It is well-known that the universe opaque to propagation of Ultra-High-Energy Cosmic Rays (UHECRs) since these particles dissipate energy during their interacting with background fields present in universe, mainly Microwave Background (CMB) so-called GZK cut-off phenomenon. Some experimental evidence seems hint at possibility a dilation predicted opacity sphere. kinematical perturbations caused...

نفذت تجربة حقلية في الموسمين الشتويين 2020- 2021 و 2021- 2022 احدى المزارع الخاصة قرية بنات الحسن جنوب شرق مدينة سامراء تربة جبسيه. تضمنت التجربة 180 وحدة تجريبية بواقع 45 معاملة بثلاث مكررات ناتجة من تداخل السماد المركب بأربعة تراكيز 0 ، 320 640, كغم . هكتار-1 والحامض الأميني الهستدين 50 100 ملغم .لتر-1 وخمسة تراكيب وراثية المحلي سخا8, سخا10, سخا12, جيزة8 هدفت هذه الدراسة الى تقدير مقاييس النم...

It has been suggested that the characteristic energy of string models may be considerably lower than the observed Planck mass (≈ 10GeV). In such schemes, the unification of interactions takes place around the string scale, perhaps as low as a few tens of TeV. Consequently, at energies above the string scale, neutrinos acquire interactions comparable in strength to strong interactions. While the...

In this paper we will discuss the problem of Ultra High Energy Cosmic Rays (UHECR) and show that the idea of a Single Source Model established by Erlykin and Wolfendale (1997) to explain the features seen in cosmic ray energy spectra around the 1015 eV region can be successfully applied also for the much higher energies. The propagation of UHECR (of energies higher than 1019 eV) in extragalacti...

Using data from more than ten-years of observations with the Akeno Giant Air Shower Array (AGASA), we published a result that the energy spectrum of ultrahigh energy cosmic rays extends beyond the cutoff energy predicted by Greisen [1], and Zatsepin and Kuzmin [2]. In this paper, we reevaluate the energy determination method used for AGASA events with respect to the lateral distribution of show...

Rotating black holes can power the most extreme non-thermal transient sources. They have a long-duration viscous time-scale of spin-down and produce non-thermal emissions along their spin-axis, powered by a relativistic capillary effect. We report on the discovery of exponential decay in BATSE light curves of long GRBs by matched filtering, consistent with a viscous time-scale, and identify UHE...

We present a method to constrain the injection spectrum of ultrahigh energy cosmic rays (CRs) from supposedly identified extragalactic sources, which can be applied even when only one or two events per source are observed, and is more efficient than a simple fit of the CR energy spectrum including only the contribution of all identified sources. The method is based on the analysis of the probab...

South Pole ice is predicted to be the best medium for acoustic neutrino detection. Moreover, ice is the only medium in which all three dense-medium detection methods (optical, radio, and acoustic) can be used to monitor the same interaction volume. Events detected in coincidence between two methods allow significant background rejection confidence, which is necessary to study rare GZK neutrinos...