نتایج جستجو برای: قطع gzk
تعداد نتایج: 7122 فیلتر نتایج به سال:
Broad arguments indicate that quantum gravity should have a minimal length scale. In this paper, we construct minimum model by generalizing the time-position and energy–momentum operators while keeping much of structure mechanics relativity intact: standard position-momentum commutator, special relativistic time-position, relationships all remain same. Since for modified same, retain form Loren...
ملخص: في ظل ارتكاب جرائم الحرب، الانتهاكات المتكررة للقانون الدولي الإنساني، ورفض تطبيق القرارات الأممية والدولية، وفوق كل ما سبق يتمتع الاحتلال الإسرائيلي بدعم مستمر وحصانة استراتيجية توفرها الدول الغربية بقيادة الولايات المتحدة الامريكية؛ ومع دوام حالة الإفلات من العقاب؛ يقوم متى شاء بضرب أي منطقة فلسطينية وفق سياسات الفصل العنصري وتهويد المسجد الأقصى ومدينة القدس؛ بل قطع أمل دعاة السلام خلال...
We show how the argument exploited by Galaverni & Sigl in Phys. Rev. Lett., 100, 021102 (2008) (see also arXiv:0708.1737) [1] to constrain Lorentz invariance violation (LV) using Ultra-High-Energy photon non observation by the AUGER experiment, can be extended to QED with Planck-suppressed LV (at order O(E/M) and O(E/M)). While the original constraints given by Galaverni & Sigl [1] happen to be...
Astrophysical neutrinos at EeV energies promise to be an interesting source for astrophysics and particle physics. Detecting the predicted cosmogenic (Greisen-ZatsepinKusmin, “GZK”) neutrinos at 10 10 eV would test models of cosmic ray production at these energies and probe particle physics at ∼100 TeV center-of-mass energy. IceCube may be able to detect ∼10 GZK events per year with an extensio...
The High Resolution Fly's Eye (HiRes) experiment has observed the Greisen-Zatsepin-Kuzmin suppression (called the GZK cutoff) with a statistical significance of five standard deviations. HiRes' measurement of the flux of ultrahigh energy cosmic rays shows a sharp suppression at an energy of 6 x 10(19) eV, consistent with the expected cutoff energy. We observe the ankle of the cosmic-ray energy ...
Several lines of evidence point to a relationship between gamma-ray bursts (GRBs) and the high mass stars that explode as supernovae. Arguments that GRB sources accelerate cosmic rays (CRs) are summarized. High-energy neutrino detection from individual GRBs would mean that they are hadronically dominated, that is, that the amount of energy deposited in the form of nonthermal hadrons in GRB blas...
We report on the current construction status of the IceCube high energy neutrino observatory and possible future construction plans. With the completion of the fourth construction season in Feb. 2008, the observatory is now instrumenting half a cubic kilometer of ice, greatly increasing the horizon for high energy neutrino detection. We briefly describe physics topics related to cosmology, such...
The existence of a fundamental length (or fundamental time) has been conjecture in many contexts. Here one discusses some consequences of a fundamental constant of this type, which emerges as a consequence of deformation-stability considerations leading to a noncommutative space-time structure. This mathematically well defined structure is sufficiently constrained to allow for unambiguous exper...
We discuss whether the NuTeV anomaly can be explained, compatibly with all other data, by QCD effects (maybe, if the strange sea is asymmetric, or there is a tiny violation of isospin), new physics in propagators or couplings of the vector bosons (not really), loops of supersymmetric particles (no), dimension six operators (yes, for one specific SU(2)L-invariant operator), leptoquarks (not in a...
Modelling space-time foam using a non-critical Liouville-string model for the quantum fluctuations of D-branes with recoil, we discuss the issues of momentum and energy conservation in particle propagation and interactions. We argue that momentum should be conserved exactly during propagation and on the average during interactions, but that energy is conserved only on the average during propaga...
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