# 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} }

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

#### Figures and Tables from this paper

#### 6 Citations

Limits on semiclassical fluctuations in the primordial universe

- Physics
- 2013

We place limits on semiclassical fluctuations that might be present in the primordial perturbation spectrum. These can arise if some signatures of pre-inflationary features survive the expansion, or… Expand

Detecting anomalies in CMB maps: a new method

- Physics
- 2015

Ever since WMAP announced its first results, different analyses have shown that there is weak evidence for several large-scale anomalies in the CMB data. While the evidence for each anomaly appears… Expand

Quantum Origin of the Primordial Fluctuation Spectrum and its Statistics

- Physics
- 2013

Fil: Landau, Susana Judith. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Instituto de Fisica de Buenos Aires; Argentina;

The Additional Side Force on the Force Transducer in the Combinatorial Load Cell

- Engineering
- 2014

By the reason of the additional side force acting on the force transducers affecting the rotation effect of the combinatorial load cell,the paper describes the effect of the spherical plain thrust… Expand

Improved, two-stage protein expression and purification via autoinduction of both autolysis and auto DNA/RNA hydrolysis conferred by phage lysozyme and DNA/RNA endonuclease.

- Medicine, Chemistry
- Biotechnology and bioengineering
- 2020

Improved release of recombinant proteins in E. coli is reported by the tightly controlled autoinduction of both phage lysozyme and the non specific DNA/RNA endonuclease from S. marcescens, which enables robust growth and resistance to lysis in routine media when cells are propagated. Expand

#### References

SHOWING 1-10 OF 31 REFERENCES

Cosmic microwave background anisotropy power spectrum statistics for high precision cosmology

- Physics
- 2001

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. We… Expand

Testing gaussianity, homogeneity and isotropy with the cosmic microwave background

- Physics
- 2010

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… Expand

Significance of the largest scale CMB fluctuations in WMAP

- Physics
- 2004

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 possible… Expand

Testing isotropy of cosmic microwave background radiation

- Physics
- 2008

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, related… Expand

Footprints of statistical anisotropies

- Physics
- 2006

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

- Physics
- 2008

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 to… Expand

Erratum: "Asymmetries in the Cosmic Microwave Background Anisotropy Field" (ApJ, 605, 14 [2004])

- Physics
- 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-point… Expand

Measuring Statistical Isotropy of CMB Anisotropy

- Physics
- 2003

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 statistical… Expand

Cosmological Perturbation Theory in the Synchronous and Conformal Newtonian Gauges

- Physics
- 1995

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 from… Expand

A hemispherical power asymmetry from inflation

- Physics
- 2008

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 the… Expand