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arXiv 0704.3429gr-qc
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光在量子弯曲时空中的传播及反反应效应

Light Propagation on Quantum Curved Spacetime and Back reaction effects

Carlos Kozameh, Florencia Parisi

摘要:

研究了圈量子引力半经典近似下任意量子弯曲背景下的电磁场方程。得到了Maxwell场和引力场的有效相互作用哈密顿量,并导出了相应的场方程,它可以表示为Maxwell势的修正波动方程。我们利用这些结果分析了电磁波在量子Robertson-Walker时空中的传播,并证明了洛伦兹不变性是不保持的。开发的形式主义可以应用到的情况下,由于电磁场的度量上的反作用的影响被考虑在内,导致非协变场方程。

英文摘要:

We study the electromagnetic field equations on an arbitrary quantum curved background in the semiclassical approximation of Loop Quantum Gravity. The effective interaction hamiltonian for the Maxwell and gravitational fields is obtained and the corresponding field equations, which can be expressed as a modified wave equation for the Maxwell potential, are derived. We use these results to analyze electromagnetic wave propagation on a quantum Robertson-Walker space time and show that Lorentz Invariance is not preserved. The formalism developed can be applied to the case where back reaction effects on the metric due to the electromagnetic field are taken into account, leading to non covariant field equations.

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