Effective Action of QED in Electric Field Backgrounds II: Spatially Localized Fields (2009)
Kim, Sang Pyo, Lee, Hyun Kyu, Yoon, Yongsung
We find the Bogoliubov coefficient from the tunneling boundary condition on a charged particle coupled to a static electric field $E_0 sech^2 (z/L)$ and, using the regularization scheme in Phys. Rev....
Dilatons for Dense Hadronic Matter (2009)
The idea that the explicit breaking of scale invariance by the trace anomaly of QCD can be rephrased as a spontaneous breaking has been recently exploited to capture the low-energy strong interaction...
For a dense stellar matter, which is electrically neutral and in beta equilibrium, the electron chemical potential, mu_e, will depend nontrivially on baryonic matter density. It is generally expected...
Half-Skyrmion Hadronic Matter at High Density (2009)
The hadronic matter described as a skyrmion matter embedded in an FCC crystal is found to turn into a half-skyrmion matter with vanishing (in the chiral limit) quark condensate and {\em...
Dilatons in Hidden Local Symmetry for Hadrons in Dense Matter (2009)
With the explicit breaking of scale invariance by the trace anomaly of QCD rephrased in terms of spontaneous breaking, low-energy strong interaction dynamics of dense (and also hot) matter can be...
Schwinger Pair Production at Finite Temperature in QED (2008)
Kim, Sang Pyo, Lee, Hyun Kyu, Yoon, Yongsung
We use the evolution operator method to find the Schwinger pair-production rate at finite temperature in scalar and spinor QED by counting the vacuum production, the induced production and the...
Quark number Susceptibility and Phase Transition in hQCD Models (2008)
Jo, Kwanghyun, Kim, Youngman, Lee, Hyun Kyu, Sin, Sang-Jin
We study the quark number susceptibility, an indicator of QCD phase transition, in the hard wall and soft wall models of hQCD. We find that the susceptibilities in both models are the same, jumping...
Effective Action of QED in Electric Field Backgrounds (2008)
Kim, Sang Pyo, Lee, Hyun Kyu, Yoon, Yongsung
We use the evolution operator method to find the one-loop effective action of scalar and spinor QED in electric field backgrounds in terms of the Bogoliubov coefficient between the ingoing and the...
Effective Action and Schwinger Pair Production in Scalar QED (2008)
Some astrophysical objects are supposed to have very strong electromagnetic fields above the critical strength. Quantum fluctuations due to strong electromagnetic fields modify the Maxwell theory and...
Consequences of the partial restoration of chiral symmetry in AdS/QCD (2008)
Chiral symmetry is an essential concept in understanding QCD at low energy. We treat the chiral condensate, which measures the spontaneous breaking of chiral symmetry, as a free parameter to...
Electron-Neutrino Degeneracy And Primordial Nucleosynthesis (2007)
Jong Bock, Joon Ha Kim, Hyun Kyu Lee
We discuss the possible ranges of electron neutrino degeneracy which is consistent with the inferred primordial abundances of the light elements. It is found that the electron neutrino degeneracy,...
Fermion Production in Strong Magnetic Field and its Astrophysical Implications (2007)
We calculate the effective potential of a strong magnetic field induced by fermions with anomalous magnetic moments which couple to the electromagnetic field in the form of the Pauli interaction. For...
Schwinger Pair Production at Finite Temperature in Scalar QED (2007)
In scalar QED we study the Schwinger pair production from an initial ensemble of charged bosons when an electric field is turned on for a finite period together with or without a constant magnetic...
Effective Potential for Uniform Magnetic Fields through Pauli Interaction (2006)
We have calculated the explicit form of the real and imaginary parts of the effective potential for uniform magnetic fields which interact with spin-1/2 fermions through the Pauli interaction. It is...
Levinson, Amir, Lee, Hyun Kyu, Regimbau, Tania, Punturo, Michele, Harry, Gregory M.
Gamma-ray bursts are believed to originate in core-collapse of massive stars. This produces an active nucleus containing a rapidly rotating Kerr black hole surrounded by a uniformly magnetized torus...
Vector susceptibility and chiral phase transition in AdS/QCD Models (2006)
Jo, Kwanghyun, Kim, Youngman, Lee, Hyun Kyu, Sin, Sang-Jin
Withdrawn: replaced by e-Print: arXiv:0810.0063 [hep-ph]
Poynting Flux out of Rotating Black Hole and Accretion Flow through Force-Free Magnetosphere (2006)
The basic features of the Poynting flux from the horizon and the ergosphere of a black hole and from the accreting flow onto a black hole are discussed for the force-free magnetosphere. The accretion...
Relativistic Electrodynamics of Spinning Compact Objects (2006)
Kim, Hongsu, Lee, Hyung Mok, Lee, Chul H., Lee, Hyun Kyu
A theoretical study of some electrodynamic features of a region close to a {\it slowly-rotating} magnetized relativistic star is performed. To be a little more specific, based on the...
Production of Neutral Fermion in Linear Magnetic Field through Pauli Interaction (2005)
We calculate the production rate of neutral fermions in linear magnetic fields through the Pauli interaction. It is found that the production rate is exponentially decreasing function with respect to...
Pulsar Magnetosphere : A General Relativistic Treatment (2004)
Kim, Hongsu, Lee, Hyung Mok, Lee, Chul H., Lee, Hyun Kyu
A fully general relativistic description of the pulsar magnetosphere is provided. To be more concrete, a study of the pulsar magnetosphere is performed in the context of general relativistic...
Representation Mixing and Exotic Baryons in the Skyrme Model (2004)
We study the effect of representation mixing in the SU(3) Skyme model by diagonalizing exactly the representation-dependent part. It is observed that even without the next-to-leading order symmetry...
Levinson, Amir, Lee, Hyun Kyu, Regimbau, Tania, Punturo, Michele, Harry, Gregory M.
Gamma-ray bursts are believed to originate in core-collapse of massive stars. This produces an active nucleus containing a rapidly rotating Kerr black hole surrounded by a uniformly magnetized torus...
Levinson, Amir, Lee, Hyun Kyu, Regimbau, Tania, Punturo, Michele, Harry, Gregory M.
Gamma-ray bursts are believed to originate in core-collapse of massive stars. This produces an active nucleus containing a rapidly rotating Kerr black hole surrounded by a uniformly magnetized torus...
Line-broadening in gravitational radiation from gamma-ray burst-supernovae (2004)
Lee, Hyun Kyu, Lee, Chul H., Kim, Hongsu
Core-collapse in massive stars is believed to produce a rapidly spinning black hole surrounded by a compact disk or torus. This forms an energetic MeV-nucleus inside a remnant He-core, powered by...
Two Dimensional Poynting Flux Dominated Flow onto a Schwarzschild Black Hole (2004)
We discuss the dynamics of the accretion flow onto a black hole driven by Poynting flux in a simplified model of a two-dimensional accretion disk. In this simplified model, the condition of the...
Charges and Magnetic Fields of the Slowly-rotating Neutron Stars (2003)
Kim, Hongsu, Lee, Hyung Mok, Lee, Chul H., Lee, Hyun Kyu
In association with the Goldreich-Julian's magnetic braking mechanism to explain the luminosity of radio pulsars as a result of their spin-down, it is of some interest to explore how much of magnetic...
Levinson, Amir, Lee, Hyun Kyu, Regimbau, Tania, Punturo, Michele, Harry, Gregory M.
Gamma-ray bursts are believed to originate in core-collapse of massive stars. This produces an active nucleus containing a rapidly rotating Kerr black hole surrounded by a uniformly magnetized torus...
It has been suggested that the overdense region as a result of inhomogeneities in the early Universe would have undergone a collapse into the primordial black holes(PBH). In this work, we discuss a...
Magnetic Alignment Process : A New Mechanism for Extracting Energy from Rotating Black Holes (2002)
Kim, Hongsu, Lee, Hyun Kyu, Lee, Chul H.
As a complementary or companion process to the Blandford-Znajek mechanism for the rotational energy extraction from a Kerr black hole to serve as a viable model for the central engine of quasar, AGN...
Radial equation for an accretion flow driven by Poynting flux (2002)
Using a toy model of a two dimensional accretion disk, we discuss further the radial equation of the accretion flow dominated by the Poynting flux. Assuming the force-free condition is valid around...
Evolution of a black hole at the center of GRB (2002)
Using a simplified model of a black hole-accretion disk system which is dominated by Poynting flux, the evolution of the central black hole which is supposed to be powering GRB is discussed. It is...
Toy model for a two-dimensional accretion disk dominated by Poynting flux (2001)
We discuss the effect of the Poynting flow on the magnetically dominated thin accretion disk, which is simplified to a two-dimensional disk on the equatorial plane. It is shown in the relativistic...
Znajek-Damour Horizon Boundary Conditions with Born-Infeld Electrodynamics (2000)
Kim, Hongsu, Lee, Hyun Kyu, Lee, Chul H.
In this work, the interaction of electromagnetic fields with a rotating (Kerr) black hole is explored in the context of Born-Infeld (BI) theory of electromagnetism instead of standard Maxwell theory...
Non-vanishing Magnetic Flux through the Slightly-charged Kerr Black Hole (2000)
Kim, Hongsu, Lee, Chul Hoon, Lee, Hyun Kyu
In association with the Blanford-Znajek mechanism for rotational energy extraction from Kerr black holes, it is of some interest to explore how much of magnetic flux can actually penetrate the...
Electric Charge and Magnetic Flux on Rotating Black Holes in a Force-Free Magnetosphere (2000)
The electric charge on rotating black holes is calculated to be ~ BJ in the force-free configuration of Ghosh (2000), with a horizon flux of ~ BM^2. This charge is gravitationally weak for B ~...
Evolution of a Rotating Black Hole with a Magnetized Accretion Disk (2000)
The effect of an accretion disk on the Blandford-Znajek process and the evolution of a black hole are discussed using a simplified system for the black hole - accretion disk in which the accretion...
On Companion-Induced Off-Center Supernova-Like Explosions (2000)
Lee, Chang-Hwan, Yi, Insu, Lee, Hyun Kyu
We suggest that a neutron star with a strong magnetic field, spiraling into the envelope of a companion star, can generate a ``companion induced SN-like off-center explosion". The strongly magnetized...
Issues in the Blandford-Znajek Process for GRB Inner Engine (1999)
Several issues regarding the Blandford-Znajek process are discussed to demonstrate that it can be an effective mechanism for powering the gamma ray bursts. Using a simple circuit analysis it is...
Blandford-Znajek process as a gamma ray burst central engine (1999)
We investigate the possibility that gamma-ray bursts are powered by a central engine consisting of a black hole with an external magnetic field supported by a surrounding disk or torus. The...
Renormalization Group Analysis of \rho-Meson Properties at Finite Density (1999)
We calculate the density dependence of the $\rho$-meson mass and coupling constant($g_{\rho NN}$) for $\rho$-nucleon-nucleon vertex at one loop using the lagrangian where the $\rho$-meson is included...
Can precessing jets explain the light curves of Gamma-ray Bursts? (1998)
Zwart, Simon Portegies, Lee, Chang-Hwan, Lee, Hyun Kyu
We present a phenomenological model to explain the light curves of gamma-ray bursts. In the model a black hole is orbited by a precessing accretion disc which is fed by a neutron star. Gamma-rays are...
Kim, Jong Bock, Kim, Joon Ha, Lee, Hyun Kyu
Recent measurements of deuterium abundances from QSO absorption spectra show two conflicting numbers, which differ by an order of magnitude. Allowing the neutrino degeneracy together with...
Electron-Neutrino Degeneracy and Primordial Nucleosynthesis (1997)
Kim, Jong Bock, Kim, Joon Ha, Lee, Hyun Kyu
We discuss the possible ranges of electron neutrino degeneracy which is consistent with the inferred primordial abundances of the light elements. It is found that the electron neutrino degeneracy,...
Baryon Density and the Dilated Chiral Quark Model (1996)
We calculate perturbatively the effect of density on hadronic properties using the chiral quark model implemented by the QCD trace anomaly to see the possibility of constructing Lorentz invariant...
Finite-Temperature Corrections in the Dilated Chiral Quark Model (1995)
Kim, Youngman, Lee, Hyun Kyu, Rho, Mannque
We calculate the finite-temperature corrections in the dilated chiral quark model using the effective potential formalism. Assuming that the dilaton limit is applicable at some short length scale, we...
Renormalization-Group Flow Analysis of Meson Condensations in Dense Matter (1994)
Lee, Hyun Kyu, Rho, Mannque, Sin, Sang-Jin
We present a renormalization-group (RG) flow argument for s-wave kaon condensation in dense nuclear-star matter predicted in chiral perturbation theory. It is shown that it is the {\it relevant} mass...
Characteristics of QCD Phase Transitions in an Extended Skyrme Model on $S^3$ (1994)
Kim, Joon Ha, Yee, Sooman, Lee, Hyun Kyu
We study the characteristics of the QCD phase transitions in dense hadronic matter using the Skyrme model constructed on S^3. We find numerically the localized solutions on $S^3$ using the extended...
Static Solution of the General Relativistic Nonlinear $\sigma$-Model Equation (1994)
Lee, Chul H., Kim, Joon Ha, Lee, Hyun Kyu
The nonlinear $\sigma$-model is considered to be useful in describing hadrons (Skyrmions) in low energy hadron physics and the approximate behavior of the global texture. Here we investigate the...
Vanishing of Nonabelian Berry Phases in Heavy Solitonic Baryons (1993)
In this article, we show -- using a reasoning applicable to both the excitation spectrum in the chiral bag model and the hyperfine structure of diatomic molecules -- that the generic form of a non-...
Rotation Symmetry and Nonabelian Berry Potential (1992)
We study the role of rotational symmetry in the systems where nonabelian Berry potentials emerge as a result of integrating out fast degrees of freedom. The conserved angular momentum is constructed...