宇宙学红移中宇称破坏的界限
Bounds on Parity Violation In the Cosmological Redshift
摘要：
引力中的宇称（P）破坏将是新物理学的一个可靠标志。我们研究了宇宙学红移中P破坏的可能性。如果右旋和左旋圆偏振的光子经历不同的红移，那么来自遥远光源的辐射将趋于去偏振，因为偏振态在传播过程中会积累不同的相位。由此产生的双折射有一个不寻常的特征--取决于z^2--与其他理论中所看到的完全不同，包括那些违反局部增强不变性的理论。观测到的$γ$射线暴的宽谱偏振将左右手红移之间的分数差限制在6 × 10^（-37）水平。
英文摘要：
Parity (P) violation in gravity would be a sure sign of new physics. We examine the possibility of P violation in the cosmological redshift. If right- and left-circularly polarized photons experience the redshift differently, the radiation from distant sources would tend to be depolarized, since the polarizations states would accumulate different phases during propagation. The resulting birefringence has an unusual signature--depending on z^2--quite unlike what is seen in other theories, including those with violation of local boost invariance. The observed broad-spectrum polarization of $γ$-ray bursts constrains the fractional difference between the right- and left-handed redshifts at the 6 x 10^(-37) level.
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