2005/12/16 by T. R. Jaffe, Sigbjørn Hervik, S. Hervik +3 · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #astro-ph
paper · pdf · doi:10.1086/503893
published as Astrophys.J.644:701-708,2006 · submitted to ApJ
arxiv created 2005/12/16 · openalex publication_date 2006/06/19 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31
We generalize the predictions for the cosmic microwave background (CMB) anisotropy patterns arising in Bianchi type VII h universes to include a dark energy component. We consider these models in light of the result of Jaffe and collaborators in which a correlation was found on large angular scales between the WMAP data and the anisotropy structure in a low-density Bianchi universe. We find that by including a term Ω Λ > 0, the same best-fit anisotropy pattern is reproduced by several combinations of cosmological parameters. This subset of models can then be further constrained by current observations that limit the values of various cosmological parameters. In particular, we consider the so-called geometric degeneracy in these parameters imposed by the peak structure of the WMAP data themselves. Apparently, despite the additional freedom allowed by the dark energy component, the modified Bianchi models are ruled out at high significance.