Results 51 to 60 of about 441,564 (317)
B polarization of cosmic background radiation from second-order scattering sources [PDF]
, 2011 B-mode polarization of the cosmic background radiation is induced from purely scalar primordial sources at second order in perturbations of the homogeneous, isotropic universe. We calculate the B-mode angular power spectrum C_l^{BB} sourced by the second-
M. Beneke, C. Fidler, K. Klingmüller
semanticscholar +1 more source
The Cosmic Background Radiation
, 1996 10 pages, postscript file available at http://www-pdg.lbl.gov/1995/contents_sports.html and also at http://pdg.lbl.gov/~smoot/rac.html, the RPP sub-page for ...
Smoot, G. F., Scott, D.
openaire +3 more sources
The Astrophysical Journal, 2023 The exquisitely measured maps of fluctuations in the cosmic microwave background (CMB) present the possibility of systematically testing the principle of statistical isotropy of the Universe. A systematic approach based on strong mathematical formulation
Dipanshu, Tarun Souradeep, Shriya Hirve
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Submillimeter Spectrum of the Cosmic Background Radiation [PDF]
Highlights of Astronomy, 1988 Recent observations of the spectrum of the 3K cosmic background radiation (CBR) indicate that the CBR spectrum is consistent with a blackbody spectrum of T = 2.74 ±0.02K (Smoot et al. 1987). These measurements, however, were carried out in the Rayleigh-Jeans part of the spectrum, while theories predict spectral distortion in the Wien part.
T. Matsumoto
semanticscholar +3 more sources
THE ESTIMATION OF COSMIC RAY COMPONENT CONTRIBUTION INTO THE TOTAL β- AND γ-BACKGROUND OF ATMOSPHERE [PDF]
Vestnik KRAUNC: Fiziko-Matematičeskie Nauki, 2017 Simulation results of characteristics of atmospheric γ- and β-radiation fields, which are produced by primary cosmic rays when overcoming an Earth’s atmospheres, with using Geant4 are presented.
A. S. Zelinskii, V. S. Yakovleva
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THE COSMIC MICROWAVE BACKGROUND RADIATION* [PDF]
Annals of the New York Academy of Sciences, 1981 Because angular anisotropies and spectral distortions of the cosmic microwave background radiation are judged to be inevitable at some level, in a realistic cosmological model, the evidence for spectral distortions and its theoretical implications are described.
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A review on natural background radiation
Advanced Biomedical Research, 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.
Daryoush Shahbazi-Gahrouei +2 more
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The Astrophysical Journal Letters, 2023 It has been pointed out that the spurious cosmic microwave background (CMB) B -mode polarization signals caused by the absorption of the CMB monopole component due to the Galactic interstellar matter, called the CMB shadow, degrade the accuracy of ...
Tamaki Murokoshi +4 more
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The Extragalactic Neutrino Background Radiations From Blazars and Cosmic Rays [PDF]
Astropart.Phys.4:343-350,1996, 1995 Blazar emission of gamma rays and cosmic ray production of gamma rays in gas-rich clusters have been proposed recently as alternative sources of the high energy extragalactic diffuse gamma ray background radiation. We show that these sources also produce a very different high energy extragalactic diffuse neutrino background radiation.
arxiv +1 more source
Modeling Background Radiation in Isotropic Cosmologies [PDF]
Gen.Rel.Grav.43:1625-1638,2011, 2011 Using explicit perturbations of isotropic cosmological models which describe simple gravitational waves, an isotropic tensor having the algebraic symmetries of the Bel-Robinson tensor is derived as a model of cosmic background gravitational radiation and this is used to provide an answer to the question: in what sense can an energy-momentum-stress ...
arxiv +1 more source