scholarly journals Model‐Independent Constraints on Reionization from Large‐Scale Cosmic Microwave Background Polarization

2008 ◽  
Vol 672 (2) ◽  
pp. 737-751 ◽  
Author(s):  
Michael J. Mortonson ◽  
Wayne Hu
2003 ◽  
Author(s):  
Ettore Carretti ◽  
Stefano Cortiglioni ◽  
Gianni Bernardi ◽  
Stefano Cecchini ◽  
Claudio Macculi ◽  
...  

2010 ◽  
Vol 2010 ◽  
pp. 1-25 ◽  
Author(s):  
L. Raul Abramo ◽  
Thiago S. Pereira

We review the basic hypotheses which motivate the statistical framework used to analyze the cosmic microwave background, and how that framework can be enlarged as we relax those hypotheses. In particular, we try to separate as much as possible the questions of gaussianity, homogeneity, and isotropy from each other. We focus both on isotropic estimators of nongaussianity as well as statistically anisotropic estimators of gaussianity, giving particular emphasis on their signatures and the enhanced “cosmic variances” that become increasingly important as our putative Universe becomes less symmetric. After reviewing the formalism behind some simple model-independent tests, we discuss how these tests can be applied to CMB data when searching for large-scale “anomalies”.


2009 ◽  
Vol 102 (13) ◽  
Author(s):  
C. Räth ◽  
G. E. Morfill ◽  
G. Rossmanith ◽  
A. J. Banday ◽  
K. M. Górski

2003 ◽  
Vol 584 (2) ◽  
pp. 599-607 ◽  
Author(s):  
Hiroshi Ohno ◽  
Masahiro Takada ◽  
Klaus Dolag ◽  
Matthias Bartelmann ◽  
Naoshi Sugiyama

1997 ◽  
Vol 06 (05) ◽  
pp. 535-544
Author(s):  
Petri Mähönen ◽  
Tetsuya Hara ◽  
Toivo Voll ◽  
Shigeru Miyoshi

We have studied the cosmic microwave background radiation by simulating the cosmic string network induced anisotropies on the sky. The large-angular size simulations are based on the Kaiser–Stebbins effect calculated from full cosmic-string network simulation. The small-angular size simulations are done by Monte-Carlo simulation of perturbations from a time-discretized toy model. We use these results to find the normalization of μ, the string mass per unit length, and compare this result with one needed for large-scale structure formation. We show that the cosmic string scenario is in good agreement with COBE, SK94, and MSAM94 microwave background radiation experiments with reasonable string network parameters. The predicted rms-temperature fluctuations for SK94 and MSAM94 experiments are Δ T/T=1.57×10-5 and Δ T/T=1.62×10-5, respectively, when the string mass density parameter is chosen to be Gμ=1.4×10-6. The possibility of detecting non-Gaussian signals using the present day experiments is also discussed.


2018 ◽  
Vol 618 ◽  
pp. C4 ◽  
Author(s):  
F. Vansyngel ◽  
F. Boulanger ◽  
T. Ghosh ◽  
B. Wandelt ◽  
J. Aumont ◽  
...  

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