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arXiv 0910.5202hep-th
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变α电动力学中辐射感生Lorentz和规范对称性破坏

Radiatively Induced Lorentz and Gauge Symmetry Violation in Electrodynamics with Varying alpha

Alejandro Ferrero, Brett Altschul

摘要:

随时间变化的精细结构常数α(t)可以引起真空偏振的洛伦兹和CPT破坏变化,这将影响光子传播。这种对有效作用量的改变可能违反规范不变性,但在其他情况下是允许的。然而,在变化α的最小理论中,在最低阶没有产生这样的项。在二阶时,真空极化可以产生不稳定性--负光子质量平方-m^2与α [(d α/dt)/α]^2 log(λ ^2)成正比的洛伦兹破坏模拟,其中λ是低能有效理论的截止值。

英文摘要:

A time-varying fine structure constant alpha(t) could give rise to Lorentz- and CPT-violating changes to the vacuum polarization, which would affect photon propagation. Such changes to the effective action can violate gauge invariance, but they are otherwise permitted. However, in the minimal theory of varying alpha, no such terms are generated at lowest order. At second order, vacuum polarization can generate an instability--a Lorentz-violating analogue of a negative photon mass squared -m^2 proportional to alpha [(d alpha/dt) / alpha]^2 log (Lambda^2), where Lambda is the cutoff for the low-energy effective theory.

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