弦精化模型中saxion-axion系统的渐近行为
Asymptotic behavior of saxion-axion system in stringy quintessence model
AI总结：
本文研究弦精化模型中saxion-axion系统的慢滚参数晚期行为，发现axion可通过耦合运动、其动能贡献不可忽略，且不动点至多部分稳定，saxion-axion对越多稳定性越难实现。
摘要：
本文研究了弦精化（stringy quintessence）模型中，当saxion与axion均可运动时慢滚参数的晚期演化行为。尽管树级势与axion无关，但axion可通过与saxion的耦合及背景几何产生运动。当慢滚近似不成立时，axion动能对慢滚参数和真空能密度的贡献不可忽略。由于场空间维度加倍，慢滚参数时间变化率为零的不动点并非始终稳定。研究发现，saxion-axion系统中的不动点至多是部分稳定的，尤其当纳入弦紧致化的核心组分——体积模与axio-dilaton时更是如此。研究表明，考虑的saxion-axion对越多，实现不动点的稳定性就越困难。
英文摘要：
The late time behavior of the slow-roll parameter in the stringy quintessence model is studied when axion as well as saxion are allowed to move. Even though the potential is independent of the axion at tree level, the axion can move through its coupling to the saxion and the background geometry. Then the contributions of the axion kinetic energy to the slow-roll parameter and the vacuum energy density are not negligible when the slow-roll approximation does not hold. As the dimension of the field space is doubled, the fixed point at which the time variation of the slow-roll parameter vanishes is not always stable. It is found that the fixed point in the saxion-axion system is at most partially stable, in particular when the volume modulus and the axio-dilaton, the essential ingredients of the string compactification, are taken into account. It seems that as more saxion-axion pairs are considered, achieving the stability of the fixed point becomes difficult.
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