Nonstandard optics from quantum space-time

被引:827
作者
Gambini, R
Pullin, S
机构
[1] Fac Ciencias, Inst Fis, Montevideo, Uruguay
[2] Penn State Univ, Ctr Gravitat Phys & Geometry, Dept Phys, University Pk, PA 16802 USA
[3] Abdus Salaam Int Ctr Theoret Phys, Trieste, Italy
来源
PHYSICAL REVIEW D | 1999年 / 59卷 / 12期
关键词
D O I
10.1103/PhysRevD.59.124021
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We study light propagation in the picture of semiclassical space-time that emerges in canonical quantum gravity in the loop representation. In such a picture, where space-time exhibits a polymerlike structure at microscales, it is natural to expect departures from the perfect nondispersiveness of an ordinary vacuum. We evaluate these departures, computing the modifications to Maxwell's equations due to quantum gravity and showing that under certain circumstances nonvanishing corrections appear that depend on the helicity of propagating waves. These effects could lead to observable cosmological predictions of the discrete nature of quantum space-time. In particular, recent observations of nondispersiveness in the spectra of gamma-ray bursts at various energies could be used to constrain the type of semiclassical state that describes the universe. [S0556-2821(99)05612-X].
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页数:4
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