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arXiv 0710.2840hep-th
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有效Action、共形Anomaly与二次发散问题

Effective Action, Conformal Anomaly and the Issue of Quadratic Divergences

Krzysztof A. Meissner, Hermann Nicolai

摘要:

对于无质量的$ϕ^4$理论,我们明确地计算最低阶非局部贡献的一个回路的有效行动所需的确定的痕迹异常。施加精确的共形不变性的有效作用的局部部分,我们认为,二次发散的问题不会出现在一个理论中,精确的共形对称性只被打破的量子效应。因此,共形对称可以取代低能超对称,作为稳定弱标度和解决等级问题的可能指导,如果(i)在弱标度和普朗克标度之间没有中间标度,(ii)运行耦合在整个能量范围内既不表现出朗道极点也不表现出不稳定性。

英文摘要:

For massless $ϕ^4$ theory, we explicitly compute the lowest order non-local contributions to the one-loop effective action required for the determination of the trace anomaly. Imposing exact conformal invariance of the local part of the effective action, we argue that the issue of quadratic divergences does not arise in a theory where exact conformal symmetry is only broken by quantum effects. Conformal symmetry can thus replace low energy supersymmetry as a possible guide towards stabilizing the weak scale and solving the hierarchy problem, if (i) there are no intermediate scales between the weak scale and the Planck scale, and (ii) the running couplings exhibit neither Landau poles nor instabilities over this whole range of energies.

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