scholarly journals New Limits to the Small Scale Fluctuations in the Cosmic Background Radiation

1983 ◽  
Vol 104 ◽  
pp. 125-126
Author(s):  
K. I. Kellermann ◽  
E. B. Fomalont ◽  
J. V. Wall
Keyword(s):  
Cosmic Microwave Background ◽  
Radio Source ◽  
Flux Density ◽  
Background Radiation ◽  
Cosmic Background Radiation ◽  
Small Region ◽  
Small Scale ◽  
Microwave Background ◽  
Cosmic Background ◽  
Microwave Background Radiation

The VLA has been used at 4.9 GHz to observe a small region of sky in order to extend the radio source count to low flux density (Fomalont et al., these proceedings) and to look for small scale fluctuations in the 2.7 K cosmic microwave background radiation.

scholarly journals Observation and Interpretation of the Cosmic Microwave Background Spectrum

1992 ◽  
Vol 9 ◽  
pp. 275-279 ◽  
Author(s):  
J. C. Mather
Keyword(s):  
Cosmic Microwave Background ◽  
Background Radiation ◽  
Far Infrared ◽  
Cosmic Background Radiation ◽  
Microwave Measurements ◽  
Microwave Background ◽  
Background Spectrum ◽  
Cosmic Background

AbstractRecent precise observations of the microwave and submillimeter cosmic background radiation are summarized, including rocket experiments, the FIRAS (Far InfraRed Absolute Spectrophotometer) on the COBE, CN results, and microwave measurements. Theoretical implications are summarized.

scholarly journals The Angular Distribution of the Cosmic Background Radiation

1986 ◽  
Vol 7 ◽  
pp. 307-319
Author(s):  
R. B. Partridge
Keyword(s):  
Angular Distribution ◽  
Early Universe ◽  
Background Radiation ◽  
Cosmic Background Radiation ◽  
Current Status ◽  
Microwave Background ◽  
Cosmic Background ◽  
Dipole Component ◽  
Upper Limits ◽  
Microwave Background Radiation

AbstractCrucial cosmological information is provided by the observed angular distribution (isotropy) of the cosmic microwave background radiation. This report treats the current status of searches for anisotroples in this radiation on all angular scales from 180° (the dipole component) to 6″. With the exception of the dipole component, only upper limits (at ~ 10-4 in ΔT/T) are available, yet these upper limits have played an important role in refining models of the early Universe and of the origin of structure within it.

scholarly journals Deep Radio Source Counts and Small Scale Fluctuations of the Microwave Background Radiation

1983 ◽  
Vol 104 ◽  
pp. 131-133
Author(s):  
L. Danese ◽  
G. de Zotti ◽  
N. Mandolesi
Keyword(s):  
Radio Source ◽  
Background Radiation ◽  
Areal Density ◽  
Small Scale ◽  
Microwave Background ◽  
Direct Evaluation ◽  
Luminosity Functions ◽  
Microwave Background Radiation ◽  
Model Independent ◽  
Image Position

Source counts which now extend to surface densities of ∼105 sources/sr make possible a direct evaluation of the radio source contribution to the small-scale fluctuations in the microwave background on scales larger than ∼10′, at wavelengths cm. Comprehensive radio spectral data permit a straightforward and largely model-independent extrapolation of the N(S) relation to shorter wavelengths. On the other hand, Peacock and Gull (1981, hereafter PG) have constructed a set of models which incorporate a wealth of additional data, such as local luminosity functions, luminosity/redshift distributions, luminosity-spectral index correlations; they can therefore be exploited to optimize the extrapolations both to higher frequencies and to fainter flux densities. Only one of these models, however, namely No. 4, is consistent with the recent P(D) results (Wall et al. 1982; Ledden et al. 1980) which provide information on the areal density of sources at s~1mJy; therefore, in the following we shall focus on it.

A NEW VIEW ON THE PROBLEM OF ANISOTROPY OF THE COSMIC BACKGROUND RADIATION

1993 ◽  
Vol 02 (01) ◽  
pp. 97-104 ◽  
Author(s):  
V.G. GURZADYAN ◽  
A.A. KOCHARYAN
Keyword(s):  
Negative Curvature ◽  
Background Radiation ◽  
Cosmological Parameters ◽  
Cosmic Background Radiation ◽  
Geometrical Shape ◽  
Microwave Background ◽  
Cosmic Background ◽  
Microwave Background Radiation ◽  
History Of ◽  
The Universe

The anisotropy properties of the Cosmic Microwave Background Radiation (CMB) are considered within the framework of the photon beam mixing effect developed earlier. The existence of an observable characteristic of the CMB is shown, namely the geometrical shape of anisotropy spots and their degree of complexity, which can contain unique information on cosmological parameters and the life history of the Universe. If future experiments (COBE and others) indicate such features of anisotropy maps, then one can have serious evidence for the negative curvature of the Universe.

Interpretation of anisotropy in the cosmic background radiation

1982 ◽  
Vol 307 (1497) ◽  
pp. 97-110 ◽  
Keyword(s):  
Galaxy Formation ◽  
Large Scale ◽  
Background Radiation ◽  
Cosmic Background Radiation ◽  
Microwave Background ◽  
Cosmic Background ◽  
Microwave Background Radiation

We review mechanisms for producing temperature and polarization anisotropies in the microwave background radiation, and summarize their relation to the large-scale distribution of matter and to theories of galaxy formation. We also review possible sources of ambiguity in interpreting data, in particular the unknown opacity of the pregalactic gas and the possible contribution of discrete sources of radiation. Strategies for removing these ambiguities are discussed.

On the cosmic background radiation and the age of the Universe

2013 ◽  
Vol 26 (3) ◽  
pp. 358-361
Author(s):  
Leandro Meléndez Lugo
Keyword(s):  
Background Radiation ◽  
Cosmic Background Radiation ◽  
Big Bang ◽  
Microwave Background ◽  
Dispersion Process ◽  
Cosmic Background ◽  
Microwave Background Radiation ◽  
Age Of The Universe ◽  
The Big Bang ◽  
The Universe

A basic fundamental analysis indicates that any radiation emitted by remote objects, such as galaxies and quasars, has only a limited age in comparison with that of the Universe. The radiation emitted by such objects thousands of millions of years ago is the oldest one that can be detected. Any previous radiation emitted by these bodies during their dispersion process resulting from the Universe expansion cannot be detected. It is shown on the basis of this analysis that the age of the Universe is much greater than that established as 13,700 millions of years and that the cosmic microwave background radiation must have a source other than the Big Bang.

scholarly journals Revisiting cosmic microwave background radiation using blackbody radiation inversion

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Koustav Konar ◽  
Kingshuk Bose ◽  
R. K. Paul
Keyword(s):  
Temperature Distribution ◽  
Cosmic Microwave Background ◽  
Background Radiation ◽  
Big Bang ◽  
Blackbody Radiation ◽  
Microwave Background ◽  
Background Spectrum ◽  
Microwave Background Radiation ◽  
Mathematical Process

AbstractBlackbody radiation inversion is a mathematical process for the determination of probability distribution of temperature from measured radiated power spectrum. In this paper a simple and stable blackbody radiation inversion is achieved by using an analytical function with three determinable parameters for temperature distribution. This inversion technique is used to invert the blackbody radiation field of the cosmic microwave background, the remnant radiation of the hot big bang, to infer the temperature distribution of the generating medium. The salient features of this distribution are investigated and analysis of this distribution predicts the presence of distortion in the cosmic microwave background spectrum.

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