scholarly journals ON THE STATISTICAL METHODS OF THE SIGNAL SIGNIFICANCE ESTIMATION IN THE DETECTION OF THE SIGNAL FROM THE POINT SOURCES OF COSMIC RAYS

2005 ◽  
Vol 20 (29) ◽  
pp. 6765-6768
Author(s):  
A. CHILINGARIAN ◽  
G. GHARAGYOZYAN ◽  
G. HOVSEPYAN ◽  
G. KARAPETYAN
Keyword(s):  
Cosmic Rays ◽  
Point Source ◽  
Degrees Of Freedom ◽  
High Energy Physics ◽  
Simulation Models ◽  
High Energy ◽  
Point Sources ◽  
Analytical Treatment ◽  
Signal Significance ◽  
Energy Physics

The estimation of the significance of the peaks in 1 and 2-dimensional distributions is one of the most important problems in high-energy physics and astrophysics. The physical inference from low-statistics experiments usually is biased and many discoveries lack further confirmation. We analyze the significance of the experimental evidence in the on-going efforts of detecting the point source of Cosmic Rays. The analysis is carried out in the framework of two models utilizing the extremum statistics: first – using the fixed grid of celestial coordinates, and second – using the tuned grid (introducing more degrees of freedom in the search). The test distributions for the significance estimation are obtained both from simulation models and from the analytical treatment of the problem.

Beginning of High-Energy Physics in Cosmic Rays

1985 ◽  
pp. 225-237 ◽  
Author(s):  
Nicolai A. Dobrotin ◽  
Georgi T. Zatsepin ◽  
Sergei I. Nikolsky ◽  
Sergei A. Slavatinsky
Keyword(s):  
Cosmic Rays ◽  
High Energy Physics ◽  
High Energy ◽  
Energy Physics

scholarly journals γ-ray astronomy balloon results

1970 ◽  
Vol 37 ◽  
pp. 315-320 ◽  
Author(s):  
C. E. Fichtel ◽  
D. A. Kniffen ◽  
H. B. Ogelman
Keyword(s):  
Cosmic Rays ◽  
Point Source ◽  
Galactic Center ◽  
High Energy ◽  
Point Sources ◽  
Positive Evidence ◽  
Γ Ray ◽  
Balloon Experiments ◽  
Energy Processes ◽  
The Universe

The significance of high energy (≳ 30 MeV) γ-Ray astronomy and its relationship to cosmic rays and many of the high energy processes of the universe has been realized for over a decade. Through the last six to eight years, searches for point sources, mostly from balloon experiments, but also Explorers 11 and OSO-3, have been unsuccessful in clearly establishing the existence of any point source. Recently on OSO-3, Clark et al. (1968) have obtained positive evidence for a celestial γ-Ray flux which is anisotropic with a higher intensity in the direction of the galactic center region. In this talk, I wish to summarize our balloon results relating to both of these questions and indicate what we hope to accomplish with our new large γ-Ray detector over the coming months.

scholarly journals Second Chern number of a quantum-simulated non-Abelian Yang monopole

Science ◽  
2018 ◽  
Vol 360 (6396) ◽  
pp. 1429-1434 ◽  
Author(s):  
Seiji Sugawa ◽  
Francisco Salces-Carcoba ◽  
Abigail R. Perry ◽  
Yuchen Yue ◽  
I. B. Spielman
Keyword(s):  
Degrees Of Freedom ◽  
High Energy Physics ◽  
High Energy ◽  
Chern Number ◽  
Topological Order ◽  
Abelian Gauge ◽  
Simulation Based ◽  
Chern Numbers ◽  
Bose Einstein ◽  
Energy Physics

Topological order is often quantified in terms of Chern numbers, each of which classifies a topological singularity. Here, inspired by concepts from high-energy physics, we use quantum simulation based on the spin degrees of freedom of atomic Bose-Einstein condensates to characterize a singularity present in five-dimensional non-Abelian gauge theories—a Yang monopole. We quantify the monopole in terms of Chern numbers measured on enclosing manifolds: Whereas the well-known first Chern number vanishes, the second Chern number does not. By displacing the manifold, we induce and observe a topological transition, where the topology of the manifold changes to a trivial state.

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