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BRANE WORLD OF WARP GEOMETRY: AN INTRODUCTORY REVIEW
KIM YOONBAI,LEE CHONG OH,LEE ILBONG,LEE JUNGJAI The Korean Astronomical Society 2004 Journal of The Korean Astronomical Society Vol.37 No.1
Basic idea of Randall-Sundrum brane world model I and II is reviewed with detailed calculation. After introducing the brane world metric with exponential warp factor, metrics of Randall-Sundrum models are constructed. We explain how Randall-Sundrum model I with two branes makes the gauge hierarchy problem much milder, and derive Newtonian gravity in Randall-Sundrum model II with a single brane by considering small fluctuations.
Domain walls in noncommutative field theories
Kim, Yoonbai,Kwon, O-Kab,Lee, Chong Oh IOP Publishing Ltd 2005 Journal of high energy physics Vol.2005 No.1
<P>We study kinks in a wide class of noncommutative (NC) field theories. We find rich structure of the static kinks in DBI type NC tachyon action for an unstable D<I>p</I>-brane with general constant open string metric and NC parameter. Among which thick topological BPS NC kink and tensionless half-kink are particularly intriguing. Reproduction of the correct decent relation between D<I>p</I> and D(<I>p</I>−1) lets us interpret the obtained NC kinks as codimension-one D-brane and its composites. If we turn on DBI type NC U(1) gauge field on an unstable D2-brane, only constant field strength is allowed by gauge equation and NC Bianchi identity. Inclusion of the NC U(1) gauge field induces fundamental string charge localized on the codimension-one brane, which turns D(<I>p</I>−1) into D(<I>p</I>−1)F1.</P>
Classical geometry of de Sitter spacetime : an introductory review
Yoonbai Kim,Chae Young Oh,Namil Park 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.5
The classical geometry of the de Sitter spacetime is reviewed in arbitrary dimensions. Topics include coordinate systems, geodesic motions, and Penrose diagrams with detailed calculations.
Tachyon kinks in boundary string field theory
Kim, Chanju,Kim, Yoonbai,Kwon, O-Kab,Yee, Ho-Ung IOP Publishing Ltd 2006 Journal of high energy physics Vol.2006 No.3
We study tachyon kinks with and without electromagnetic fields in the context of boundary string field theory. For the case of pure tachyon only an array of kink-antikink is obtained. In the presence of electromagnetic coupling, all possible static codimension-one soliton solutions such as array of kink-antikink, single topological BPS kink, bounce, half kink, as well as nonBPS topological kink are found, and their properties including the interpretation as branes are analyzed in detail. Spectrum of the obtained kinks coincides with that of Dirac-Born-Infeld type effective theory.
Coupling between M2-branes and form fields
Kim, Yoonbai,Kwon, O-Kab,Nakajima, Hiroaki,Tolla, D.D. IOP Publishing Ltd 2009 Journal of high energy physics Vol.2009 No.10
In the context of low-energy effective theory of multiple M2-branes, we construct the interaction terms between the world-volume fields of M2-branes and the antisymmetric tensor fields of three- and six-forms. By utilizing the compactification procedure, we show coincidence between the dimensionally reduced coupling and the R-R coupling to D-branes in type II string theory. We also discuss that a cubic term proportional to six-form field reproduces the quartic mass-deformation term in the world-volume theory of multiple M2-branes.