The Cubic Form Hypothesis and the Flying Geese Pattern Hypothesis of Income Distribution: The Case of Korea

This paper examines the cubic form hypothesis and the flying geese pattern hypothesis of income distribution. We use time series data for the Gini coefficients of Korea for 1961-2006 and panel data calculated based on a household income survey for the period 1998-2003. We show; (1) The Korean economy has a cubic form inequality as shown in many advanced countries such as the U.S, U.K and Japan, and (2) Different relationships between income inequality and income level are observed among regions since less developed rural areas lagged behind more developed urban ones. Thus the pattern of the change of inequality by region in Korea has similarities to the flying geese pattern and the multiple catching up pattern that are processes of the industrialization of manufacturing.Income inequality, Cubic form, Flying geese pattern of development, Multiple catching-up

Technological Progress and the Future of Kuznets Curve's

We use OECD members' data to ascertain that new-born technological inventions increase the degree of inequality but that this declines as the technology disperses into the overall economy (e.g., Galor and Tsiddon, 1997; Weil, 2005). Therefore, we show explicitly that Kuznets curve does not converge to a single inverted U-curve but fluctuates through technological progress as a sine curve.Kuznets curve; Income inequality; Cubic hypothesis; Technological progress

String Cosmology of the D-brane Universe

We analyze homogeneous anisotropic cosmology driven by the dilaton and the self-interacting ``massive'' antisymmetric tensor field which are indispensable bosonic degrees with the graviton in the NS-NS sector of string theories with D-branes. We found the attractor solutions for this system, which show the overall features of general solutions, and confirmed it through numerical analysis. The dilaton possesses the potential due to the presence of the D-brane and the curvature of extra dimensions. In the presence of the non-vanishing antisymmetric tensor field, the homogeneous universe expands anisotropically while the D-brane term dominates. The isotropy is recovered as the dilaton rolls down and the curvature term dominates. With the stabilizing potential for the dilaton, the isotropy can also be recovered.Comment: 23 pages, 8 figures. Final version, to appear in Phys. Rev.

Multi-BPS D-vortices

We investigate the BPS configuration of the multi D-vortices produced from the D2${\bar {\rm D}}$2 system. Based on the DBI-type action with a Gaussian-type runaway potential for a complex tachyon field, the BPS limit is achieved when the tachyon profile is thin. The solution states randomly-distributed $n$ static D-vortices with zero interaction. With the obtained BPS configuration, we derive the relativistic Lagrangian which describes the dynamics of free massive D-vortices. We also discuss the 90${}^{\circ}$ and 180${}^{\circ}$ scattering of two identical D-vortices, and present its implications on the reconnection in the dynamics of cosmic superstrings.Comment: 11 pages, 4 figures. To appear in the proceedings of APCTP Winter School on Black Hole Astrophysics 2008, Daejeon and Pohang, Korea, 24-29 January, 2008. Submitted to J. Korean Phys. So

Spacetime structure of 5D hypercylindrical vacuum solutions with tension

We investigate geometrical properties of 5D cylindrical vacuum solutions with a transverse spherical symmetry. The metric is uniform along the fifth direction and characterized by tension and mass densities. The solutions are classified by the tension-to-mass ratio. One particular example is the well-known Schwarzschild black string which has a curvature singularity enclosed by a horizon. We focus mainly on geometry of other solutions which possess a naked singularity. The light signal emitted by an object approaching the singularity reaches a distant observer with finite time, but is infinitely red-shifted.Comment: revtex4, 5 pages, 2 figures. To appear in the proceedings of the 10th Asia Pacific Physics Conference (APPC10), Pohang, Korea, 21-24 Aug. 2007. Submitted to J. Korean Phys. Soc. Penrose diagram has been adde