Anisotropic cosmological constant and the CMB quadrupole anomaly

Journal Article · Tue Jan 15 04:00:00 EST 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.77.023534· OSTI ID:21035822

Rodrigues, Davi C ^[1]

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1. Departamento de Fisica, Universidad de Santiago de Chile, Casilla 307, Santiago (Chile)

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 {lambda}CDM model extension whose dark energy component preserves its nondynamical character but wields 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 a 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.

• OSTI ID: 21035822
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 2 Vol. 77; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANISOTROPY
COSMOLOGICAL CONSTANT
COSMOLOGICAL MODELS
COSMOLOGY
DEFORMATION
EXACT SOLUTIONS
ISOTROPY
NONLUMINOUS MATTER
QUADRUPOLES
RELICT RADIATION
UNIVERSE