A possible contribution to CMB anisotropies at high  from primordial voids

Griffiths, Louise M.; Kunz, M.; Silk, Joseph

doi:10.1046/j.1365-8711.2003.06211.x

Cited by 19 publications

(26 citation statements)

References 57 publications

(60 reference statements)

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“…Komatsu & Seljak 2002;Oh, Cooray, & Kamionkowski 2003;Subramanian, Seshadri, & Barrow 2003;Griffiths, Kunz, & Silk 2003), and the results we present in this paper improve the bandpower constraint. Binning all the 2000+2001 data above ℓ = 1960 together, we find a bandpower of 355 ± 103 µK 2 (random error only).…”

Section: Power Spectrum Analysissupporting

confidence: 61%

Extended Mosaic Observations with the Cosmic Background Imager

Readhead

Mason

Contaldi

et al. 2004

ApJ

334

305

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Two years of microwave background observations with the Cosmic Background Imager (CBI) have been combined to give a sensitive, high resolution angular power spectrum over the range 400 < ℓ < 3500. This power spectrum has been referenced to a more accurate overall calibration derived from the Wilkinson Microwave Anisotropy Probe. The data cover 90 deg 2 including three pointings targeted for deep observations. The uncertainty on the ℓ > 2000 power previously seen with the CBI is reduced. Under the assumption that any signal in excess of the primary anisotropy is due to a secondary Sunyaev-Zeldovich anisotropy in distant galaxy clusters we use CBI, Arcminute Cosmology Bolometer Array Receiver, and Berkeley-Illinois-Maryland Association array data to place a constraint on the present-day rms mass fluctuation on 8 h −1 Mpc scales, σ 8 . We present the results of a cosmological parameter analysis on the ℓ < 2000 primary anisotropy data which show significant improvements in the parameters as compared to WMAP alone, and we explore the role of the small-scale cosmic microwave background data in breaking parameter degeneracies.

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Section: Power Spectrum Analysissupporting

confidence: 61%

Extended Mosaic Observations with the Cosmic Background Imager

Readhead

Mason

Contaldi

et al. 2004

ApJ

334

305

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“…This ''excess power'' has been interpreted as the SZ effect produced by intervening galaxy clusters (Mason et al 2003;Readhead et al 2004a;Bond et al 2005). On the other hand, a variety of models, including nonstandard primordial effects, have also been proposed as possible explanations (Cooray & Melchiorri 2002;Griffiths et al 2003;Subramanian et al 2003). The unique photon emission spectrum of the thermal SZ effect distinguishes it from these alternative explanations for the observed anisotropy.…”

Section: Anisotropies At ' > 2000mentioning

confidence: 99%

“…This possibility is being investigated with a 30 GHz continuum receiver at the Green Bank Telescope ( Mason et al 2005). Alternative origins of the excess involve nonstandard ingredients in the cosmological model, such as primordial voids and magnetic fields (Cooray & Melchiorri 2002;Griffiths et al 2003;Subramanian et al 2003). The frequency spectrum of the thermal SZ effect is distinctly different from that of the primordial anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Improved Measurements of the CMB Power Spectrum with ACBAR

Kuo

Ade

Bock

et al. 2007

ApJ

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We report improved measurements of temperature anisotropies in the cosmic microwave background (CMB) radiation made with the Arcminute Cosmology Bolometer Array Receiver (ACBAR). In this paper, we use a new analysis technique and include 30% more data from the 2001 and 2002 observing seasons than the first release to derive a new set of band-power measurements with significantly smaller uncertainties. The planet-based calibration used previously has been replaced by comparing the flux of RCW38 as measured by ACBAR and BOOMERANG to transfer the WMAP-based BOOMERANG calibration to ACBAR. The resulting power spectrum is consistent with the theoretical predictions for a spatially flat, dark energy dominated LCDM cosmology including the effects of gravitational lensing. Despite the exponential damping on small angular scales, the primary CMB fluctuations are detected with a signal-to-noise ratio of greater than 4 up to multipoles of l=2000. This increase in the precision of the fine-scale CMB power spectrum leads to only a modest decrease in the uncertainties on the parameters of the standard cosmological model. At high angular resolution, secondary anisotropies are predicted to be a significant contribution to the measured anisotropy. A joint analysis of the ACBAR results at 150 GHz and the CBI results at 30 GHz in the multipole range 2000 < l < 3000 shows that the power, reported by CBI in excess of the predicted primary anisotropy, has a frequency spectrum consistent with the thermal Sunyaev-Zel'dovich effect and inconsistent with primary CMB. The results reported here are derived from a subset of the total ACBAR data set; the final ACBAR power spectrum at 150 GHz will include 3.7 times more effective integration time and 6.5 times more sky coverage than is used here.Comment: 19 pages, 9 figures, Ap

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“…We limit our analysis to 2 < l < 2000 because secondary anisotropy contributions, such as the SunyaevZel'dovich effect (Sunyaev & Zel'dovich 1970) and/or the signature of primordial voids (Griffiths, Kunz, & Silk 2003), may dominate at l > 2000. We bin the WMAP data into 70 bins, carefully chosen so as not to smooth out any genuine features in the data, following the method of Appendix B.…”

Section: Goodness Of Fit Of the Concordance Model To The Cmbmentioning

confidence: 99%

Testing the Cosmic Microwave Background Data for Systematic Effects

Griffiths

Lineweaver

2004

ApJ

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Under the assumption that the concordance Ã cold dark matter (CDM) model is the correct model, we test the cosmic microwave background (CMB) anisotropy data for systematic effects by examining the bandpass temperature residuals with respect to this model. Residuals are analyzed as a function of angular scale l, Galactic latitude, frequency, calibration source, instrument type, and several other variables that may be associated with potential systematic effects. Our main result is that we find no significant systematic errors associated with these variables. However, we do find marginal evidence for a trend associated with Galactic latitude indicative of Galactic contamination.

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A possible contribution to CMB anisotropies at high from primordial voids

Cited by 19 publications

References 57 publications

Extended Mosaic Observations with the Cosmic Background Imager

Extended Mosaic Observations with the Cosmic Background Imager

Improved Measurements of the CMB Power Spectrum with ACBAR

Testing the Cosmic Microwave Background Data for Systematic Effects

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