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- W3100012734 abstract "Search for the statistical anisotropy in the CMB data is a powerful tool for constraining models of the early Universe. In this paper we focus on the recently proposed cosmological scenario with conformal rolling. We consider two sub-scenarios, one of which involves a long intermediate stage between conformal rolling and conventional hot epoch. Primordial scalar perturbations generated within these sub-scenarios have different direction-dependent power spectra, both characterized by a single parameter h2. We search for the signatures of this anisotropy in the seven-year WMAP data using quadratic maximum likelihood method, first applied for similar purposes by Hanson and Lewis. We confirm the large quadrupole anisotropy detected in V and W bands, which has been argued to originate from systematic effects rather than from cosmology. We construct an estimator for the parameter h2. In the case of the sub-scenario with the intermediate stage we set an upper limit h2 < 0.045 at the 95% confidence level. The constraint on h2 is much weaker in the case of another sub-scenario, where the intermediate stage is absent." @default.
- W3100012734 created "2020-11-23" @default.
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- W3100012734 date "2012-05-28" @default.
- W3100012734 modified "2023-10-03" @default.
- W3100012734 title "Statistical anisotropy of CMB as a probe of conformal rolling scenario" @default.
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- W3100012734 doi "https://doi.org/10.1088/1475-7516/2012/05/033" @default.
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