Nonrenormalizability of the classical statistical approximation

Nonrenormalizability of the classical statistical approximation
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经典统计近似的不可重整性

DOI:
10.1103/physrevd.90.065029
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发表时间:
2014
期刊:
影响因子:
5
通讯作者:
Bin Wu
Bin Wu
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
T. Epelbaum;F. Gelis;Bin Wu

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在本文中,我们讨论的经典统计近似,最近已被用于在量子场论的平衡问题的几个研究的近似方案的重正化有关的问题。虽然这种近似方案中的紫外光功率计数与未近似的量子场论中的相同,但这种近似是不可重整化的。这种不可重正化性的主要原因是温伯格定理在这种近似下的失效。我们还讨论了一些实际的影响,采用这种近似方案的模拟,这个负面的结果,我们推测可能修改的经典统计近似,以系统地减去领先的残差分歧。
In this paper, we discuss questions related to the renormalizability of the classical statistical approximation, an approximation scheme that has been used recently in several studies of out-of-equilibrium problems in Quantum Field Theory. Although the ultraviolet power counting in this approximation scheme is identical to that of the unapproximated quantum field theory, this approximation is not renormalizable. The leading cause of this non-renormalizability is the breakdown of Weinberg's theorem in this approximation. We also discuss some practical implications of this negative result for simulations that employ this approximation scheme, and we speculate about a possible modification of the classical statistical approximation in order to systematically subtract the leading residual divergences.
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