arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.13100hep-th
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UV相互作用标量场理论的精确FRG流的存在性和构造

Existence and Construction of Exact FRG Flows of a UV-Interacting Scalar Field Theory

Jobst Ziebell

摘要:

我们证明了在满足紫外极限下的大质量相互作用实标量$ϕ^4$理论和红外极限下的广义自由理论的朴素边界条件下,$d > 2$维Wetterich方程的欧氏不变精确解的存在性,并给出了其构造过程.该构造基于四点函数的自洽近似,通过迭代方法产生所有阶的动量相关关联函数。由此产生的放大器是有界的,在所有的监管规模,我们确定明确的界限捕捉在紫外线和红外限制的渐近。此外,给出的构造原理可以推广到其他系统,并可能成为有用的精确解的一般性质的研究。

英文摘要:

We prove the existence and give a construction procedure of Euclidean-invariant exact solutions to the Wetterich equation in $d > 2$ dimensions satisfying the naive boundary condition of a massive and interacting real scalar $ϕ^4$ theory in the ultraviolet limit as well as a generalised free theory in the infrared limit. The construction produces the momentum-dependent correlation functions to all orders through an iterative scheme, based on a self-consistent ansatz for the four-point function. The resulting correlators are bounded at all regulator scales and we determine explicit bounds capturing the asymptotics in the UV and IR limits. Furthermore, the given construction principle may be extended to other systems and might become useful in the study of general properties of exact solutions.

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