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We calculate the entropy of the brane-world black hole in the RandallSundrum(RS) model by using the brick-wall method. The modes along the extra dimension are semi-classically quantized on the extra dimension. The number of modes in the extra dimension is given as a simple form with the help of the RS mass relation, and then the entropy for the scalar modes… (More)

- Young-Jai Park
- 1995

The theoretical foundation of the object moving faster than light in vacuum (tachyon) is still missing or incomplete. Here we present the classical foundation of the relativistic dynamics including the tachyon. An anomalous sign-factor extracted from the transformation of √ 1− u2/c2 under the Lorentz transformation, which has been always missed in the usual… (More)

- Young-Jai Park
- 1997

A new gauge invariant formulation of the relativistic scalar field interacting with Chern-Simons gauge fields is considered. This formulation is consistent with the gauge fixed formulation. Furthermore we find that canonical (Noether) Poincaré generators are not gauge invariant even on the constraints surface and do not satisfy the (classical) Poincaré… (More)

We investigate synchronization in the presence of delay time modulation for application to communication. We have observed that the robust synchronization is established by a common delay signal and its threshold is presented using Lyapunov exponents analysis. The influence of the delay time modulation in chaotic oscillators is also discussed.

- Sung-Won Kim, Won Tae Kim, Young-Jai Park, Hyeonjoon Shin
- 1996

We semiclassically calculate the entropy of a scalar field in the background of the BTZ black hole, and derive the perimeter law of the entropy within a restricted range for the angular momentum of the black hole. The proper length from the horizon to the ultraviolet cutoff is independent of both the mass and the angular momentum of the black hole.… (More)

- Yong-Wan Kim, Yun Soo Myung, Young-Jai Park
- 2009

Making use of Achucarro-Ortiz type of dimensional reduction, we study the topologically massive gravity with a negative cosmological constant on AdS2 spacetimes. For a constant dilaton, this two-dimensional model also admits three AdS2 vacuum solutions, which are related to two AdS3 and warped AdS3 backgrounds with an identification upon uplifting three… (More)

- Yun Soo Myung, Yong-Wan Kim, Young-Jai Park
- 2006

We apply the generalized uncertainty principle to the black hole thermodynamics. Here we have a black hole system with UV and IR cutoffs. In order to describe the system as a whole, we incorporate the UV thermodynamics with the IR thermodynamics by introducing the geometric means of thermodynamic quantities. As a result, we show that the minimal length… (More)

- Jeongwon Ho, Won Tae Kim, Young-Jai Park, Hyeonjoon Shin
- 1997

Entropy of the Kerr-Newman black hole is calculated via the brick wall method with maintaining careful attention to the contribution of superradiant scalar modes. It turns out that the nonsuperradinat and superradiant modes simultaneously contribute to the entropy with the same order in terms of the brick wall cutoff ǫ. In particular, the contribution of… (More)

- Yun Soo Myung, Yong-Wan Kim, Young-Jai Park
- 2008

We introduce a new attractor mechanism to find the entropy for spherically symmetric extremal black holes. The key ingredient is to find a twodimensional (2D) dilaton gravity with the dilaton potential V (φ). The condition of an attractor is given by ∇2φ = V (φ0) and R̄2 = −V (φ0) and for a constant dilaton φ = φ0, these are also used to find the location… (More)

- Sunghwan Rim, Inbo Kim, Pilshik Kang, Young-Jai Park, Chil-Min Kim
- Physical review. E, Statistical, nonlinear, and…
- 2002

We study the transition route to complete synchronization through phase synchronization in generic coupled nonidentical chaotic oscillators. Through numerical studies, two routes are found, i.e., one, via lag synchronization, the other, via the intermittent chaotic burst state without lag synchronization. We claim that these two routes are universal. As… (More)