نتایج جستجو برای: natural background radiation
تعداد نتایج: 1502475 فیلتر نتایج به سال:
The calculations of Guang-Wen Ma’s recent Letter [Phys.Lett. A239, (1998) 209] contain an easily detectable error which makes his conclusions irrelevant. ∗E-mail: [email protected]
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. This neutrino background may be detected by the new generati...
An epoch of accelerated expansion, or inflation, in the early universe solves several cosmological problems. While there are many models of inflation only recently has it become possible to discriminate between some of the models using observations of the cosmic microwave background radiation and large-scale structure. In this talk, we discuss inflation and its observational consequences, and t...
I review the discovery of the temperature fluctuations in the cosmic microwave background radiation. The underlying theory and the implications for cosmology are reviewed, and I describe the prospects for future progress.
S INCE 1920 there has been a marke(l increase in the recorded incidence of leukemia and the lymphomas. At the same time, exposure to iomiizing radiation has been shown to increase the frequency of these diseases. Consequently there is now mounting concern about tile gradually rising level of background radiation in the environment. In this paper, the incidence of leukemia and the Ivniphomnas in...
We would like to thank Ferlazzo and Foray (1) for their very important comments and suggestions. We will keep in mind that “scientists should take particular care to justify their methodology and moderate their conclusions.” One concern of Ferlazzo and Foray (1) is that our control experiment entailed exposure to the ground radiation of Japan, rather than to a high natural radiation background ...
Using data collected at the Pierre Auger Observatory during the past 3.7 years, we demonstrated a correlation between the arrival directions of cosmic rays with energy above 6 x 10(19) electron volts and the positions of active galactic nuclei (AGN) lying within approximately 75 megaparsecs. We rejected the hypothesis of an isotropic distribution of these cosmic rays with at least a 99% confide...
The growth of small perturbations and the temperature correlation function of cosmic background radiation induced by the perturbations in the isotropic and homogeneous universe with arbitrary spatial curvature, filled with nonrelativistic and so-called string-like matter is calculated. It is shown that both magnitudes are insensitive to the eventual existence of the string-like matter in the un...
We investigate the statistical anisotropy and gaussianity of temperature fluctuations of Cosmic Microwave Background (CMB) radiation data from the Wilkinson Microwave Anisotropy Probe survey, using the Multifractal Detrended Fluctuation Analysis, Rescaled Range, and Scaled Windowed Variance methods. Multifractal Detrended Fluctuation Analysis shows that CMB fluctuations has a long-range correla...
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