Results 211 to 220 of about 54,682 (254)

Multiscaling of cosmic microwave background radiation

Physics Letters A, 2002
The multiscaling features of structure functions of cosmic microwave background (CMB) radiation have been studied using the new data available with the resolution of the order of a degree (combined QMAP and Saskatoon CMB radiation maps). It is shown that the scaling exponents of the CMB structure functions in the angular scale interval 0.9–4 ◦ are ...
A Bershadskii, K.R Sreenivasan
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The Cosmic Microwave Background Radiation

2001
Abstract Everyone agrees that 1965 was an important year in the historical development of cosmology; indeed, some take it as the birth year of mod ern cosmology. The book Origins, by Alan Lightman and Roberta Brawer (see our recommended reading) consists of interviews with the authors’ choices of leading cosmologists from their ...
Ralph A Alpher, Robert Herman
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Dark Energy and the Cosmic Microwave Background Radiation

Physical Review Letters, 2000
We find that current cosmic microwave background anisotropy data strongly constrain the mean spatial curvature of the Universe to be near zero, or, equivalently, the total energy density to be near critical-as predicted by inflation. This result is robust to editing of data sets, and variation of other cosmological parameters (totaling seven, including
S, Dodelson, L, Knox
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Interpretation of observed cosmic microwave background radiation

Nature, 1977
It is argued that the 'surface of last scattering' of the observed microwave background radiation corresponds to the distribution of dust in galaxies or protogalaxies with a temperature of about 110 K at the epoch corresponding to Z roughly equal to 40.
HANNES ALFVEN, ASOKA MENDIS
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The Cosmic Microwave Radiation Background

2008
Abstract Before the mid-1960s by far the greatest part of our information about the structure and evolution of the universe came from observations of the redshifts and distances of distant galaxies, discussed in the previous chapter.
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Measurement of Cosmic Microwave Background Radiation

IEEE Transactions on Microwave Theory and Techniques, 1968
The techniques associated with the measurement of antenna temperature at microwave frequencies are discussed. A number of experiments designed to measure cosmic microwave background radiation are described and their results compared. These results give a very good fit to a 3/spl deg/K black body curve between 1.4 and 35 GHz.
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Cosmic Microwave Background Radiation Anisotropies in Brane Worlds

Physical Review Letters, 2003
We propose a new formulation to calculate the cosmic microwave background (CMB) spectrum in the Randall-Sundrum two-brane model based on recent progress in solving the bulk geometry using a low energy approximation. The evolution of the anisotropic stress imprinted on the brane by the 5D Weyl tensor is calculated.
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Polarization of the cosmic microwave background radiation

Pramana, 1999
In re-ionized models, the measurement of polarization of CMBR can be a good criterion to narrow down the parameter space for cosmological models. A Vishniac-type effect in second order polarization over arc minute scales has been calculated. It has been shown that while the effect is very small (∼10−2 µK) for CDM models, it can be ...
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Fluctuations in Cosmic Microwave Background Radiation

2013
Cosmic microwave background (CMB) radiation is composed of photons which have decoupled from electrons in the epoch of the hydrogen and helium recombination at \(z = 1{,}089\) and it is observed as the perfectly black body radiation whose averaged temperature is 2.725 K. More precisely, however, the CMB involves tiny spatial fluctuations. Theoretically,
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Interpretation of observed cosmic microwave background radiation

Nature, 1978
The Alfven and Mendis (1977) conclusion that dust grains in galaxies render the universe opaque to cosmic microwave background at a red shift ratio equal to 40 is challenged by a calculation of the opacity of galactic dust grains to the microwave background radiation from the time of decoupling at emission red shift ratio equal to 1500 to the present ...
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