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
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Dark matter searches employing asymmetric velocity distributions obtained via the Eddington approach
TL;DR: In this paper, the energy distribution f(E ) of dark matter in our vicinity is obtained by starting from WIMP density profiles, in the framework of the Eddington approach, and the obtained distributions automatically have a velocity upper bound, as a consequence of the fact that they are associated with a gravitationally bound system, and are characterized by an anisotropy parameter β.
Journal ArticleDOI
Some characteristics of three exact solutions of Einstein equations minimally coupled to a Quintessence field
TL;DR: In this article, the authors show some characteristics of three exact solutions to Einstein's gravity equation minimally coupled to a Quintessence field, including eternal inflation, several other interesting inflationary processes, such as transitory inflation.
Journal ArticleDOI
Effects of the cosmological constant on compact star in quark-meson coupling model
TL;DR: In this paper, the authors derived the Tolman-Oppenheimer-Volkoff (TOV) equation taking into account the cosmological constant in static and spherically symmetric metric.
Journal ArticleDOI
Phantom Appearance of Non-phantom Matter in Anisotropic Cosmological Model
T. P. Singh,Raghavendra Chaubey +1 more
TL;DR: Two cosmological models with non-phantom matter having the same expansion of the universe as phantom cosmologies are constructed in anisotropic Bianchi type-V universe as mentioned in this paper.
Journal ArticleDOI
Multi-component power spectra estimation method for multi-detector observations of the cosmic microwave background
TL;DR: In this article, a new method for multi-component power spectra estimation in multi-frequency observations of the CMB is presented, based on matching the cross and auto-power spectra of observation maps to their expected values.
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
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.
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Cosmology for Grand Unified Theories with Radiatively Induced Symmetry Breaking
TL;DR: In this article, 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.
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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