64166550
EUDG IMPLEMENTATION IN KOREA FOR HIGH-ENERGY PHYSICS STUDY
Researchers in high energy physics (HEP) have had difficulties securing enough computing powers to store and process tons of data produced from accelerators. In addition, the fact that the researchers are distributed over the world compromises the efficiency of the high energy physics researches which are cooperative in nature. Grid, the so-called next generation Internet, is expected to overcome these difficulties. By integrating computing resources distributed over the world, Grid will allow increased accessibility to data, necessary computing powers, and storage space. In this paper, we describe the initial implementation experiences of HEP Data Grid in Korea using European Data Grid (EUDG) software developed by CERN.
122236431
A telescope for observation from space of extreme lightnings in the upper atmosphere
A new type of telescope with a wide field-of-view and functions of fast zoom-in has been introduced. Two kinds of MEMS (Micro-Electro-Mechanical Systems) micromirrors, digital and analog, are used for reflectors of the telescope, placed at different focal lengths. We apply this technology to the observation from space of TLE (Transient Luminous Events), extremely large transient sparks occurring at the upper atmosphere. TLE are one type of important backgrounds to be understood for future space observation of UHECR (Ultra-High Energy Cosmic Rays). The launch of the payload carried by a Russian microsatellite is foreseen in the middle of 2008.
19026527
Axionic Extensions of the Standard Model
After a brief review of the axion solution of the strong CP problem, its supersymmetric extension and the superstring axion are discussed. I also present one interesting cosmological scenario, the axino-gravitino cosmology, for the large scale structure of the universe.
118877558
QCD axion and quintessential axion
The axion solution of the strong CP problem is reviewed together with the other strong CP solutions. We also point out the quintessential axion(quintaxion) whose potential can be extremely flat due to the tiny ratio of the hidden sector quark mass and the intermediate hidden sector scale. The quintaxion candidates are supposed to be the string theory axions, the model independent or the model dependent axions.
119259613
Cosmological constant is probably adjustable in brane worlds
In the brane world scenario, possessing the self-tuning property of the cosmological constant, we study the probability amplitude for an initial state of the Universe to transform to final states with some curvatures. In the Kim, Kyae, and Lee model, there exists a finite range of parameters such that the transition amplitude to a near flat universe is exponentially dominated by the smallness of curvature, $\ensuremath{\gtrsim}{e}^{\mathrm{positive}\text{ }\mathrm{number}/{\overline{\ensuremath{\Lambda}}}^{2}}$, i.e., it is dominated by an almost flat universe of $|\overline{\ensuremath{\Lambda}}|lϵ$.
123004654
Light Pseudoscalars, Particle Physics and Cosmology
Abstract We review physics of light pseudoscalars (axions, majorons and familons) and their effects in cosmology. The axions which solve the strong CP problem play important roles in astrophysics and cosmology. The allowed band of the axion scale 10 8 GeV ≲ F a ≲ 10 12 GeV may be the next high energy scale. We discuss the ideas, techniques and phenomenologies leading to this interesting mass scale. Majorons and familons are also discussed.
118455901
CMB data constraint on self-annihilation of dark matter particles
Recently, self‐annihilation of dark matter particles is proposed to explain the “WMAP Haze” and excess of energetic positrons and electrons in ATIC and PAMELA results. If self‐annihilation of dark matter occurs around the recombination of cosmic plasma, energy release from self‐annihilation of dark matter delays the recombination, and hence affects CMB anisotropy. By using the recent CMB data, we have investigated the self‐annihilation of dark matter particles. In this investigation, we do not find statistically significant evidence, and impose an upper bound on 〈σν〉/mϰ.The upcoming data from Planck surveyor and the Fermi Gamma‐ray telescope will allow us to break some of parameter degeneracy and improve constraints on self‐annihilation of dark matter particles.