Searching for a dipole modulation in the large-scale structure of the Universe

@article{FernandezCobos2014SearchingFA,
  title={Searching for a dipole modulation in the large-scale structure of the Universe},
  author={R. Fern'andez-Cobos and Patricio Vielva and Davide Pietrobon and Amedeo Balbi and E. Mart'inez-Gonz'alez and Rita Bel{\'e}n Barreiro},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2014},
  volume={441},
  pages={2392-2397}
}
We acknowledge partial financial support from the Spanish Ministerio de Economia y Competitividad Projects HI2008-0129, AYA2010-21766-C03-01, AYA2012-39475-C02-01 and Consolider-Ingenio 2010 CSD2010-00064. RFC thanks financial support from Spanish CSIC for a JAE-predoc fellowship, cofinanced by the European Social Fund. 

Figures and Tables from this paper

Closing in on the large-scale CMB power asymmetry
Measurements of the cosmic microwave background (CMB) temperature anisotropies have revealed a dipolar asymmetry in power at the largest scales, in apparent contradiction with the statistical
Search for a direction in the forest of Lyman-α
We report the first test of isotropy of the Universe using the Lyman-α forest data from the high redshift quasars (z>2) (the signal from the matter dominated epoch) from SDSS-III BOSS-DR9 datasets.
Is there evidence for anomalous dipole anisotropy in the large-scale structure?
We probe the anisotropy of the large-scale structure (LSS) with the WISE-2MASS catalogue. This analysis is performed by a directional comparison of the galaxy number counts through the entire
Expected dipole asymmetry in CMB polarization
We explore the hemispherical asymmetry predicted in cosmic microwave background polarization when there is an asymmetry in temperature anisotropies due to primordial perturbations. We consider the
Probing cosmological isotropy with Planck Sunyaev–Zeldovich galaxy clusters
We probe the hypothesis of cosmological isotropy using the Planck Sunyaev-Zeldovich (PSZ) galaxy clusters data set. Our analyses consist on a hemispherical comparison of the clusters angular
Strongly scale-dependent CMB dipolar asymmetry from super-curvature fluctuations
We reconsider the observed CMB dipolar asymmetry in the context of open inflation, where a supercurvature mode might survive the bubble nucleation. If such a supercurvature mode modulates the
Dipolar modulation in number counts of WISE-2MASS sources
We test the statistical isotropy of the Universe by analysing the distribution of WISE extragalactic sources that were also observed by 2MASS. We pay particular attention to colour cuts and
The angular two-point correlation of NVSS galaxies revisited
We measure the angular two-point correlation and angular power spectrum from the NRAO VLA Sky Survey (NVSS) of radio galaxies. They are found to be consistent with the best-fit cosmological model
Dipole modulation of cosmic microwave background temperature and polarization
We propose a dipole modulation model for the Cosmic Microwave Background Radiation (CMBR) polarization field. We show that the model leads to correlations between l and l+1 multipoles, exactly as in
Statistical analyses of galaxy-surveys to probe the standard cosmological model
  • P. Vielva
  • Physics
    2014 IEEE International Conference on Image Processing (ICIP)
  • 2014
TLDR
The aim of this work is to stress the importance of some image processing and statistical approaches on this field, including multi-resolution, Bayesian inference and image filtering, to determine the galaxy redshift distribution, to constrain primordial non-Gaussianity, or to explore anisotropic models of the Universe.
...
...

References

SHOWING 1-10 OF 55 REFERENCES
The Pesky Power Asymmetry
Department of Physics and Astronomy, Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218(Dated: March 27, 2013)Physical models for the hemispherical power asymmetry in the cosmic
Correlation of CMB with large-scale structure. I. Integrated Sachs-Wolfe tomography and cosmological implications
We cross correlate large-scale structure (LSS) observations from a number of surveys with cosmic microwave background (CMB) anisotropies from the Wilkinson Microwave Anisotropy Probe (WMAP) to
Nonisotropy in the CMB power spectrum in single field inflation
Contaldi et al. [1] have suggested that an initial period of kinetic energy domination in single field inflation may explain the lack of CMB power at large angular scales. We note that in this
Is the low-l microwave background cosmic?
TLDR
It is shown that the quadrupole plane and the three octopole planes are far more aligned than previously thought (99.9% C.L.) with the direction of the cosmological dipole and with the equinoxes.
Uncorrelated universe: Statistical anisotropy and the vanishing angular correlation function in WMAP years 1 3
The large-angle (low-l) correlations of the cosmic microwave background (CMB) as reported by the Wilkinson Microwave Anisotropy Probe (WMAP) after their first year of observations exhibited
Imprints of a Primordial Preferred Direction on the Microwave Background
Rotational invariance is a well-established feature of low-energy physics. Violations of this symmetry must be extremely small today, but could have been larger in earlier epochs. In this paper we
Examination of evidence for a preferred axis in the cosmic radiation anisotropy.
TLDR
It is found that the amount of power concentrated in planar modes for l = 2,3 is not inconsistent with isotropy and Gaussianity, but the multipoles' alignment is indeed anomalous and extends up to l = 5 rejecting statistical isotropy with a probability in excess of 99.9%.
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 possible
Dipoles in the sky
We perform observational tests of statistical isotropy using data from large-scale-structure surveys spanning a wide range of wavelengths. Using data from Two Micron All Sky Survey (2MASS), 2MASS
Cosmic microwave background anomalies in an open universe.
TLDR
It is argued that the observed large-scale cosmic microwave anomalies, discovered by WMAP and confirmed by the Planck satellite, are most naturally explained in the context of a marginally open universe, and a specific implementation of the scenario which appears compatible with all existing constraints is provided.
...
...