If the hemispherical power asymmetry observed in the cosmic microwave background (CMB) on large angular scales is attributable to a superhorizon curvaton fluctuation, then the simplest model predicts that the primordial density fluctuations should be similarly asymmetric on all smaller scales. The distribution of high-redshift quasars was recently used to constrain the power asymmetry on scales...

ABSTRACT We study the significance of running vacuum model in which energy density depends on square Hubble parameter, comparison with ΛCDM model. The Bayesian inference method is employed to appraise relative model, using combined data sets, SN1a+CMB+BAO and SN1a+CMB+BAO+OHD. parameters corresponding errors are estimated from marginal probability function parameters. parameter that distinguish...

Recent detections of cosmic microwave background (CMB) anisotropy at half-degree angular scales show considerable scatter in the reported amplitude even at similar angular resolution. We use Monte Carlo techniques to simulate the current set of medium-scale CMB observations, including all relevant aspects of sky coverage and measurement technique. The scatter in the reported amplitudes is well ...

The uncertainties of estimates of cosmic microwave background (CMB) heterogeneity using Cosmic Background Explorer (COBE) data are extremely sensitive to assumptions about the CMB, especially where foreground sources dominate. At 4.5% statistical significance, the COBE least-squares estimate of the CMB quadrupole using data at galactic latitudes lbl > 200 is consistent with a model in which the...

We study the Cosmic Microwave Background (CMB) anisotropies produced by cosinetype quintessence models. In our analysis, effects of the adiabatic and isocurvature fluctuations are both taken into account. For purely adiabatic fluctuations with scale invariant spectrum, we obtain a stringent constraint on the model parameters using the CMB data from COBE, BOOMERanG and MAXIMA. Furthermore, it is...

We study the Cosmic Microwave Background (CMB) anisotropies produced by cosine-type quintessence models. In our analysis, effects of the adiabatic and isocurvature fluctuations are both taken into account. For purely adiabatic fluctuations with scale invariant spectrum, we obtain a stringent constraint on the model parameters using the CMB data from COBE, BOOMERanG and MAXIMA. Furthermore, it i...

We present measurements of the cosmic microwave background (CMB) power spectrum made by the Atacama Cosmology Telescope at 148 GHz and 218 GHz, as well as the cross-frequency spectrum between the two channels. Our results clearly show the second through the seventh acoustic peaks in the CMB power spectrum. The measurements of these higher-order peaks provide an additional test of the ΛCDM cosmo...

Cosmic microwave background (CMB) studies underpin our understanding of the universe and its history. Until recently, we have relied principally on CMB temperature observations to build our standard cosmological model, but today the field forges ahead into its next frontier – CMB polarization anistropy. Polarization measurements will furnish fresh and independent information on the primordial d...

In this paper, we present the self-similar symmetry (SSS) model that describes the hierarchical structure of the universe. The model is based on the concept of self-similarity, which explains the symmetry of the cosmic microwave background (CMB). The approximate length and time scales of the six hierarchies of the universe—grand unification, electroweak unification, the atom, the pulsar, the so...

The recent re-evaulation of the peculiar velocity field outside the Local Supercluster (Dekel et al. 1999) has permitted a re-examination of the origins of the peculiar velocity field within the Local Supercluster using the Mark III Catalog of Galaxy Peculiar Velocities. It is shown that the large-scale coherent pattern of peculiar velocities within the LSC are well-fit by a combination of the ...