2015/12/31 by Sankha Subhra Chakrabarty · 1 citation
Physics and Astronomy · #Anisotropy #Astrophysics #Classical mechanics #Cosmology #Cosmology and Gravitation Theories #Dipole #Friedmann–Lemaître–Robertson–Walker metric #Galaxies: Formation, Evolution, Phenomena #Galaxy #Physics #Polarization (electrochemistry) #Quantum mechanics #Radio Astronomy Observations and Technology #Radio galaxy #astro-ph.CO #astro-ph.GA
paper · pdf · doi:10.1103/physrevd.93.123507
published as Phys. Rev. D 93, 123507 (2016) · 22 pages, 6 figures, references updated
arxiv created 2016/05/19 · openalex publication_date 2016/06/06 · arxiv updated 2016/06/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Analysis of the correlation between the angular positions of distant radio galaxies on the sky and the orientations of their polarization vectors with respect to their major axes indicates a dipolar anisotropy in the large scale. We consider a single mode of large-scale scalar perturbation to the FRW metric. Using Newman-Penrose formalism, we calculate the rotation of the galaxy major axis with respect to the polarization vector as the elliptic image and the polarization vector are carried through the perturbed spacetime. The dependence of the rotation on the polar angular coordinate of the galaxy is qualitatively similar to the claimed dipole pattern.