宙学开始假设所有的空间维度都是紧凑的，并且最初有弦尺度半径;一些维度由于一些热或量子涨落而增长，这些涨落充当了初始膨胀速度。基于低能运动方程和弦热力学的简单论证，我们证明了弦的相互作用率是可以忽略的，因此通常的热平衡假设不适用。我们还对大半径紧致流形上弦的宇宙演化作了新的分析。然后，我们讨论修改，应考虑到通常的布兰登伯格-瓦法的情况。为了证实我们的简单论点，我们给出了一个数值计算的湮灭率的缠绕弦。在计算速率时，我们还表明小空间中弦的量子力学是重要的。
We study string interaction rates in the Brandenberger-Vafa scenario, the very early universe cosmology of a gas of strings. This cosmology starts with the assumption that all spatial dimensions are compact and initially have string scale radii; some dimensions grow due to some thermal or quantum fluctuation which acts as an initial expansion velocity. Based on simple arguments from the low-energy equations of motion and string thermodynamics, we demonstrate that the interaction rates of strings are negligible, so the common assumption of thermal equilibrium cannot apply. We also present a new analysis of the cosmological evolution of strings on compact manifolds of large radius. Then we discuss modifications that should be considered to the usual Brandenberger-Vafa scenario. To confirm our simple arguments, we give a numerical calculation of the annihilation rate of winding strings. In calculating the rate, we also show that the quantum mechanics of strings in small spaces is important.