Young-Jai Park

Learn More
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)
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.
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)
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)
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)
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)
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)