Y. M. Cho
Seoul National University
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Featured researches published by Y. M. Cho.
Modern Physics Letters A | 2004
Y. M. Cho; M. L. Walker
We propose to resolve the controversy regarding the stability of the monopole condensation in QCD by calculating the imaginary part of the one-loop effective action perturbatively. We calculate the imaginary part perturbatively to the order g2 with two different methods, with Feynman diagram and with Schwingers method. Our result shows that with the magnetic background the effective action has no imaginary part, but with the electric background it acquires a negative imaginary part. This strongly indicates a stable monopole condensation in QCD.
European Physical Journal C | 2015
Kyoungtae Kimm; J. H. Yoon; Y. M. Cho
The latest MoEDAL experiment at LHC to detect the electroweak monopole makes the theoretical prediction of the monopole mass an urgent issue. We discuss three different ways to estimate the mass of the electroweak monopole. We first present the dimensional and scaling arguments which indicate the monopole mass to be around 4 to 10xa0TeV. To justify this we construct finite energy analytic dyon solutions which could be viewed as the regularized Cho–Maison dyon, modifying the coupling strength at short distance. Our result demonstrates that a genuine electroweak monopole whose mass scale is much smaller than the grand unification scale can exist, which can actually be detected at the present LHC.
Classical and Quantum Gravity | 2013
Y. M. Cho; Franklin H. Cho; J. H. Yoon
Viewing Einsteins theory as the gauge theory of the Lorentz group, we construct the most general vacuum connections which have vanishing curvature tensor and show that the vacuum space-time can be classified by the knot topology π3(S3) π3(S2) of π3(SO(3, 1)). With this we obtain the gauge-independent vacuum decomposition of Einsteins theory to the vacuum and gauge covariant physical parts. We discuss the physical implications of our result in quantum gravity.
International Journal of Modern Physics A | 2015
Masakatsu Kenmoku; Y. M. Cho
The superradiance phenomena of massive bosons and fermions in the Kerr spacetime are studied in the Bargmann-Wigner formulation. In case of bi-spinor, the four independent components spinors correspond to the four bosonic freedom: one scalar and three vectors uniquely. The consistent description of the Bargmann-Wigner equations between fermions and bosons shows that the superradiance of the type with positive energy
Modern Physics Letters A | 2007
Y. M. Cho; Soon-Tae Hong; Jaewan Kim; Young-Jai Park
(0<omega)
Classical and Quantum Gravity | 2017
Masakatsu Kenmoku; Y. M. Cho; Kazuyasu Shigemoto; Jong Hyuk Yoon
and negative momentum near horizon
arXiv: General Relativity and Quantum Cosmology | 1997
J. H. Yoon; S. K. Oh; C. M. Kim; Y. M. Cho
(p_{rm H}<0)
Modern Physics Letters A | 2018
Seung Hun Oh; Kyoungtae Kimm; Y. M. Cho; J. H. Yoon
is shown not to occur. On the other hand, the superradiance of the type with negative energy
EPJ Web of Conferences | 2018
Masakatsu Kenmoku; Y. M. Cho; Kazuyasu Shigemoto; Jong-Hyuk Yoon
(omega<0)
arXiv: General Relativity and Quantum Cosmology | 2016
Seung Hun Oh; Kyoungtae Kimm; Y. M. Cho; J. H. Yoon
and positive momentum near horizon