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Anisotropic Cosmological Constant and the CMB Quadrupole Anomaly

Authors
  • Rodrigues, Davi C.
Type
Published Article
Publication Date
Jan 25, 2008
Submission Date
Aug 08, 2007
Identifiers
DOI: 10.1103/PhysRevD.77.023534
Source
arXiv
License
Unknown
External links

Abstract

There are evidences that the cosmic microwave background (CMB) large-angle anomalies imply a departure from statistical isotropy and hence from the standard cosmological model. We propose a LCDM model extension whose dark energy component preserves its nondynamical character but wield anisotropic vacuum pressure. Exact solutions for the cosmological scale factors are presented, upper bounds for the deformation parameter are evaluated and its value is estimated considering the elliptical universe proposal to solve the quadrupole anomaly. This model can be constructed from a Bianchi I cosmology with cosmological constant from two different ways: i) a straightforward anisotropic modification of the vacuum pressure consistently with energy-momentum conservation; ii) a Poisson structure deformation between canonical momenta such that the dynamics remain invariant under scale factors rescalings.

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