Results 1 to 10 of about 1,158,514 (269)

Diffuse Background Radiation [PDF]

The Astrophysical Journal, 1999
A new determination of the upper limit to the cosmic diffuse background radiation, at ~110 nm, of 300 photons s-1 cm-2 sr-1 nm-1, is placed in the context of diffuse background measurements across the entire electromagnetic spectrum, including new ...
Gehrels N., Longair M. S., Ressell M. T., Richard C. Henry, Vogeley M. S.   +4 more
core   +5 more sources

Decoherence in the cosmic background radiation [PDF]

Classical and Quantum Gravity, 2011
In this paper we analyze the possibility of detecting nontrivial quantum phenomena in observations of the temperature anisotropy of the cosmic background radiation (CBR), for example, if the Universe could be found in a coherent superposition of two ...
Dodelson S, Esteban Calzetta, Feynman R, Hartle J, Joos E, Kiefer C, Kiefer C, Linde A, Mariano Franco, Martineau P, Misner C, Prokopec T, Schlosshauer M, Weinberg S   +13 more
core   +7 more sources

Structures in the microwave background radiation [PDF]

Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2012
We compare the actual WMAP maps with artificial, purely statistical maps of the same harmonic content to argue that there are, with confidence level 99.7 %, ring-type structures in the observed cosmic microwave background.Comment: 4 pages, 2 ...
Meissner, K. A., Nurowski, P., Ruszczycki, B.   +2 more
core   +3 more sources

A review on natural background radiation. [PDF]

Adv Biomed Res, 2013
The world is naturally radioactive and approximately 82% of human-absorbed radiation doses, which are out of control, arise from natural sources such as cosmic, terrestrial, and exposure from inhalation or intake radiation sources. In recent years, several international studies have been carried out, which have reported different values regarding the ...
Shahbazi-Gahrouei D, Gholami M, Setayandeh S.   +2 more
europepmc   +5 more sources

Cherenkov radiation in a gravitational wave background [PDF]

Classical and Quantum Gravity, 2000
A covariant criterion for the Cherenkov radiation emission in the field of a non-linear gravitational wave is considered in the framework of exact integrable models of particle dynamics and electromagnetic wave propagation.
Alexander B Balakin, Balakin A B, Balakin A B, Calura M, Ginzburg V L, Gupta A, José P S Lemos, Kramer D, Landau L D, Landau L D, Maugin G A, Misner C W, Richard Kerner, Sbytov Yu G, Synge J L   +14 more
core   +8 more sources

Diffuse Extragalactic Background Radiation

AIP Conference Proceedings, 2008
Attenuation of high--energy gamma rays by pair--production with UV, optical and IR background photons provides a link between the history of galaxy formation and high--energy astrophysics.
Felix A. Aharonian, Frank Rieger, Joel R. Primack, Rachel S. Somerville, Rudy C. Gilmore, Werner Hofmann   +5 more
core   +4 more sources

Radiation fields in the Schwarzschild background [PDF]

Journal of Mathematical Physics, 1973
Scalar, electromagnetic, and gravitational test fields in the Schwarzschild background are examined with the help of the general retarded solution of a single master wave equation. The solution for each multipole is generated by a single arbitrary function of retarded time, the retarded multipole moment.
J. Bardeen, William H. Press
openalex   +6 more sources

Background Radiation

, 1993
We present a short overview on the extragalactic background radiation from radio to X-rays, with an eye to the relation to galaxy formation and emphasizing on astrophysical backgrounds (as opposed to cosmological). As the radio background, the wealth of data on source counts make possible reliable estimations of the contribution from extragalactic ...
G. De Zotti, A. Franceschini, L. Toffolatti, P. Mazzei, A. Da Silva   +4 more
openalex   +4 more sources

The Microwave Background Radiation [PDF]

Symposium - International Astronomical Union, 1990
We review the data on the spectrum and isotropy of the microwave background radiation and the astrophysical processes that may produce spectral distortions and anisotropies. As yet no fully satisfactory explanation has been found for the submillimeter excess observed by Matsumotoet al.(1988).
DEZOTTI G, Danese, Luigi, TOFFOLATTI L, FRANCESCHINI A.   +3 more
openaire   +3 more sources

Cosmic Background Radiation [PDF]

International Journal of Theoretical Physics, 2015
It is shown that a collection of photons with nearly the same frequency exhibits a “condensation” type of phenomenon corresponding to a peak intensity. The observed cosmic background radiation can be explained from this standpoint. We have obtained analogous results by extremization of the occupation number for photons with the use of the Lambert W ...
Valluri, Sree Ram, Sidharth, B G
openaire   +3 more sources