Non-linear Data Analysis on the Sphere

Beschreibung

This work deals with the search for signatures of non-Gaussianities in the cosmic microwave background (CMB). Probing Gaussianity in the CMB addresses one of the key questions in modern cosmology because it allows us to discriminate between different models of inflation, and thus concerns a fundamental part of the standard cosmological model.
    The basic goal here is to adapt complementary methods stemming from the field of complexity science to CMB data analysis. Two key concepts, namely the method of surrogates and estimators for local scaling properties, are applied to CMB data analysis.
    All results show strong non-Gaussianities and pronounced asymmetries. The consistency of the full sky and cut sky results shows convincingly for the first time that the influence of the Galactic plane is not responsible for these deviations from Gaussianity and isotropy. The findings seriously call into question predictions of isotropic cosmologies based on the widely accepted single field slow roll inflation model.

This work deals with the search for signatures of non-Gaussianities in the cosmic microwave background (CMB). Probing Gaussianity in the CMB addresses one of the key questions in modern cosmology because it allows us to discriminate between different models of inflation, and thus concerns a fundamental part of the standard cosmological model.
    The basic goal here is to adapt complementary methods stemming from the field of complexity science to CMB data analysis. Two key concepts, namely the method of surrogates and estimators for local scaling properties, are applied to CMB data analysis.
    All results show strong non-Gaussianities and pronounced asymmetries. The consistency of the full sky and cut sky results shows convincingly for the first time that the influence of the Galactic plane is not responsible for these deviations from Gaussianity and isotropy. The findings seriously call into question predictions of isotropic cosmologies based on the widely accepted single field slow roll inflation model.

Nominated as an outstanding Ph.D. thesis by the Max Planck Institute for Extraterrestrial Physics Parts of the work have been published in prestigious scientific journals (Physical Review Letters, Monthly Notices of the Royal Astronomical Society, Advances in Astronomy, Physical Review D) The work has been presented at several international conferences and workshops Includes supplementary material: sn.pub/extras

Autor*in

Gregor Rossmanith

Themen in »Non-linear Data Analysis on the Sphere«

Analysis of Spherical Datasets Analysis of WMAP Data CMB Data Analysis CMB non-Gaussianity Method of Surrogates Probing Gaussianity in the CMB Scaling Index Method Scaling Index Statistics Testing models of inflation WMAP Satellite

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