1 99 3 Background radiation
نویسندگان
چکیده
منابع مشابه
38 7 v 1 2 3 A pr 1 99 7 Effect of the 3 K background radiation on ultrahigh energy cosmic rays
In this work we reexamine the opacity of the cosmic background radiation to the propagation of extremely high energy cosmic rays. We use the continuous energy loss approximation to provide spectral modification factors for several hypothesized cosmic ray sources. Earlier problems with this approximation are resolved including the effects of resonances other than the ∆.
متن کاملar X iv : a st ro - p h / 99 04 06 2 v 1 5 A pr 1 99 9 CBR Polarization Experiments
A handful of new experiments aimed at measuring the asyet-undetected polarization of the cosmic background radiation (CBR) are described, with somewhat more detail given for three experiments with which the authors are associated.
متن کاملar X iv : h ep - p h / 99 05 33 3 v 1 1 3 M ay 1 99 9 Ultra - High Energy Cosmic Rays and Stable H - dibaryon
It is shown that instanton induced interaction between quarks produces a very deeply bound H-dibaryon with mass below 2M N , M H = 1718 MeV. Therefore the H-dibaryon is predicted to be a stable particle. The reaction of photodisintegration of H-dibaryon to 2Λ in during of its penetration into cosmic microwave background will result in a new possible cutoff in the cosmic-ray spectrum. This provi...
متن کاملar X iv : a st ro - p h / 99 07 16 8 v 1 1 3 Ju l 1 99 9 1 VACUUM ENERGY : IF NOT NOW , THEN WHEN ?
Here the various Ωi are the fractional contributions to the present critical density ρcr ≡ 3H 0/8πG. From the cosmic background radiation (CBR), we know that the spatial curvature Ωk ≡ 1 − Ωm − ΩX ± 0.2, a flat universe of critical density, dominated by non-baryonic matter and smooth energy. Inflation explains this flatness of the present universe, as a consequence of an early de Sitter phase m...
متن کاملar X iv : a st ro - p h / 99 02 30 1 v 1 2 0 Fe b 19 99 On the Stability of the CMB Autocorrelation Function on Cosmological Parameters
The properties of the Cosmic Microwave Background Radiation angular autocorrelation function in Friedman Universe with negative curvature (k = −1) are studied. The dependence of the spectral index of autocorrelation function on the density parameter of the Universe is studied numerically, taking into account the effect of geodesic mixing, occuring in k = −1 curvature Universes.
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