arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1807.05964hep-thgr-qc
收藏

de Sitter空间中$O(N)$ -模型关联函数的长距离行为及久期项的重定

Long distance behavior of $O(N)$-model correlators in de Sitter space and the resummation of secular terms

Diana López Nacir, Francisco D. Mazzitelli, Leonardo G. Trombetta

摘要:

我们分析了de Sitter时空中相互作用标量$O(N)$模型的两点函数的长距离行为。根据我们以前的工作,这种行为进行了分析的解析延续的欧几里德关联函数,这是计算通过处理齐次零模式,并使用零和非零模式之间的相互作用的部分remanation。我们专注于无质量的领域,并提出了一种替代的推导我们的方法,其中涉及到一个双重展开的$1/N$和耦合常数的理论。这个推导比前一个简单,并且可以直接推广到负平方质量的场。我们扩展了我们以前的结果,通过计算的两点函数的长波长极限在下一个到领先的顺序在$1/N$和领先的顺序在耦合常数,这涉及到进一步remmation的费曼图(需要时,两点函数分析连续)。我们证明了,在这个额外的再确认后,两点函数消失在长距离极限。

英文摘要:

We analyze the long distance behavior of the two-point functions for an interacting scalar $O(N)$ model in de Sitter spacetime. Following our previous work, this behavior is analyzed by analytic continuation of the Euclidean correlators, which are computed by treating the homogeneous zero mode exactly and using a partial resummation of the interactions between the zero and the non-zero modes. We focus on massless fields and present an alternative derivation of our method, which involves a double expansion in $1/N$ and the coupling constant of the theory. This derivation is simpler than the previous one and can be directly extended for fields with negative squared-mass. We extend our previous results by computing the long wavelength limit of the two-point functions at next-to-leading order in $1/N$ and at leading order in the coupling constant, which involves a further resummation of Feynman diagrams (needed when the two-point functions are analitically continued). We prove that, after this extra resummation, the two-point functions vanish in the long distance limit.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑