Results 261 to 270 of about 257,498 (300)

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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Reconstructing the inflationary power spectrum from cosmic microwave background radiation data

, 2001
The cosmic microwave background radiation (CMBR) holds information about almost all the fundamental cosmological parameters, and by performing a likelihood analysis of high precision CMBR fluctuation data, these parameters can be inferred.
S. Hannestad
semanticscholar   +1 more source

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 ...
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Quantum effects in the cosmic microwave background radiation

Physics Letters A, 1990
Abstract Based on the quantum correlated general relativistic Vlasov equations in an Einstein-de Sitter universe, we show that quantum effects are beyond measurability in the cosmic microwave background radiation.
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Measuring the Cosmic Microwave Background Radiation (CMBR) polarization with QUIET

, 2008
A major goal of upcoming experiments measuring the Cosmic Microwave Background Radiation (CMBR) is to reveal the subtle signature of inflation in the polarization pattern which requires unprecedented sensitivity and control of systematics.
D. Samtleben, F. C. Collaboration
semanticscholar   +1 more source

Interpretation of the cosmic microwave background radiation anisotropy detected by the COBE Differential Microwave Radiometer

, 1992
The large-scale cosmic background anisotropy detected by the COBE Differential Microwave Radiometer (DMR) instrument is compared to the sensitive previous measurements on various angular scales, and to the predictions of a wide variety of models of ...
E. Wright, S. Meyer, C. Bennett, N. Boggess, E. Cheng, M. Hauser, A. Kogut, C. Lineweaver, J. Mather, G. Smoot, R. Weiss, S. Gulkis, G. Hinshaw, M. Janssen, T. Kelsall, P. Lubin, S. Moseley, T. Murdock, R. Shafer, R. Silverberg, D. Wilkinson   +20 more
semanticscholar   +1 more source

Statistics of Cosmic Microwave Background Radiation with the Cosmic String Model

International Journal of Modern Physics D, 1997
We have studied the cosmic microwave background radiation by simulating the cosmic string network induced anisotropies on the sky. The large-angular size simulations are based on the Kaiser–Stebbins effect calculated from full cosmic-string network simulation.
Petri Mähönen, Toivo Voll, Toivo Voll, Tetsuya Hara, Shigeru J. Miyoshi   +4 more
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Neutrino physics with the cosmic microwave background radiation

Nuclear Physics B - Proceedings Supplements, 2000
Abstract The fluctuations in the Cosmic Microwave Background Radiation (CMBR) contain key information about the physical conditions in the early universe. Two new satellites are expected to measure the CMBR fluctuation spectrum so precisely that almost all the relevant cosmological parameters can be determined at the percent level. This is great news
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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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3 K: The Cosmic Microwave Background Radiation

, 1995
Preface 1. Cosmology 2. The early history of CBR studies 3. Radio astronomy 4. The spectrum of the CBR 5. What we learn from observations of the CBR spectrum 6. Searches for anisotropy in the CBR on large angular scales 7.
R. B. Partridge, John C. Mather
semanticscholar   +1 more source