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Ellipsoidal Universe Can Solve The CMB Quadrupole Problem
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The recent three-year WMAP data have confirmed the anomaly concerning the low quadrupole amplitude compared to the best-fit \Lambda CDM prediction. We show that, allowing the large-scale spatial geometry of our universe to be plane-symmetric with eccentricity at decoupling or order 10^{-2}, the quadrupole amplitude can be drastically reduced without affecting higher multipoles of the angular power spectrum of the temperature anisotropy.
Forward citations
Cited by 3 Pith papers
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A Quantitative Framework for Testing the Hubble Tension in a Bianchi Type I Cosmological Background
An analytic weak-shear Bianchi I calculation bounds the low-redshift luminosity-distance quadrupole to |Aμ(0.15)|≲2.4×10^-11 mag under BBN shear limits, ruling out shear-only resolution of the Hubble tension.
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Polymer Bianchi-I with polymer matter
In a Bianchi-I universe with polymer quantization of both geometry and a massless scalar, the matter polymer scale shifts the quantum bounce and alters volume and anisotropy evolution.
- Testing $\gamma\delta$CDM Model in the Redshift Bins
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