Significance of the largest scale CMB fluctuations in WMAP
@article{OliveiraCosta2004SignificanceOT, title={Significance of the largest scale CMB fluctuations in WMAP}, author={Angelica de Oliveira-Costa and Max Tegmark and Matias Zaldarriaga and Andrew J. S. Hamilton}, journal={Physical Review D}, year={2004}, volume={69}, pages={063516} }
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 interpretations. Three independent anomalies involve the quadrupole and octopole:
1. The cosmic quadrupole on its own is anomalous at the 1-in-20 level by being low (the cut-sky quadrupole measured by the WMAP team is more strikingly low, apparently due to a coincidence in the orientation of our Galaxy of no…
479 Citations
COSMOLOGICAL IMPLICATIONS OF THE CMB LARGE-SCALE STRUCTURE
- Physics
- 2012
The Wilkinson Microwave Anisotropy Probe (WMAP) and Planck may have uncovered several anomalies in the full cosmic microwave background (CMB) sky that could indicate possible new physics driving the…
Cosmic Microwave Background large-scale directional anomalies as seen by Planck and WMAP
- Physics
- 2017
It has been found that large-scale anisotropies in the Cosmic Microwave Background are anomalous with respect to the predictions of the standard model of cosmology. We focused on the low multipole…
Can a primordial magnetic field originate large-scale anomalies in WMAP data?
- Physics, Geology
- 2008
Several accurate analyses of the cosmic microwave background (CMB) temperature maps from the Wilkinson Microwave Anisotropy Probe (WMAP) have revealed a set of anomalous results, at large angular…
On the cosmic microwave background large-scale angular correlations
- Physics
- 2006
Aims. We study the large-scale angular correlation signatures of the cosmic microwave background (CMB) temperature fluctuations from WMAP data in several spherical cap regions of the celestial…
The cosmic microwave background quadrupole in a polarized light
- Physics
- 2004
The low quadrupole of the cosmic microwave background (CMB), measured by the Cosmic Background Explorer (COBE) and confirmed by the Wilkinson Microwave Anisotropy Probe (WMAP), has generated much…
The actual Rees-Sciama effect from the local universe
- Physics
- 2007
Observations of the Cosmic Microwave Background (CMB) have revealed an unexpected quadrupole-octopole alignment along a preferred axis pointing toward the Virgo cluster. We here investigate whether…
Evidence of Vorticity and Shear at Large Angular Scales in the WMAP Data: A Violation of Cosmological Isotropy?
- Physics
- 2005
Motivated by the large-scale asymmetry observed in the cosmic microwave background sky, we consider a specific class of anisotropic cosmological models—Bianchi type VIIh—and compare them to the WMAP…
A low cosmic microwave background variance in the Wilkinson Microwave Anisotropy Probe data
- Physics
- 2008
We have estimated the cosmic microwave background (CMB) variance from the three-year Wilkinson Microwave Anisotropy Probe (WMAP) data, finding a value which is significantly lower than the one…
Can residuals of the solar system foreground explain low multipole anomalies of the CMB
- Physics, Geology
- 2012
The low multipole anomalies of the Cosmic Microwave Background has received much attention during the last few years. It is still not ascertained whether these anomalies are indeed primordial or the…
References
SHOWING 1-10 OF 31 REFERENCES
Suppressing the lower multipoles in the CMB anisotropies
- Physics
- 2003
The Cosmic Microwave Background (CMB) anisotropy power on the largest angular scales observed both by WMAP and COBE DMR appears to be lower than the one predicted by the standard model of cosmology…
Two‐point anisotropies in WMAP and the cosmic quadrupole
- Physics
- 2003
Large-scale modes in the temperature anisotropy power spectrum C l measured by the Wilkinson Microwave Anisotropy Probe (WMAP) seem to have lower amplitudes (C 2 , C 3 and C 4 ) than that expected in…
Getting around cosmic variance
- Physics
- 1997
Cosmic microwave background (CMB) anisotropies probe the primordial density field at the edge of the observable Universe. There is a limiting precision (“cosmic variance”) with which anisotropies can…
Can cosmic shear shed light on low cosmic microwave background multipoles?
- PhysicsPhysical review letters
- 2003
The lowest multipole moments of the cosmic microwave background (CMB) are smaller than expected for a scale-invariant power spectrum, and a cutoff in the primordial power spectrum below a comoving scale of k(c) approximately equal to 5.0 x 10(-4) Mpc(-1).
Structure in the COBE differential microwave radiometer first-year maps
- Physics
- 1992
Results of the first year of data from the differential microwave radiometers on the Cosmic Background Explorer are presented. Statistically significant structure that is well described as…
First-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
- Physics
- 2003
WMAP precision data enable accurate testing of cosmological models. We find that the emerging standard model of cosmology, a flat Λ-dominated universe seeded by a nearly scale-invariant adiabatic…
First year Wilkinson Microwave Anisotropy Probe (WMAP) observations: Preliminary maps and basic results
- Physics
- 2003
We present full-sky microwave maps in five frequency bands (23-94 GHz) from the Wilkinson Microwave Anisotropy Probe (WMAP) first-year sky survey. Calibration errors are less than 0.5%, and the low…
Dodecahedral space topology as an explanation for weak wide-angle temperature correlations in the cosmic microwave background
- PhysicsNature
- 2003
A simple geometrical model of a finite space—the Poincaré dodecahedral space—which accounts for WMAP's observations with no fine-tuning required is presented, and the model also predicts temperature correlations in matching circles on the sky.
Microwave background anisotropy in a toroidal universe.
- PhysicsPhysical review letters
- 1993
Large-scale cosmic microwave background temperature fluctuations are calculated for a universe with the topology of a 3-torus and it is found that a topologically ``small'' universe is no longer an interesting cosmological model.
First year Wilkinson Microwave Anisotropy Probe (WMAP) observations: The Angular power spectrum
- Physics
- 2003
We present the angular power spectrum derived from the first-year Wilkinson Microwave Anisotropy Probe (WMAP) sky maps. We study a variety of power spectrum estimation methods and data combinations…