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1442338925
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note
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There have been claims [4] of statistically significant correlations between the arrival directions of UHECR events and certain kinds of active galactic nuclei (AGN), thought to be possible of UHE particles. However, an independent analysis did not confirm this [5]
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12
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0004185305
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December 31
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See also the New York Times, December 21, 2002
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New York Times
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17
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1442314470
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Such a source could easily over-produce protons just below the GZK cut-off
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Such a source could easily over-produce protons just below the GZK cut-off
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19
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1442265403
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note
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Note that the authors of this paper do not include bounds by RICE and AGASA on the UHE neutrino flux; these bounds are very close to the predicted fluxes
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0001545004
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This configuration seems to have first been proposed (in a different context) by M Hindmarsh and T W B Kibble, Phys. Rev. Lett. 55, 2398 (1985)
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1442265405
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X to within a factor of a few, but this does not require any more fine-tuning of model parameters than in any other explanation of the UHECR events
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Some of these 'input' FFs are still not well-determined, e.g. those starting from a b or c quark
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61
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1442314465
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note
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All fluxes are summed over particle and antiparticle, if they are distinct
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62
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1442289868
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69
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1442314469
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13 GeV are thus particularly difficult to reconcile with the experimental evidence against photons as main UHECR primaries
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1442338920
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http://owl.gsfc.nasa.gov
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