843 research outputs found
Detection prospects of the Telescope Array hotspot by space observatories
In the present-day cosmic ray data, the strongest indication of anisotropy of
the ultrahigh energy cosmic rays is the 20-degree hotspot observed by the
Telescope Array with the statistical significance of 3.4\sigma. In this work,
we study the possibility of detecting such a spot by space-based all-sky
observatories. We show that if the detected luminosity of the hotspot is
attributed to a physical effect and not a statistical fluctuation, the KLYPVE
and JEM-EUSO experiments would need to collect ~300 events with E>57 EeV in
order to detect the hotspot at the 5\sigma\ confidence level with the 68%
probability. We also study the dependence of the detection prospects on the
hotspot luminosity.Comment: 4 pages; v2: minor style changes to match the published versio
Singularities inside non-Abelian black holes
Singularities inside static spherically symmetric black holes in the SU(2)
Einstein-Yang-Mills and Einstein-Yang-Mills-dilaton theories are investigated.
Analytical formulas are presented describing oscillatory and power law metric
behavior near spacelike singularities in generic solutions.Comment: REVTeX, 9 pages, 2 EPS figures, uses epsf.st
Energy flows in the earthquake source before and after the main shock
We proceeded from general physical concepts based, on the one hand, on the
Umoff-Poynting theorem, and on the other, on the phenomenological theory of
earthquakes, and formulated the following question: What are the directions of
energy flows in the earthquake source before and after the formation of a main
rupture in it? A non-standard technique for experimental research of this issue
has been developed. The epicentral zone of the main shock is considered as a
kind of track detector, and foreshocks and aftershocks are considered as marks
(tracers) marking the propagation in the source of some factor that has energy
and stimulates the excitation of foreshocks and aftershocks in a
stressed-strained rock mass. By processing and analyzing a large volume of
observation data, it was found that over time, foreshocks, on average, approach
the epicenter of the main shock, while aftershocks, on the contrary, move away
from the epicenter. A method is indicated for verifying the result by studying
the magnitude dependence of foreshock convergence and aftershock divergence.
Keywords: foreshock, aftershock, main rupture, evolution equation, nonlinear
diffusion waves, fault length
On the proper time of the earthquake source
The concept of proper time, which is different from universal time, has been
introduced into the physics of earthquakes. The global activity of strong
earthquakes was chosen as the object of study. We consider the sequence of
earthquakes as a random process of the Poisson type. Comparatively weak
earthquakes are used as the underground clock, the ticking of which marks the
course of proper time. The Poisson distribution is compared with the
distributions for two sequences of strong earthquakes. One of the sequences is
ordered by calendar time, and the second by proper time. The result of the test
showed that the distribution of events ordered by proper time is closer to the
Poisson distribution than the distribution of events ordered by calendar time.
We explain this by non-stationarity, which is an immanent property of the
Earth's lithosphere.Comment: 9 pages, 5 figure
Power supply of autonomous systems using solar modules
The article shows the methods of constructing autonomous decentralized energy systems from solar modules. It shows the operation of up DC inverter. It demonstrates the effectiveness of DC inverters with varying structure. The system has high efficiency and low level of conductive impulse noise and at the same time the system is practically feasible. Electrical processes have been analyzed to determine the characteristics of operating modes of the main circuit elements. Recommendations on using the converters have been given
- …