Global solutions for higher-dimensional stretched small black holes (2009)
Chen, Chiang-Mei, Gal'tsov, Dmitri V., Ohta, Nobuyoshi, Orlov, Dmitry G.
Small black holes in heterotic string theory have vanishing horizon area at the supergravity level, but the horizon is stretched to the finite radius $AdS_2 \times S^{D-2}$ geometry once higher...
The RN/CFT Correspondence Revisited (2009)
Chen, Chiang-Mei, Sun, Jia-Rui, Zou, Shou-Jyun
We reconsidered the quantum gravity description of the near horizon extremal Reissner-Nordstr{\o}m black hole in the viewpoint of the AdS$_2$/CFT$_1$ correspondence. We found that, for pure electric...
Optimal Choices of Reference for Quasi-local Energy (2009)
Chen, Chiang-Mei, Liu, Jian-Liang, Nester, James M., Wu, Ming-Fan
We have proposed a program for determining the reference for the quasi-local energy defined in the covariant Hamiltonian formalism. Our program has been tested by applying it to the spherically...
Holographic Duals of Black Holes in Five-dimensional Minimal Supergravity (2009)
Chen, Chiang-Mei, Wang, John E.
We examine the dual conformal field theory for extremal charged black holes in five-dimensional minimal supergravity with 2 independent angular momenta. The conformal field theory Virasoro algebra,...
Giant Magnons and Spiky Strings on S^3 with B-field (2008)
Chen, Chiang-Mei, Tsai, Jia-Hao, Wen, Wen-Yu
We study solutions for a rotating string on S^3 with a background NS-NS B-field and show the existence of spiky string and giant magnon as two limiting solutions. We make a connection to the...
Extremal dyonic black holes in D=4 Gauss-Bonnet gravity (2008)
Chen, Chiang-Mei, Gal'tsov, Dmitri V., Orlov, Dmitry G.
We investigate extremal dyon black holes in the Einstein-Maxwell-dilaton (EMD) theory with higher curvature corrections in the form of the Gauss-Bonnet density coupled to the dilaton. In the same...
Extremal dilatonic black holes in 4D Gauss-Bonnet gravity (2007)
This is a report of our recent investigation on the extremal dilatonic black holes in four dimensional Gauss-Bonnet gravity. We found that a global solution can exist only when the dilaton coupling...
Entropy Function and Universality of Entropy-Area Relation for Small Black Holes (2007)
Cai, Rong-Gen, Chen, Chiang-Mei, Maeda, Kei-ichi, Ohta, Nobuyoshi, Pang, Da-Wei
We discuss the entropy-area relation for the small black holes with higher curvature corrections by using the entropy function formalism and field redefinition method. We show that the entropy...
$G_2$ generating technique for minimal D=5 supergravity and black rings (2007)
Bouchareb, Adel, Chen, Chiang-Mei, Clement, Gerard, Gal'tsov, Dmitri V., Scherbluk, Nikolai G., Wolf, Thomas
A solution generating technique is developed for D=5 minimal supergravity with two commuting Killing vectors based on the $G_2$ U-duality arising in the reduction of the theory to three dimensions....
Quasi-local energy for cosmological models (2007)
Chen, Chiang-Mei, Liu, Jian-Liang, Nester, James M.
First we briefly review our covariant Hamiltonian approach to quasi-local energy, noting that the Hamiltonian-boundary-term quasi-local energy expressions depend on the chosen boundary conditions and...
Extremal black holes in D=4 Gauss-Bonnet gravity (2006)
Chen, Chiang-Mei, Gal'tsov, Dmitri V., Orlov, Dmitry G.
We show that four-dimensional Einstein-Maxwell-Dilaton-Gauss-Bonnet gravity admits asymptotically flat black hole solutions with a degenerate event horizon of the Reissner-Nordstr\"om type...
Addendum to "Hyperbolic Space Cosmologies" (2006)
Chen, Chiang-Mei, Ho, Pei-Ming, Neupane, Ishwaree P., Ohta, Nobuyoshi, Wang, John E.
In our earlier paper [JHEP 0310 (2003) 058], we considered higher dimensional cosmological models with hyperbolic spaces. In particular the eternal accelerating expansion was obtained by studying...
The Hamiltonian boundary term and quasi-local energy flux (2005)
Chen, Chiang-Mei, Nester, James M., Tung, Roh-Suan
The Hamiltonian for a gravitating region includes a boundary term which determines not only the quasi-local values but also, via the boundary variation principle, the boundary conditions. Using our...
Intersecting Non-extreme p-Branes and Linear Dilaton Background (2005)
Chen, Chiang-Mei, Gal'tsov, Dmitri V., Ohta, Nobuyoshi
We construct the general static solution to the supergravity action containing gravity, the dilaton and a set of antisymmetric forms describing the intersecting branes delocalized in the relative...
Quasi-local energy-momentum and energy flux at null infinity (2005)
Wu, Xiaoning, Chen, Chiang-Mei, Nester, James M.
The null infinity limit of the gravitational energy-momentum and energy flux determined by the covariant Hamiltonian quasi-local expressions is evaluated using the NP spin coefficients. The reference...
Quasilocal Center-of-Mass for Teleparallel Gravity (2004)
Nester, James M., Ho, Fei-Hong, Chen, Chiang-Mei
Asymptotically flat gravitating systems have 10 conserved quantities, which lack proper local densities. It has been hoped that the teleparallel equivalent of Einstein's GR (TEGR, aka GR${}_{||}$)...
Quasilocal Center-of-Mass (2004)
Nester, James M., Meng, Feng-Feng, Chen, Chiang-Mei
Gravitating systems have no well-defined local energy-momentum density. Various quasilocal proposals have been made, however the center-of-mass moment (COM) has generally been overlooked....
Chen, Chiang-Mei, Vazquez-Poritz, J. F.
We construct deformed, T^2 wrapped, rotating M2-branes on a resolved cone over Q^{1,1,1} and Q^{1,1,1}/Z_2, as well as on a product of two Eguchi-Hanson instantons. All worldvolume directions of...
Hyperbolic Space Cosmologies (2003)
Chen, Chiang-Mei, Ho, Pei-Ming, Neupane, Ishwaree P., Ohta, Nobuyoshi, Wang, John E.
We present a systematic study of accelerating cosmologies obtained from M/string theory compactifications of hyperbolic spaces with time-varying volume. A set of vacuum solutions where the internal...
A Note on Acceleration from Product Space Compactification (2003)
Chen, Chiang-Mei, Ho, Pei-Ming, Neupane, Ishwaree P., Wang, John E.
We study compactifications of Einstein gravity on product spaces in vacuum and their acceleration phases. Scalar potentials for the dimensionally reduced effective theory are found to be of...
Supergravity Null Scissors and Super-Crosses (2003)
Chen, Bin, Chen, Chiang-Mei, Lin, Feng-Li
In this paper we construct the supergravity solutions for the orthogonally intersecting null scissors and the fluxed D-strings. We name the latter as the super-crosses according to their shape. It...
Spinor Formulations for Gravitational Energy-Momentum (2002)
Chen, Chiang-Mei, Nester, James M., Tung, Roh-Suan
We first describe a class of spinor-curvature identities (SCI) which have gravitational applications. Then we sketch the topic of gravitational energy-momentum, its connection with Hamiltonian...
Rotational Perturbations of High Density Matter in the Brane Cosmology (2002)
Chen, Chiang-Mei, Harko, T., Kao, W. F., Mak, M. K.
We consider the evolution of small rotational perturbations, with azimuthal symmetry, of the brane-world cosmological models. The equations describing the temporal, radial, and angular dependence of...
S-brane Solutions in Supergravity Theories (2002)
Chen, Chiang-Mei, Gal'tsov, Dmitri V., Gutperle, Michael
In this paper time dependent solutions of supergravities with dilaton and arbitrary rank antisymmetric tensor field are found. Although the solutions are nonsupersymmetric the equations of motions...
Stability of the Anisotropic Brane Cosmology (2002)
The stability of the Bianchi type I anisotropic brane cosmology is analyzed in this paper. We also study the effect of the brane solution by comparing the models on the 3-brane and the models in the...
Rotational Perturbations of Friedmann-Robertson-Walker Type Brane-World Cosmological Models (2002)
Chen, Chiang-Mei, Harko, T., Kao, W. F., Mak, M. K.
First order rotational perturbations of the Friedmann-Robertson-Walker metric are considered in the framework of the brane-world cosmological models. A rotation equation, relating the perturbations...
Supergravity Fluxbranes in Various Dimensions (2001)
Chen, Chiang-Mei, Gal'tsov, Dmitri V., Saffin, Paul M.
We investigate fluxbrane solutions to the Einstein-antisymmetric form-dilaton theory in arbitrary space-time dimensions for a transverse space of cylindrical topology $S^k\times R^n$, corresponding...
Inverse dualisation and non-local dualities between Einstein gravity and supergravities (2001)
Chen, Chiang-Mei, Gal'tsov, Dmitri V., Sharakin, Sergei A.
We investigate non-local dualities between suitably compactified higher-dimensional Einstein gravity and supergravities which can be revealed if one reinterprets the dualised Kaluza-Klein two-forms...
Viscous dissipative effects in isotropic brane cosmology (2001)
Chen, Chiang-Mei, Harko, T., Mak, M. K.
We consider the dynamics of a viscous cosmological fluid in the generalized Randall-Sundrum model for an isotropic brane. To describe the dissipative effects we use the Israel-Hiscock-Stewart full...
Topological Z_{N+1} Charges on Fuzzy Sphere (2001)
Chan, Chuan-Tsung, Chen, Chiang-Mei, Yang, Hyun Seok
We study the topological properties of fuzzy sphere. We show that the topological charge is only defined modulo N+1, that is finite integer quotient Z_{N+1}, where N is a cut-off spin of fuzzy...
CP^n Model on Fuzzy Sphere (2001)
Chan, Chuan-Tsung, Chen, Chiang-Mei, Lin, Feng-Li, Yang, Hyun Seok
We construct the CP^n model on fuzzy sphere. The Bogomolny bound is saturated by (anti-)self-dual solitons and the general solutions of BPS equation are constructed. The dimension of moduli space...
Stability Analysis of Anisotropic Inflationary Cosmology (2001)
The stability analysis of an anisotropic inflationary universe of the four dimensional Neveu-Schwarz--Neveu-Schwarz string model with a nonvanishing cosmological constant is discussed in this paper....
Exact anisotropic brane cosmologies (2001)
Chen, Chiang-Mei, Harko, T., Mak, M. K.
We present exact solutions of the gravitational field equations in the generalized Randall-Sundrum model for an anisotropic brane with Bianchi type I and V geometry, with perfect fluid and scalar...
Rotational Perturbations in Neveu-Schwarz-Neveu-Schwarz String Cosmology (2000)
Chen, Chiang-Mei, Harko, T., Mak, M. K.
First order rotational perturbations of the flat Friedmann-Robertson-Walker (FRW) metric are considered in the framework of four dimensional Neveu-Schwarz-Neveu-Schwarz (NS-NS) string cosmological...
Gravitational Energy-Momentum in MAG (2000)
Nester, James M., Chen, Chiang-Mei, Wu, Yu-Heui
Energy-momentum (and angular momentum) for the Metric-Affine Gravity theory is considered from a Hamiltonian perspective (linked with the Noether approach). The important roles of the Hamiltonian...
Dyonic Wormholes in 5D Kaluza-Klein Theory (2000)
New spherically symmetric dyonic solutions, describing a wormhole-like class of spacetime configurations in five-dimensional Kaluza-Klein theory, are given in an explicit form. For this type of...
Anisotropic Four-Dimensional NS-NS String Cosmology (2000)
Chen, Chiang-Mei, Harko, T., Mak, M. K.
An anisotropic (Bianchi type I) cosmology is considered in the four-dimensional NS-NS sector of low-energy effective string theory coupled to a dilaton and an axion-like $H$-field within a de...
Bianchi Type I Cosmologies in Arbitrary Dimensional Dilaton Gravities (2000)
Chen, Chiang-Mei, Harko, T., Mak, M. K.
We study the low energy string effective action with an exponential type dilaton potential and vanishing torsion in a Bianchi type I space-time geometry. In the Einstein and string frames the general...
A Symplectic Hamiltonian Derivation of Quasilocal Energy-Momentum for GR (2000)
Chen, Chiang-Mei, Nester, James M.
The various roles of boundary terms in the gravitational Lagrangian and Hamiltonian are explored. A symplectic Hamiltonian-boundary-term approach is ideally suited for a large class of quasilocal...
Bianchi Type I Cosmology in N=2, D=5 Supergravity (1999)
Chen, Chiang-Mei, Harko, T., Mak, M. K.
The dynamics and evolution of Bianchi type I space-times is considered in the framework of the four-dimensional truncation of a reduced theory obtained from the N=2,D=5 supergravity. The general...
Energy-Momentum (Quasi-)Localization for Gravitating Systems (1999)
Chang, Chia-Chen, Nester, James M., Chen, Chiang-Mei
Traditional approaches to energy-momentum localization led to reference frame dependent pseudotensors. The more modern idea is quasilocal energy-momentum. We take a Hamiltonian approach. The...
Einstein Gravity - Supergravity Correspondence (1999)
Chen, Chiang-Mei, Gal'tsov, Dmitri V., Sharakin, Sergei A.
A correspondence between the three-block truncated 11D supergravity and the 8D pure Einstein gravity with two commuting Killing symmetries is discussed. The Kaluza-Klein two-forms of the 6D theory...
Intersecting M-Fluxbranes (1999)
Chen, Chiang-Mei, Gal'tsov, Dmitri V., Sharakin, Sergei A.
New solution to the six-dimensional vacuum Einstein's equations is constructed as a non-linear superposition of two five-dimensional solutions representing the Melvin-Gibbons-Maeda Universe and its...
Vacuum Interpretation for Supergravity M-Branes (1999)
Chen, Chiang-Mei, Gal'tsov, Dmitri V., Sharakin, Sergei A.
A non-local classical duality between the three-block truncated 11D supergravity and the 8D vacuum gravity with two commuting Killing symmetries is established. The supergravity four-form field is...
SL(4,R) generating symmetry in five-dimensional gravity coupled to dilaton and three-form (1999)
Chen, Chiang-Mei, Gal'tsov, Dmitri V., Maeda, Kei-ichi, Sharakin, Sergei A.
We give an explicit formulation of the three-dimensional $SL(4,R)/SO(2,2) \sigma$-model representing the five-dimensional Einstein gravity coupled to the dilaton and the three-form field for...
T-Duality and Spinning Solutions in 2 + 1 Gravity (1998)
Starting with the 2+1 Einstein--Maxwell--Dilaton system with a cosmological constant and assuming two commuting Killing symmetries we derive the corresponding $1+0 \sigma$--model. It is shown that,...
Quasilocal Energy-Momentum for Geometric Gravity Theories (1994)
Chen, Chiang-Mei, Nester, James M., Tung, Roh Suan
From a covariant Hamiltonian formulation, using symplectic ideas, we obtain covariant quasilocal energy-momentum boundary expressions for general gravity theories. The expressions depend upon which...