On the cosmic microwave background large-scale angular correlations

Bernui, Armando; Villela, T.; Wuensche, Carlos Alexandre; Leonardi, R.; Ferreira, Ivan Soares

doi:10.1051/0004-6361:20054243

Cited by 69 publications

(75 citation statements)

References 32 publications

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“…Here we are specifically concerned with the possibility that rotational invariance may have been broken during inflation by an effect that has subsequently disappeared, and study the effects of such breaking on CMB anisotropies. It is possible that such an effect has already been detected, in the form of the "Axis of Evil," an apparent alignment of the CMB multipoles on very large scales [22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42]. Although its statistical significance is hard to quantify, a variety of models have been put forward to explain this phenomenon [43,44,45,46,47,48,49,50,51,52].…”

Section: Introductionmentioning

confidence: 99%

Erratum: Imprints of a primordial preferred direction on the microwave background [Phys. Rev. D75, 083502 (2007)]

Ackerman¹,

Carroll²,

Wise³

2009

Phys. Rev. D

200

361

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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 examine the consequences of a small breaking of rotational invariance during the inflationary era when the primordial density fluctuations were generated. Assuming that a fixed-norm vector picked out a preferred direction during the inflationary era, we explore the imprint it would leave on the cosmic microwave background anisotropy, and provide explicit formulas for the expected amplitudes a lm a * l ′ m ′ of the spherical-harmonic coefficients. We suggest that it is natural to expect that the imprint on the primordial power spectrum of a preferred spatial direction is approximately scale-invariant, and examine a simple model in which this is true.

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Section: Introductionmentioning

confidence: 99%

Erratum: Imprints of a primordial preferred direction on the microwave background [Phys. Rev. D75, 083502 (2007)]

Ackerman¹,

Carroll²,

Wise³

2009

Phys. Rev. D

200

361

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“…The octopole presented an unusual planarity and a correlation with the In the spirit of participating in reproducible research, we make all codes and resulting products which constitute main results of this paper public here: http://www.cosmostat.org/anomaliesCMB.html quadrupole (Tegmark et al 2003;de Oliveira-Costa et al 2004;Slosar & Seljak 2004;Copi et al 2010). Other anomalies include a north/south power asymmetry (Eriksen et al 2004;Bernui et al 2006), an anomalous "cold spot" in the CMB (Vielva et al 2004;Cruz et al 2005Cruz et al , 2006, alignments of other large-scale multipoles (Schwarz et al 2004;Copi et al 2006), the so-called Axis of Evil (Land & Magueijo 2005a), and other violations of statistical isotropy (Hajian & Souradeep 2003;Land & Magueijo 2005b).…”

Section: Introductionmentioning

confidence: 99%

Removal of two large-scale cosmic microwave background anomalies after subtraction of the integrated Sachs-Wolfe effect

Rassat

Starck

Dupé

2013

A&A

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Context. Although there is currently a debate over the significance of the claimed large-scale anomalies in the cosmic microwave background (CMB), their existence is not totally dismissed. In parallel to the debate over their statistical significance, recent work has also focussed on masks and secondary anisotropies as potential sources of these anomalies. Aims. In this work we investigate simultaneously the impact of the method used to account for masked regions as well as the impact of the integrated Sachs-Wolfe (ISW) effect, which is the large-scale secondary anisotropy most likely to affect the CMB anomalies. In this sense, our work is an update of previous works. Our aim is to identify trends in CMB data from different years and with different mask treatments. Methods. We reconstruct the ISW signal due to 2 Micron All-Sky Survey (2MASS) and NRAO VLA Sky Survey (NVSS) galaxies, effectively reconstructing the low-redshift ISW signal out to z ∼ 1. We account for regions of missing data using the sparse inpainting technique. We test sparse inpainting of the CMB, large scale structure and ISW and find that it constitutes a bias-free reconstruction method suitable to study large-scale statistical isotropy and the ISW effect. Results. We focus on three large-scale CMB anomalies: the low quadrupole, the quadrupole/octopole alignment, and the octopole planarity. After sparse inpainting, the low quadrupole becomes more anomalous, whilst the quadrupole/octopole alignment becomes less anomalous. The significance of the low quadrupole is unchanged after subtraction of the ISW effect, while the trend amongst the CMB maps is that both the low quadrupole and the quadrupole/octopole alignment have reduced significance, yet other hypotheses remain possible as well (e.g. exotic physics). Our results also suggest that both of these anomalies may be due to the quadrupole alone. While the octopole planarity significance is reduced after inpainting and after ISW subtraction, however, we do not find that it was very anomalous to start with.

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“…28), although they are often regarded as mere curiosities. We focus here on the lack of correlation [29][30][31][32][33][34][35][36][37] and explain why it deserves attention. The low variance anomaly 38 is a closely related observation, 36 so that the terms "lack of power" and "lack of correlation" are used as synonymous.…”

Section: Cmb Low Multipoles Anomaliesmentioning

confidence: 99%

Recent results and perspectives on cosmology and fundamental physics from microwave surveys

Burigana

Battistelli

Benetti

et al. 2017

The Fourteenth Marcel Grossmann Meeting

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Recent cosmic microwave background (CMB) data in temperature and polarization have reached high precision in estimating all the parameters that describe the current socalled standard cosmological model. Recent results about the integrated Sachs-Wolfe (ISW) effect from CMB anisotropies, galaxy surveys, and their cross-correlations are presented. Looking at fine signatures in the CMB, such as the lack of power at low multipoles, the primordial power spectrum (PPS) and the bounds on non-Gaussianities, complemented by galaxy surveys, we discuss inflationary physics and the generation of primordial perturbations in the early universe. Three important topics in particle physics, the bounds on neutrinos masses and parameters, on thermal axion mass and on the neutron lifetime derived from cosmological data are reviewed, with attention to the comparison with laboratory experiment results. Recent results from cosmic polarization rotation (CPR) analyses aimed at testing the Einstein equivalence principle (EEP) are presented. Finally, we discuss the perspectives of next radio facilities for the improvement of the analysis of future CMB spectral distortion experiments.Keywords: Cosmology; background radiations; radio; microwave; origin and formation of the universe; particle-theory and field-theory models of the early universe; observational cosmology; large scale structure of the universe; dark matter; dark energy; elementary particle processes.

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On the cosmic microwave background large-scale angular correlations

Cited by 69 publications

References 32 publications

Erratum: Imprints of a primordial preferred direction on the microwave background [Phys. Rev. D75, 083502 (2007)]

Erratum: Imprints of a primordial preferred direction on the microwave background [Phys. Rev. D75, 083502 (2007)]

Removal of two large-scale cosmic microwave background anomalies after subtraction of the integrated Sachs-Wolfe effect

Recent results and perspectives on cosmology and fundamental physics from microwave surveys

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