Indication of Anisotropy in Electromagnetic Propagation over Cosmological Distances
Abstract
We report a systematic rotation of the plane of polarization of electromagnetic radiation propagating over cosmological distances. The effect is extracted independently from Faraday rotation, and found to be correlated with the angular positions and distances to the sources. Monte Carlo analysis yields probabilistic P values of order 10^{3} for this to occur as a fluctuation. A fit yields a birefringence scale of order 10^{25}h_{0}h m. Dependence on redshift z rules out a local effect. Barring hidden systematic bias in the data, the correlation indicates a new cosmological effect.
 Publication:

Physical Review Letters
 Pub Date:
 April 1997
 DOI:
 10.1103/PhysRevLett.78.3043
 arXiv:
 arXiv:astroph/9704196
 Bibcode:
 1997PhRvL..78.3043N
 Keywords:

 Astrophysics;
 High Energy Physics  Phenomenology
 EPrint:
 5 pages, 1 figure, ReVTeX. For more information, see http://www.cc.rochester.edu/college/rtc/Borge/aniso.html