Quantum gravity at two loops
Quantum gravity at two loops
复制标题
两个环路的量子引力
DOI：
10.1016/0370-2693(85)91470-4
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发表时间：
1985
影响因子：
4.4
通讯作者：
A. Sagnotti
中科院分区：
文献类型：
--
作者：
M. H. Goroff;A. Sagnotti
从量子场论的早期开始，紫外线发散就一直困扰着它。量子电动力学是第一个被详细研究的理论，它很快就被认为具有发散的微扰展开。尽管如此，在这种情况下，膨胀是可重正化的，因此是可预测的，只要我们把时空的维度限制在最多4。这种分歧可以被吸收到只有两个参数的定义中，即电子质量和电子电荷，它们的值可以从实验中提取。对无限重正化的需要显然还有很多需要改进的地方，而且长期以来许多物理学家认为这至多是一种临时的补救办法。尽管如此，可重正化性是基于杨-米尔斯模型构建的主要原则之一
Ultraviolet divergences have plagued quantum field theory since its early days. Quantum electrodynamics, the first theory to be studied in detail, was promptly recognized to have a divergent perturbation expansion. Nonetheless, the expansion is in this case renorrnahzable, and thus predictive, provided one restricts the dimensionality of space-time to be at most four. The divergences can be absorbed into the definitions of only two parameters, the electron mass and the electron charge, whose values can be extracted from experiment. The need for infinite renormalizations clearly leaves much to be desired, and has long been regarded by many physicists as at most a temporary remedy. Nonetheless, renormalizability is one of the main principles that underlie the construction of models based on Yang-Mills