206 citations · 1.1k across the 39 of their papers we have counts for
26 papers · 1 filter
Zero-Mass Rotating Spacetimes in Four-Dimensional Horava Gravity
Mu-In Park, Hyung Won Lee
We study a particular exact solution for rotating spacetimes in four-dimensional Horava gravity, which has been proposed as a renormalizable gravity model without the ghost problem…
Schwinger Pair Production in Pulsed Electric Fields
Sang Pyo Kim, Hyung Won Lee, Remo Ruffini
We numerically investigate the temporal behavior and the structure of longitudinal momentum spectrum and the field polarity effect on pair production in pulsed electric fields in s…
Future cosmological evolution in gravity using two equations of state parameters
Hyung Won Lee, Kyoung Yee Kim, Yun Soo Myung
We investigate the issues of future oscillations around the phantom divide for gravity. For this purpose, we introduce two types of energy density and pressure arisen from t…
Equations of State in the Brans-Dicke cosmology
Hyung Won Lee, Kyoung Yee Kim, Yun Soo Myung
We investigate the Brans-Dicke (BD) theory with the potential as cosmological model to explain the present accelerating universe. In this work, we consider the BD field as a perfec…
Slowly rotating black holes in the Horava-Lifshitz gravity
Hyung Won Lee, Yong-Wan Kim, Yun Soo Myung
We investigate slowly rotating black holes in the Hořava-Lifshitz (HL) gravity. For and , we find a slowly rotating black hole of the Kehagias-Sfetsos solution in asym…
Entropic force versus temperature force
Yun Soo Myung, Hyung Won Lee, Yong-Wan Kim
We introduce the cavity enclosing a source mass to define the temperature force. Starting with the Tolman temperature in the stationary spacetime, we find a non-relativistic te…
Extremal black holes in the Hořava-Lifshitz gravity
Hyung Won Lee, Yong-Wan Kim, Yun Soo Myung
We study the near-horizon geometry of extremal black holes in the Hořava-Lifshitz gravity with a flow parameter . For , near-horizon geometry of extremal black hole…
Nonpropagation of scalar in the deformed Hořava-Lifshitz gravity
Yong-Wan Kim, Hyung Won Lee, Yun Soo Myung
We study the propagation of a scalar, the trace of in the deformed Hořava-Lifshitz gravity with coupling constant . It turns out that this scalar is not a propagating m…
Entropy of black holes in topologically massive gravity
Yun Soo Myung, Hyung Won Lee, Yong-Wan Kim
We study the issue of black hole entropy in the topologically massive gravity. Assuming that the presence of gravitational Chern-Simons term with the coupling does modify the…
Quasinormal modes for topologically massive black hole
Hyung Won Lee, Yong-Wan Kim, Yun Soo Myung
We calculate quasinormal modes of a massive scalar perturbation on the topologically massive black hole (CS-BTZ black hole). The chiral point of corresponds to a newly ex…
Second-order corrections to slow-roll inflation in the brane cosmology
Kyung Hee Kim, Hyung Won Lee, Yun Soo Myung
We calculate the power spectrum, spectral index, and running spectral index for the RS-II brane inflation in the high-energy regime using the slow-roll expansion. There exist sever…
Second-order corrections to noncommutative spacetime inflation
Hungsoo Kim, Gil Sang Lee, Hyung Won Lee +1
We investigate how the uncertainty of noncommutative spacetime affects on inflation. For this purpose, the noncommutative parameter is taken to be a zeroth order slow-roll pa…
Dynamical Behavior of dilaton in de Sitter space
H. W. Lee, Y. S. Myung
We study the dynamical behavior of the dilaton in the background of three-dimensional Kerr-de Sitter space which is inspired from the low-energy string effective action. The pertur…
Nonpropagation of tachyon on the BTZ black hole in type 0B string theory
H. W. Lee, Y. S. Myung, Jin Young Kim
We obtain the BTZ black hole (AdSS) as a non-dilatonic solution from type 0B string theory. Analyzing the perturbation around this black hole background, we show tha…
Tachyon and fixed scalars of D5-D1 black hole in type 0B string theory
Y. S. Myung, H. W. Lee, Jin Young Kim
In the type 0B string theory, we discuss the role of tachyon() and fixed scalars(). The issue is to explain the difference between tachyon and fixed scalars in the D$5_{\pm…
Gauge bosons and the AdS_3/LCFT_2 correspondence
Y. S. Myung, H. W. Lee
We study the relationship between the gauge boson coupled to spin 2 operator and the singleton in three-dimensional anti-de Sitter space(AdS). The singleton can be expressed in…
6D black string as a model of the AdS/CFT correspondence
Y. S. Myung, N. J. Kim, H. W. Lee
We discuss the entropy for the extremal BTZ black hole and the extremal EBTZ black hole. The EBTZ black hole means the BTZ black hole embedded in a five-dimensional(5D) black hole.…
Probing the BTZ black hole with test fields
H. W. Lee, N. J. Kim, Y. S. Myung
We introduce a set of scalar fields as test fields to study the dynamical behaviors of the BTZ (Banados-Teitelboim-Zanelli) black hole. These include minimally coupled scalar, conf…
Dynamical Behavior of the BTZ Black Hole
H. W. Lee, N. J. Kim, Y. S. Myung
We study the dynamical behavior of the BTZ (Banados-Teitelboim-Zanelli) black hole with the low-energy string effective action. The perturbation analysis around the BTZ black hole…
The role of fixed scalars in scattering off a 5D black hole
H. W. Lee, Y. S. Myung, Jin Young Kim
We discuss the role of fixed scalars() in scattering off a five-dimensional balck hole. The issue is to explain the disagreement of the greybody factor for between the sem…
Absorption of fixed scalar in scattering off 4D N=4 black holes
H. W. Lee, Y. S. Myung, Jin Young Kim
We perform the perturbation analysis of the black holes in the 4D, N=4 supergravity. Analysis around the black holes reveals a complicated mixing between the dilaton and other fiel…
Negative modes in the four-dimensional stringy wormholes
Jin Young Kim, H. W. Lee, Y. S. Myung
We study the Giddings-Strominger wormholes in string theories. We found negative modes among O(4)-symmetric fluctuations about the non-singular wormhole background. Hence the strin…
Classical instanton and wormhole solutions of Type IIB string theory
Jin Young Kim, H. W. Lee, Y. S. Myung
We study D-brane in type IIB superstring theory. In addition to RR instanton, we obtain the RR charged wormhole solution in the Einstein frame. This corresponds to the ten-d…
Propagating waves in an extremal black string
H. W. Lee, Y. S. Myung, Jin Young Kim +1
We investigate the black string in the context of the string theories. It is shown that the graviton is the only propagating mode in the (2+1)--dimensional extremal black string ba…