### Abstract

We search a sample of photometric luminous red galaxies (LRGs) measured by the Sloan Digital Sky Survey (SDSS) for a quadrupolar anisotropy in the primordial power spectrum, in which P() is an isotropic power spectrum (k) multiplied by a quadrupolar modulation pattern. We first place limits on the 5 coefficients of a general quadrupole anisotropy. We also consider axisymmetric quadrupoles of the form P() = (k)1+g_{*}[()^{2}-(1/3)] where is the axis of the anisotropy. When we force the symmetry axis to be in the direction (l,b) = (94°,26°) identified in the recent Groeneboom et al. analysis of the cosmic microwave background, we find g_{*} = 0.0060.036 (1σ). With uniform priors on and g_{*} we find that -0.41 < g_{*} < +0.38 with 95% probability, with the wide range due mainly to the large uncertainty of asymmetries aligned with the Galactic Plane. In none of these three analyses do we detect evidence for quadrupolar power anisotropy in large scale structure.

Original language | English (US) |
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Article number | 027 |

Journal | Journal of Cosmology and Astroparticle Physics |

Volume | 2010 |

Issue number | 5 |

DOIs | |

State | Published - 2010 |

### Keywords

- Galaxy surveys
- Power spectrum

### ASJC Scopus subject areas

- Astronomy and Astrophysics

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## Cite this

*Journal of Cosmology and Astroparticle Physics*,

*2010*(5), [027]. https://doi.org/10.1088/1475-7516/2010/05/027