Joint analysis of CMB temperature and lensing-reconstruction power spectra
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In this article, the correlation between the disconnected noise bias in the trispectrum measurement and sample variance in the temperature power spectrum was investigated, along with the sample variance of the lenses themselves.Abstract:
Gravitational lensing provides a significant source of cosmological information in modern CMB parameter analyses. It is measured in both the power spectrum and trispectrum of the temperature fluctuations. These observables are often treated as independent, although as they are both determined from the same map this is impossible. In this paper, we perform a rigorous analysis of the covariance between lensing power spectrum and trispectrum analyses. We find two dominant contributions coming from: (i) correlations between the disconnected noise bias in the trispectrum measurement and sample variance in the temperature power spectrum; and (ii) sample variance of the lenses themselves. The former is naturally removed when the dominant N0 Gaussian bias in the reconstructed deflection spectrum is dealt with via a partially data-dependent correction, as advocated elsewhere for other reasons. The remaining lens-cosmic-variance contribution is easily modeled but can safely be ignored for a Planck-like experiment, justifying treating the two observable spectra as independent. We also test simple likelihood approximations for the deflection power spectrum, finding that a Gaussian with a parameter-independent covariance performs well.read more
Citations
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Phases of New Physics in the CMB
TL;DR: In this article, the authors revisited the phase shift of the CMB anisotropy spectrum as a probe of new physics and provided observational constraints from the Planck temperature and polarization data on additional forms of radiation.
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Constraints on Cosmological Parameters from the Angular Power Spectrum of a Combined 2500 deg$^2$ SPT-SZ and Planck Gravitational Lensing Map
G. Simard,Y. Omori,Y. Omori,K. Aylor,Eric J. Baxter,Eric J. Baxter,Bradford Benson,Bradford Benson,Lindsey Bleem,John E. Carlstrom,C. L. Chang,C. L. Chang,H-M. Cho,R. Chown,T. M. Crawford,A. T. Crites,A. T. Crites,T. de Haan,T. de Haan,Matt Dobbs,Matt Dobbs,W. B. Everett,Elizabeth George,Elizabeth George,N. W. Halverson,N. L. Harrington,Jason W. Henning,Gilbert Holder,Zhen Hou,W. L. Holzapfel,J. D. Hrubes,Lloyd Knox,Adrian T. Lee,Adrian T. Lee,E. M. Leitch,Daniel M. Luong-Van,A. Manzotti,Jeff McMahon,S. S. Meyer,L. M. Mocanu,Joseph J. Mohr,Joseph J. Mohr,T. Natoli,T. Natoli,Stephen Padin,C. Pryke,Christian L. Reichardt,Christian L. Reichardt,J. E. Ruhl,J. T. Sayre,J. T. Sayre,K. K. Schaffer,K. K. Schaffer,Erik Shirokoff,Erik Shirokoff,Z. K. Staniszewski,Z. K. Staniszewski,Antony A. Stark,K. T. Story,K. Vanderlinde,Joaquin Vieira,R. Williamson,W. L. K. Wu +62 more
TL;DR: In this article, the angular power spectrum of a CMB gravitational lensing potential map created using temperature data from 2500 deg$^2$ of South Pole Telescope (SPT) data supplemented with data from Planck in the same sky region, with the statistical power in the combined map primarily from the SPT data.
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Minimizing gravitational lensing contributions to the primordial bispectrum covariance
William R. Coulton,P. Daniel Meerburg,David G. Baker,Selim C. Hotinli,Adriaan J. Duivenvoorden,Alexander van Engelen +5 more
TL;DR: In this article, the effect of non-Gaussian covariance on the bispectrum covariance of the CMB sky was analyzed analytically for the first time for both temperature and polarization.
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Likelihood methods for CMB experiments
Martina Gerbino,Martina Gerbino,Massimiliano Lattanzi,M. Migliaccio,M. Migliaccio,L. Pagano,L. Pagano,L. Salvati,L. Salvati,L. P. L. Colombo,Alessandro Gruppuso,Alessandro Gruppuso,Paolo Natoli,Paolo Natoli,Gianluca Polenta +14 more
TL;DR: In this article, a review of likelihood approaches targeted to the analysis of the CMB signal at different scales, and to the estimation of key cosmological parameters is presented, highlighting the most relevant aspects of each approach and comparing their performances.
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Non-Gaussian structure of B-mode polarization after delensing
TL;DR: In this paper, the power spectrum correlation matrix and the probability distribution function of the B-mode power spectrum amplitude were investigated under the assumption of non-Gaussian B-modes and quadratic delensing.
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