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arXiv 0907.4930gr-qchep-th
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de Sitter上Lorentz规范的变换

Transforming to Lorentz Gauge on de Sitter

S. P. Miao, N. C. Tsamis, R. P. Woodard

摘要:

我们证明,某些规范固定泛函不能被添加到行动的背景下,如德西特在线性化不稳定。我们还构造了场相关的规范变换,该变换将电磁矢势从一个方便的非德西特不变量规范变换为德西特不变量的洛伦兹规范。变换后的传播子与以前在Lorentz规范中求解传播子方程得到的de Sitter不变量结果一致。这表明规范变换技术将消除规范条件引入的de Sitter不变性的非物理破坏。这表明,同样的技术可以用来最终解决自由引力子是否是德西特不变量的问题。

英文摘要:

We demonstrate that certain gauge fixing functionals cannot be added to the action on backgrounds such as de Sitter in which a linearization instability is present. We also construct the field dependent gauge transformation which carries the electromagnetic vector potential from a convenient, non-de Sitter invariant gauge to the de Sitter invariant, Lorentz gauge. The transformed propagator agrees with the de Sitter invariant result previously found by solving the propagator equation in Lorentz gauge. This shows that the gauge transformation technique will eliminate unphysical breaking of de Sitter invariance introduced by a gauge condition. It is suggested that the same technique can be used to finally resolve the issue of whether or not free gravitons are de Sitter invariant.

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