Four dimensional string solutions in Ho\v{r}ava-Lifshitz gravity (2009)
We investigate string-like solutions in four dimensions based on Ho\v{r}ava-Lifshitz gravity. For a restricted class of solutions where the Cotton tensor vanishes, we find that the string-like...
We investigate vortex configurations with the "vulcanization" term inspired by the renormalization of $\phi_\star^4$ theory in the canonical $\theta$-deformed noncommutativity. We focus on the...
Cho, Inyong, Kim, Taekyung, Kim, Yoonbai
We investigate the BPS configuration of the multi D-vortices produced from the D2${\bar {\rm D}}$2 system. Based on the DBI-type action with a Gaussian-type runaway potential for a complex tachyon...
Spacetime Structure of an Inflating Global Monopole (2007)
Inyong Cho, Alexander Vilenkin
The evolution of a global monopole with an inflating core is investigated. An analytic expression for the exterior metric at large distances from the core is obtained. The overall spacetime structure...
Spacetime structure of 5D hypercylindrical vacuum solutions with tension (2007)
Cho, Inyong, Kang, Gungwon, Kim, Sang Pyo, Lee, Chul H.
We investigate geometrical properties of 5D cylindrical vacuum solutions with a transverse spherical symmetry. The metric is uniform along the fifth direction and characterized by tension and mass...
Relativistic Dynamics of Multi-BPS D-vortices and Straight BPS D-strings (2007)
Cho, Inyong, Kim, Taekyung, Kim, Yoonbai, Ryu, Kyungha
Moduli space dynamics of multi-D-vortices from D2${\bar {\rm D}}$ (equivalently, parallel straight D-strings from D3${\bar {\rm D}}$3) is systematically studied. For the BPS D-vortices, we show...
Inflating magnetically charged braneworlds (2007)
Cho, Inyong, Vilenkin, Alexander
Numerical solutions of Einstein, scalar, and gauge field equations are found for static and inflating defects in a higher-dimensional spacetime. The defects have $(3+1)$-dimensional core and magnetic...
Gravity of superheavy higher-dimensional global defects (2007)
Cho, Inyong, Vilenkin, Alexander
Numerical solutions of Einstein's and scalar-field equations are found for a global defect in a higher-dimensional spacetime. The defect has a $(3+1)$-dimensional core and a ``hedgehog'' scalar-field...
Brane world in a texture (2007)
We study five dimensional brane physics induced by an O(2) texture formed in one extra dimension. The model contains two 3-branes of nonzero tension, and the extra dimension is compact. The...
Evolution of Tachyon Kink with Electric Field (2006)
Cho, Inyong, Kwon, O-Kab, Lee, Chong Oh
We investigate the decay of an inhomogeneous D1-brane wrapped on a $S^1$ with an electric field. The model that we consider consists of an array of tachyon kink and anti-kink with a constant electric...
Cosmological Aspects of the D-brane World (2006)
Cho, Inyong, Chun, Eung Jin, Kim, Hang Bae, Kim, Yoonbai
The D-brane world is an idea that we are living on the D-brane imbedded in a 10- or 11-dimensional spacetime of string theories, aiming at the construction of realistic models from string theories....
String Cosmology of the D-brane Universe (2006)
Cho, Inyong, Chun, Eung Jin, Kim, Hang Bae, Kim, Yoonbai
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...
Cosmological implication of antisymmetric tensor field on D-brane (2006)
Cho, Inyong, Chun, Eung Jin, Kim, Hang Bae, Kim, Yoonbai
We discuss the cosmological implications of an antisymmetric tensor field when it experiences a kind of ``Higgs mechanism,'' including nonlocal interaction terms, on D-branes. Even when a huge...
DF-strings from D3${\bar {\bf D}}$3 as Cosmic Strings (2005)
Cho, Inyong, Kim, Yoonbai, Kyae, Bumseok
We study Dirac-Born-Infeld type effective field theory of a complex tachyon and U(1)$\times$U(1) gauge fields describing a D3${\bar {\rm D}}$3 system. Classical solutions of straight global and local...
Localizing global hedgehogs on the brane (2004)
We investigate the localization of 4D topological global defects on the brane embedded in 5D. The defects are induced by 5D scalar fields with a symmetry-breaking potential. Taking an ansatz which...
Stability of inflating branes in a texture (2004)
We investigate the stability of inflating branes embedded in an O(2) texture formed in one extra dimension. The model contains two 3-branes of nonzero tension, and the extra dimension is compact....
Inflating magnetically charged braneworlds (2003)
Cho, Inyong, Vilenkin, Alexander
Numerical solutions of Einstein, scalar, and gauge field equations are found for static and inflating defects in a higher-dimensional spacetime. The defects have $(3+1)$-dimensional core and magnetic...
Gravity of superheavy higher-dimensional global defects (2003)
Cho, Inyong, Vilenkin, Alexander
Numerical solutions of Einstein's and scalar-field equations are found for a global defect in a higher-dimensional spacetime. The defect has a $(3+1)$-dimensional core and a ``hedgehog'' scalar-field...
Brane world in a texture (2002)
We study five dimensional brane physics induced by an O(2) texture formed in one extra dimension. The model contains two 3-branes of nonzero tension, and the extra dimension is compact. The...
O(4) texture with a cosmological constant (2002)
We investigate O(4) textures in a background with a positive cosmological constant. We find static solutions which co-move with the expanding background. There exists a solution in which the scalar...
A universe in a global monopole (2001)
Benson, Katherine, Cho, Inyong
We investigate brane physics in a universe with an extra dimensional global monopole and negative bulk cosmological constant. The graviton zero mode is naturally divergent; we thus invoke a physical...
Stability of self-gravitating magnetic monopoles (2000)
Arreaga, Guillermo, Cho, Inyong, Guven, Jemal
The stability of a spherically symmetric self-gravitating magnetic monopole is examined in the thin wall approximation: modeling the interior false vacuum as a region of de Sitter space; the exterior...
Charged Vacuum Condensate Near a Superconducting Cosmic String (1999)
Nascimento, J. R. S., Cho, Inyong, Vilenkin, Alexander
A charged superconductiong cosmic string produces an extremely large electric field in its vicinity. This leads to vacuum instability and to the formation of a charged vacuum condensate which screens...
Gravitational field of vacuumless defects (1998)
Cho, Inyong, Vilenkin, Alexander
It has been recently shown that topological defects can arise in symmetry breaking models where the scalar field potential $V(\phi)$ has no minima and is a monotonically decreasing function of...
Vacuum defects without a vacuum (1998)
Cho, Inyong, Vilenkin, Alexander
Topological defects can arise in symmetry breaking models where the scalar field potential $V(\phi)$ has no minima and is a monotonically decreasing function of $|\phi|$. The properties of such...
Inflation and Nonsingular Spacetimes of Cosmic Strings (1998)
Inflation of cosmic gauge and global strings is investigated by numerically solving the combined Einstein and field equations. Above some critical symmetry-breaking scales, the strings undergo...
Modelling the dynamics of global monopoles (1998)
A thin wall approximation is exploited to describe a global monopole coupled to gravity. The core is modelled by de Sitter space; its boundary by a thin wall with a constant energy density; its...
Spacetime structure of an inflating global monopole (1997)
Cho, Inyong, Vilenkin, Alexander
The evolution of a global monopole with an inflating core is investigated. An analytic expression for the exterior metric at large distances from the core is obtained. The overall spacetime structure...