Anisotropic Cosmological Constant and the CMB Quadrupole Anomaly

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dc.creatorRodrigues, Davi C.
dc.date2007-08-08
dc.date2008-01-25
dc.date.accessioned2026-07-07T11:18:34Z
dc.date.available2026-07-07T11:18:34Z
dc.descriptionThere 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.
dc.description8 pages, 2 columns, 1 figure. v2: figure improved, added comments on higher eccentricity powers and references. v3: typos corrected, version to appear in PRD
dc.identifierhttps://arxiv.org/abs/0708.1168
dc.identifierhttp://arxiv.org/abs/0708.1168
dc.identifierPhys.Rev.D77:023534,2008
dc.identifierdoi:10.1103/PhysRevD.77.023534
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/193384
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titleAnisotropic Cosmological Constant and the CMB Quadrupole Anomaly
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