Catch-Me-If-You-Can：过冲问题和弱/暴胀层次
Catch-Me-If-You-Can: The Overshoot Problem and the Weak/Inflation Hierarchy
摘要：
我们在后暴胀弦宇宙学（特别是LVS）的背景下研究过冲问题。LVS宇宙学的特点是，随着体积模量沿着指数斜率向最终的最小值滚动，能量密度按$m_s^4$的比例缩放，有一个很长的活化期。这卷承认吸引子跟踪器的解决方案，如果这些被定位的过冲问题得到解决。我们表明，提供一个足够大的层次之间存在的通货膨胀规模和弱规模，这将总是发生在LVS作为初始种子辐射增长到跟踪器的解决方案。因此，在包含弱等级的稳定真空中结束的一致性要求偏好于高暴胀尺度--如果人们喜欢的话，这是大暴胀/弱等级的人择论证。我们讨论了各种起源，普遍的和模型相关的初始种子辐射（或物质）。一个特别有趣的例子是由膜膨胀产生的基本弦网络--这可能导致宇宙能量密度主要由引力波组成的早期时代，而LVS基本弦网络则存在于现在的宇宙中。
英文摘要：
We study the overshoot problem in the context of post-inflationary string cosmology (in particular LVS). LVS cosmology features a long kination epoch as the volume modulus rolls down the exponential slope towards the final minimum, with an energy density that scales as $m_s^4$. This roll admits attractor tracker solutions, and if these are located the overshoot problem is solved. We show that, provided a sufficiently large hierarchy exists between the inflationary scale and the weak scale, this will always occur in LVS as initial seed radiation grows into the tracker solution. The consistency requirement of ending in a stable vacuum containing the weak hierarchy therefore gives a preference for high inflationary scales -- an anthropic argument, if one likes, for a large inflation/weak hierarchy. We discuss various origins, both universal and model-dependent, of the initial seed radiation (or matter). One particularly interesting case is that of a fundamental string network arising from brane inflation -- this may lead to an early epoch in which the universe energy density principally consists of gravitational waves, while an LVS fundamental string network survives into the present universe.
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