Do Cosmological Perturbations Have Zero Mean

@article{ArmendarizPicon2011DoCP,
  title={Do Cosmological Perturbations Have Zero Mean},
  author={Cristian Armendariz-Picon},
  journal={Journal of Cosmology and Astroparticle Physics},
  year={2011},
  volume={2011},
  pages={048-048}
}
  • C. Armendariz-Picon
  • Published 13 December 2010
  • Physics
  • Journal of Cosmology and Astroparticle Physics
A central assumption in our analysis of cosmic structure is that cosmological perturbations have a constant ensemble mean, which can be set to zero by appropriate choice of the background. This property is one of the consequences of statistical homogeneity, the invariance of correlation functions under spatial translations. In this article we explore whether cosmological perturbations indeed have zero mean, and thus test one aspect of statistical homogeneity. We carry out a classical test of… Expand
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References

SHOWING 1-10 OF 31 REFERENCES
Cosmic microwave background anisotropy power spectrum statistics for high precision cosmology
As the era of high precision cosmology approaches, the empirically determined power spectrum of the microwave background anisotropy $C_l$ will provide a crucial test for cosmological theories. WeExpand
Testing gaussianity, homogeneity and isotropy with the cosmic microwave background
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. InExpand
Significance of the largest scale CMB fluctuations in WMAP
We investigate anomalies reported in the Cosmic Microwave Background maps from the Wilkinson Microwave Anisotropy Probe (WMAP) satellite on very large angular scales and discuss possibleExpand
Testing isotropy of cosmic microwave background radiation
We introduce new symmetry-based methods to test for isotropy in cosmic microwave background radiation. Each angular multipole is factored into unique products of power eigenvectors, relatedExpand
Footprints of statistical anisotropies
We propose and develop a formalism to describe and constrain statistically anisotropic primordial perturbations. Starting from a decomposition of the primordial power spectrum in spherical harmonics,Expand
FIVE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE * OBSERVATIONS: COSMOLOGICAL INTERPRETATION
The Wilkinson Microwave Anisotropy Probe (WMAP) 5-year data provide stringent limits on deviations from the minimal, six-parameter Λ cold dark matter model. We report these limits and use them toExpand
Erratum: "Asymmetries in the Cosmic Microwave Background Anisotropy Field" (ApJ, 605, 14 [2004])
We report on the results from two independent but complementary statistical analyses of the Wilkinson Microwave Anisotropy Probe (WMAP) first-year data, based on the power spectrum and N-pointExpand
Measuring Statistical Isotropy of CMB Anisotropy
The statistical expectation values of the temperature fluctuations of cosmic microwave background (CMB) are assumed to be preserved under rotations of the sky. This assumption of {\em statisticalExpand
Cosmological Perturbation Theory in the Synchronous and Conformal Newtonian Gauges
This paper presents a systematic treatment of the linear theory of scalar gravitational perturbations in the synchronous gauge and the conformal Newtonian (or longitudinal) gauge. It differs fromExpand
A hemispherical power asymmetry from inflation
Measurements of cosmic microwave background temperature fluctuations by the Wilkinson Microwave Anisotropy Probe indicate that the fluctuation amplitude in one half of the sky differs from theExpand
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