Journal ArticleDOI
Degree Angular Scale Interferometer First Results: A Measurement of the Cosmic Microwave Background Angular Power Spectrum
N. W. Halverson,E. M. Leitch,C. Pryke,John M Kovac,John E. Carlstrom,W. L. Holzapfel,M. Dragovan,J. K. Cartwright,Brian Mason,Stephen Padin,T. J. Pearson,A. C. S. Readhead,Martin C. Shepherd +12 more
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TLDR
The first season of observations with the Degree Angular Scale Interferometer (DASI) was conducted at the South Pole in the austral summer 1999-2000, and observations throughout the following austral winter.Abstract:
We present measurements of anisotropy in the cosmic microwave background (CMB) from the first season of observations with the Degree Angular Scale Interferometer (DASI). The instrument was deployed at the South Pole in the austral summer 1999-2000, and we made observations throughout the following austral winter. We present a measurement of the CMB angular power spectrum in the range 100 < l < 900 in nine bands with fractional uncertainties in the range 10%-20% and dominated by sample variance. In this paper, we review the formalism used in the analysis, in particular the use of constraint matrices to project out contaminants such as ground and point source signals and to test for correlations with diffuse foreground templates. We find no evidence of foregrounds other than point sources in the data, and we find a maximum likelihood temperature spectral index β = -0.1 ± 0.2 (1 σ), consistent with CMB. We detect a first peak in the power spectrum at l ~ 200, in agreement with previous experiments. In addition, we detect a peak in the power spectrum at l ~ 550 and power of similar magnitude at l ~ 800, which are consistent with the second and third harmonic peaks predicted by adiabatic inflationary cosmological models.read more
Citations
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The impact of an extra background of relativistic particles on the cosmological parameters derived from the cosmic microwave background
TL;DR: In this article, the effect of removing this assumption has on the determination of the various cosmological parameters was investigated, and it was shown that ω r e l is nearly degenerate with the amount of energy in matter, and that its inclusion in CMB parameter estimation also affects the present constraints on other parameters such as the curvature or the scalar spectral index of primordial fluctuations.
Journal ArticleDOI
Modified Chaplygin gas and constraints on its B parameter from cold dark matter and unified dark matter energy cosmological models
TL;DR: In this paper, the authors study modified Chaplygin gas (MCG) as a candidate for dark energy and predict the values of parameters of the gas for a physically viable cosmological model.
Journal ArticleDOI
Density Perturbations for Running Cosmological Constant
TL;DR: In this paper, the authors investigated the dynamics of density and metric perturbations for the previously developed model where the decay of the vacuum energy into matter (or vice versa) is due to the renormalization group (RG) running of the cosmological constant (CC) term.
Journal ArticleDOI
Karhunen-Loève Estimation of the Power Spectrum Parameters from the Angular Distribution of Galaxies in Early Sloan Digital Sky Survey Data
Alexander S. Szalay,Bhuvnesh Jain,Bhuvnesh Jain,Takahiko Matsubara,Ryan Scranton,Ryan Scranton,Michael S. Vogeley,Andrew J. Connolly,Scott Dodelson,Scott Dodelson,Daniel J. Eisenstein,Joshua A. Frieman,Joshua A. Frieman,James E. Gunn,Lam Hui,David Johnston,David Johnston,Stephen M. Kent,Martin Kerscher,Jon Loveday,Avery Meiksin,Vijay K. Narayanan,Robert C. Nichol,Liam O'Connell,Adrian Pope,Roman Scoccimarro,Roman Scoccimarro,Ravi K. Sheth,Albert Stebbins,Michael A. Strauss,István Szapudi,Max Tegmark,Idit Zehavi,James Annis,Neta A. Bahcall,Jon Brinkmann,István Csabai,Masataka Fukugita,Greg Hennessy,Zeljko Ivezic,Gillian R. Knapp,Peter Z. Kunszt,D. Q. Lamb,Brian C. Lee,Robert H. Lupton,Jeffrey R. Munn,John Peoples,Jeffrey R. Pier,Constance M. Rockosi,David J. Schlegel,Christopher Stoughton,Douglas L. Tucker,Brian Yanny,Donald G. York +53 more
TL;DR: In this paper, a maximum likelihood analysis is used to estimate parameters that set the shape and amplitude of the three-dimensional power spectrum of galaxies in the SDSS magnitude-limited sample with r* less than 21.
Journal ArticleDOI
Predictions of the Angular Power Spectrum of Clustered Extragalactic Point Sources at Cosmic Microwave Background Frequencies from Flat and All-Sky Two-dimensional Simulations
TL;DR: In this article, the angular power spectrum of extragalactic point sources (EPSs) was modeled by using a method for simulating realistic two-dimensional distributions of clustered EPSs.
References
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Journal ArticleDOI
Inflationary universe: A possible solution to the horizon and flatness problems
TL;DR: In this paper, the authors proposed a model of hot big-bang cosmology where the early universe is assumed to be highly homogeneous, in spite of the fact that separated regions were causally disconnected (horizon problem).
Journal ArticleDOI
A new inflationary universe scenario: A possible solution of the horizon, flatness, homogeneity, isotropy and primordial monopole problems
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Cosmology for Grand Unified Theories with Radiatively Induced Symmetry Breaking
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A New Inflationary Universe Scenario: A Possible Solution of the Horizon, Flatness, Homogeneity, Isotropy and Primordial Monopole Problems
TL;DR: A new inflationary universe scenario is suggested in this paper, which is free of the shortcomings of the previous one and provides a possible solution of the horizon, flatness, homogeneity and isotropy problems in cosmology.
Cosmology for Grand Unified Theories With Radiatively Induced Symmetry Breaking
TL;DR: In this paper, the treatment of first-order phase transitions for standard grand unified theories is shown to break down for models with radiatively induced spontaneous symmetry breaking, leading to an explanation of the cosmological homogeneity, flatness, and monopole puzzles.
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