Results 141 to 150 of about 1,037 (174)

Ripples in the Cosmic Microwave Background Radiation

Astronomers' Universe, 2016
The Cosmic Microwave Background Explorer satellite (COBE) of NASA, launched in 1989, measured with unprecedented precision the intensity of the cosmic microwave background radiation (CMB) at many wavelengths and in all directions over the sky. The spatial resolution (sharpness) of the microwave optics in the satellite was 7°—14 times the diameter of ...
Edward Van den Heuvel, Van Den Heuvel Edward   +1 more
exaly   +2 more sources

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.
exaly   +2 more sources

Cosmic Microwave Background Radiation

Reviews of Modern Physics, 1999
Most astronomers and physicists now believe that we live in an expanding universe that evolved from an early state of extremely high density and temperature. Measurements of the spectrum and anisotropy of the cosmic microwave background radiation (CMBR) provide strong evidence supporting this picture. Today, the spectrum of the CMBR matches that of a 2.
Lyman Page, David Wilkinson
openaire   +1 more source

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
openaire   +2 more sources

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
openaire   +1 more source

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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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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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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The cosmic microwave background radiation and cosmology

Classical and Quantum Gravity, 1994
I review recent observational results on the fundamental properties of the cosmic microwave-background radiation, with special emphasis on the findings of the COBE satellite. These include the present temperature of the radiation, , and the first convincing detection of angular variations in its intensity, at a level on scales .
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Fluctuations in the Cosmic Microwave Background Radiation

1998
The study of the power-spectrum of spatial fluctuations in the Cosmic Microwave Background Radiation provides one of the most important means of confronting theories of the origin of the large-scale structure of the Universe with observation. The problem addressed in this chapter is how to relate the fluctuations in the dark and baryonic matter on the ...
openaire   +1 more source