Comment on the Measurement of Cosmological Birefringence
Astrophysics
2008-02-03 v2
Abstract
Nodland and Ralston (astro-ph/9704196) claim evidence for a wavelength-independent cosmic birefringence. Although it has been shown (astro-ph/9704247, astro-ph/9704263) that the data analysed did not support this conclusion, the possibility of such an effect remains interesting. Here I present a much more accurate test using high-resolution radio images of distant radio galaxies and quasars. A preliminary application sets an upper limit about thirty times lower than the original claim.
Cite
@article{arxiv.astro-ph/9704285,
title = {Comment on the Measurement of Cosmological Birefringence},
author = {J. P. Leahy},
journal= {arXiv preprint arXiv:astro-ph/9704285},
year = {2008}
}
Comments
Comment on astro-ph/9704196. 3 pages, RevTeX, 1 ps figure included. 1st page is comment submitted to PRL, revised in light of astro-ph/9706126 and PRL length limit; a 2 page reply to astro-ph/9706126 is appended