Jaedong Choi

Korea Air Force Academy, Seishū, Chungcheongbuk-do, South Korea

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Publications (10)7.19 Total impact

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    Jaedong Choi
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    ABSTRACT: We study the GMGHS spacetimes to analyze the evolution of the anisotropy universe, which can be treated as a doubly warped products manifold possessing warping functions (or scale factor) having the Kantowski-Sachs solution which represents homogeneous but anisotropically expanding(contracting) cosmology. We investigate the curvature associated with three phases in the evolution of the universe.
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    Jaedong Choi
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    ABSTRACT: In the framework of Lorentzian multiply warped products we study the magnetically charged Gibbons-Maeda-Garfinkle-Horowitz-Strominger (GMGHS) interior spacetime in the string frame. We also investigate geodesic motion in various hypersurfaces, and compare their solutions of geodesic equations with the ones obtained in the Einstein frame.
    Modern Physics Letters A 07/2014; 29(36). DOI:10.1142/S0217732314501983 · 1.34 Impact Factor
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    Yong-Wan Kim, Jaedong Choi, Young-Jai Park
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    ABSTRACT: We obtain a (5+1) dimensional global flat embedding of the Gibbons-Maeda-Garfinkle-Horowitz-Strominger spacetime in Einstein frame, and a (5+2) dimensional global flat embedding in string frame. We also find the local free-fall temperatures for freely falling observers in each frames compared with the local temperatures for fiducial observers.
  • Jaedong Choi, Yong-Wan Kim, Young-Jai Park
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    ABSTRACT: In the framework of Lorentzian multiply warped products we study the Gibbons-Maeda-Garfinkle-Horowitz-Strominger (GMGHS) spacetime near hypersurfaces in the interior of the event horizon. We also investigate the geodesic motion in hypersurfaces.
    Modern Physics Letters A 06/2013; 28(32). DOI:10.1142/S0217732313501435 · 1.34 Impact Factor
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    Soon-Tae Hong, Jaedong Choi, Young-Jai Park
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    ABSTRACT: We study a multiply warped product manifold associated with the Reissner–Nordstrom–AdS metric to investigate the physical properties inside the black hole event horizons. Our results include various limiting geometries of the RN, Schwarzschild–AdS and Schwarzschild spacetimes, through the successive truncation procedure of parameters in the original curved space.
    Nonlinear Analysis 11/2005; 63(5). DOI:10.1016/j.na.2005.03.010 · 1.61 Impact Factor
  • Soon-Tae Hong, Jaedong Choi, Young-Jai Park
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    ABSTRACT: We study a multiply warped product manifold associated with the Reissner-Nordstrom-AdS metric to investigate the physical properties inside the black hole event horizons. Our results include various limiting geometries of the RN, Schwarzschild--AdS and Schwarzschild space-times, through the successive truncation procedure of parameters in the original curved space.
  • Soon-Tae Hong, Jaedong Choi, Young-Jai Park
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    ABSTRACT: Exploiting a multiply warped products manifold scheme, we study the interior solutions of the (2 + 1) Banados-Teitelboim-Zanelli black holes and the exterior solutions of the (2 + 1) de Sitter black holes.
    General Relativity and Gravitation 11/2003; 35(12):2105-2116. DOI:10.1023/A:1027341404877 · 1.73 Impact Factor
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    Jaedong Choi, Soon-Tae Hong
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    ABSTRACT: In the framework of Lorentzian warped products, we study the Friedmann-Robertson-Walker cosmological model to investigate non-smooth curvatures associated with multiple discontinuities involved in the evolution of the universe. In particular we analyze non-smooth features of the spatially flat Friedmann-Robertson-Walker universe by introducing double discontinuities occurred at the radiation-matter and matter-lambda phase transitions in astrophysical phenomenology. Comment: 10 pages
    Journal of Mathematical Physics 08/2003; DOI:10.1063/1.1637714 · 1.18 Impact Factor
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    Soon-Tae Hong, Jaedong Choi, Young-Jai Park
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    ABSTRACT: Exploiting a multiply warped product manifold scheme, we study the interior solutions of the Banados-Teitelboim-Zanelli black holes and the exterior solutions of the de Sitter black holes in the (2+1) dimensions.
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    Soon-Tae Hong, Jaedong Choi, Young-Jai Park
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    ABSTRACT: We study a multiply warped products manifold associated with the Reissner-Nordstrom metric to investigate the physical properties inside the black hole event horizons. It is shown that, different from the uncharged Schwarzschild metric, the Ricci curvature components inside the Reissner-Nordstrom black hole horizons are nonvanishing, while the Einstein scalar curvature vanishes even in the interior of the charged metric. Introducing a perfect fluid inside the Reissor-Nordstrom black hole, it is also shown that the charge plays effective roles of decreasing the mass-energy density and the pressure of the fluid inside the black hole.