scholarly journals An Upper Limit to the Intrinsic Anisotropy of the Microwave Background Radiation on a Scale of 7 Arc Minutes

1988 ◽  
Vol 130 ◽  
pp. 37-41
Author(s):  
A. C. S. Readhead ◽  
C. R. Lawrence ◽  
S. T. Myers ◽  
W. L. W. Sargent
Keyword(s):  
Background Radiation ◽  
Microwave Background ◽  
Owens Valley ◽  
Radio Observatory ◽  
Upper Limit ◽  
Microwave Background Radiation ◽  
Intrinsic Anisotropy

For the last four years we have been engaged on a program to look for intrinsic variations in the Microwave Background Radiation (MBR) at the Owens Valley Radio Observatory (OVRO). We summarize here the results of this continuing search.

scholarly journals The Cosmic Background Imager

2005 ◽  
Vol 201 ◽  
pp. 23-32
Author(s):  
T. J. Pearson ◽  
B. S. Mason ◽  
S. Padin ◽  
A. C. S. Readhead ◽  
M. C. Shepherd ◽  
...  
Keyword(s):  
Background Radiation ◽  
Clusters Of Galaxies ◽  
Microwave Background ◽  
Owens Valley ◽  
Radio Observatory ◽  
San Pedro ◽  
Cosmic Background ◽  
Microwave Background Radiation ◽  
Cmb Fluctuations ◽  
Cosmic Background Imager

The Cosmic Background Imager (CBI) is an instrument designed to make images of the cosmic microwave background radiation and to measure its statistical properties on angular scales from about 3 arc minutes to one degree (spherical harmonic scales from l ˜ 4250 down to l ˜ 400). The CBI is a 13-element interferometer mounted on a 6 meter platform operating in ten 1-GHz frequency bands from 26 GHz to 36 GHz. The instantaneous field of view of the instrument is 45 arcmin (FWHM) and its resolution ranges from 3 to 10 arcmin; larger fields can be imaged by mosaicing. At this frequency and resolution, the primary foreground is due to discrete extragalactic sources, which are monitored at the Owens Valley Radio Observatory and subtracted from the CBI visibility measurements.The instrument has been making observations since late 1999 of both primordial CMB fluctuations and the Sunyaev-Zeldovich effect in clusters of galaxies from its site at an altitude of 5080 meters near San Pedro de Atacama, in northern Chile. Observations will continue until August 2001 or later. We present preliminary results from the first few months of observations.

scholarly journals Search for Primordial Perturbations of the Universe: Observations with Ratan-600 Radio Telescope

1978 ◽  
Vol 79 ◽  
pp. 315-316
Author(s):  
Y. N. Parijskij
Keyword(s):  
Radio Telescope ◽  
Background Radiation ◽  
Low Frequency ◽  
Coma Cluster ◽  
Microwave Background ◽  
Atmospheric Noise ◽  
Upper Limit ◽  
Upper Limits ◽  
Microwave Background Radiation ◽  
The Universe

All kinds of primeval perturbations of the Universe should result in fluctuations of the microwave background radio emission. Here we report our latest upper limits to these fluctuations on scales 5′ to 3°. Using the new 600-m Soviet Radio Telescope we obtained a mean temperature profile of the region from 08h to 15h in R.A., centred at the declination of the Coma Cluster. 20 good records of this region were used in the final reduction of the data. After “normalization” of these data by filtering out low-frequency atmospheric noise and “bursts” which exceed the 4σ level we calculated an upper limit to the fluctuations of the microwave background radiation.

scholarly journals An Upper Limit to Arcminute‐Scale Anisotropy in the Cosmic Microwave Background Radiation at 142 GHz

1997 ◽  
Vol 484 (2) ◽  
pp. 523-537 ◽  
Author(s):  
S. E. Church ◽  
K. M. Ganga ◽  
P. A. R. Ade ◽  
W. L. Holzapfel ◽  
P. D. Mauskopf ◽  
...  
Keyword(s):  
Cosmic Microwave Background ◽  
Background Radiation ◽  
Cosmic Microwave Background Radiation ◽  
Microwave Background ◽  
Upper Limit ◽  
Microwave Background Radiation

Cosmological Consequences with Randers Conformal of Finsler space

2007 ◽  
Vol 3 (2) ◽  
pp. 203-211
Author(s):  
Arunesh Pandey ◽  
R K Mishra
Keyword(s):  
Background Radiation ◽  
Finsler Space ◽  
Space Time ◽  
Anisotropic Model ◽  
Microwave Background ◽  
Microwave Background Radiation

In this paper we study an anisotropic model of space – time with Finslerian metric. The observed anisotropy of the microwave background radiation is incorporated in the Finslerian metric of space time.

The experience of employment of the mathematical cartography methods in cosmology

2017 ◽  
Vol 923 (5) ◽  
pp. 7-16
Author(s):  
A.V. Kavrayskiy
Keyword(s):  
Background Radiation ◽  
Three Dimensional ◽  
Spherical Coordinates ◽  
Linear Element ◽  
Microwave Background ◽  
Euclidian Space ◽  
Microwave Background Radiation ◽  
Rectangular Coordinates ◽  
The Universe ◽  
Length Distortion

The experience of mathematical modeling of the 3D-sphere in the 4D-space and projecting it by mathematical cartography methods in the 3D-Euclidian space is presented. The problem is solved by introduction of spherical coordinates for the 3D-sphere and their transformation into the rectangular coordinates, using the mathematical cartography methods. The mathematical relationship for calculating the length distortion mp(s) of the ds linear element when projecting the 3D-sphere from the 4-dimensional Euclidian space into three-dimensional Euclidian space is derived. Numerical examples, containing the modeling of the ds small linear element by spherical coordinates of 3D-sphere, projecting this sphere into the 3D-Euclidian space and length of ds calculating by means of its projection dL and size of distortion mp(s) are solved. Based on the model of the Universe known in cosmology as the 3D-sphere, the hypothesis of connection between distortion mp(s) and the known observed effects Redshift and Microwave Background Radiation is considered.

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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