Showing 2000Show all

16 papers · 1 filter

hep-th2000★ 5 cited

Rotational Perturbations in Neveu-Schwarz-Neveu-Schwarz String Cosmology

Chiang-Mei Chen, T. Harko, M. K. Mak

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) str…

cs.DS2000

A Decomposition Theorem for Maximum Weight Bipartite Matchings

Ming-Yang Kao, Tak-Wah Lam, Wing-Kin Sung +1

Let G be a bipartite graph with positive integer weights on the edges and without isolated nodes. Let n, N and W be the node count, the largest edge weight and the total weight of…

cond-mat2000★ 27 cited

Nonlinear transport theory for hybrid normal-superconducting devices

Jian Wang, Yadong Wei, Hong Guo +2

We report a theory for analyzing nonlinear DC transport properties of mesoscopic or nanoscopic normal-superconducting (N-S) systems. Special attention was paid such that our theory…

quant-ph2000★ 18 cited

Efficient Quantum Key Distribution Scheme And Proof of Its Unconditional Security

Hoi-Kwong Lo, H. F. Chau, M. Ardehali

We devise a simple modification that essentially doubles the efficiency of the BB84 quantum key distribution scheme proposed by Bennett and Brassard. We also prove the security of…

math.AG2000

Embeddings of hypersurfaces in affine spaces

Vladimir Shpilrain, Jie-Tai Yu

In this paper, we address the following two general problems: given two algebraic varieties in , find out whether or not they are (1) isomorphic; (2) equivalent under an…

math.QA2000★ 1 cited

Poisson and Hamiltonian Superpairs over Polarized Associative Algebras

Xiaoping Xu

Poisson superpair is a pair of Poisson superalgebra structures on a super commutative associative algebra, whose any linear combination is also a Poisson superalgebra structure. In…

cond-mat.stat-mech2000

Exactly Solvable Single Lane Highway Traffic Model With Tollbooths

H. F. Chau, H. Xu, L. -G. Liu

Tolls are collected on many highways as a means of traffic control and revenue generation. However, the presence of tollbooths on highway surely slows down traffic flow. Here, we i…

astro-ph2000

Afterglows from jetted GRB remnants

Y. F. Huang

We have found that the conventional generic dynamical model for gamma-ray bursts (GRBs) cannot reproduce the Sedov solution in the non-relativistic limit. Based on our refined gene…

cond-mat2000★ 784 cited

ab initio modeling of open systems: charge transfer, electron conduction, and molecular switching of a C_{60} device

Jeremy Taylor, Hong Guo, Jian Wang

We present an {\it ab initio} analysis of electron conduction through a molecular device. Charge transfer from the device electrodes to the molecular region is found to pl…

astro-ph2000

Can Rotational Properties of General Relativistic Compact Objects Be Predicted from Static Ones?

K. S. Cheng, T. Harko

We propose an approximate description of basic parameters (radius, mass and oblateness) of general relativistic compact rotating objects in terms of the parameters of the static co…

hep-th2000★ 14 cited

Anisotropic Four-Dimensional NS-NS String Cosmology

Chiang-Mei Chen, T. Harko, M. K. Mak

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 -field…

math.QA2000

Theta Series of Unimodular Lattices, Combinatorial Identities and Weighted Symmetric Polynomials

Xiaoping Xu

We find two combinatorial identities on the theta series of the root lattices of the finite-dimensional simple Lie algebras of type and the cosets in their integral duals,…

cond-mat.mes-hall2000★ 45 cited

Nonadiabatic noncyclic geometric phase and ensemble average spectrum of conductance in disordered mesoscopic rings with spin-orbit coupling

Shi-Liang Zhu, Z. D. Wang

We generalize Yang's theory from the U(1) gauge field to the non-Abelian gauge field. Based on this generalization and taking into account the geometric P…

cond-mat.mes-hall2000★ 162 cited

Carbon Nanotube Based Magnetic Tunnel Junctions

H. Mehrez, Jeremy Taylor, Hong Guo +2

Spin-coherent quantum transport in carbon nanotube magnetic tunnel junctions was investigated theoretically. A spin-valve effect is found for metallic, armchair tubes, with a magne…

astro-ph2000★ 13 cited

Thermal X-Ray Pulses Resulting From Pulsar Glitches

Anisia P. S. Tang, K. S. Cheng

The non-spherically symmetric transport equations and exact thermal evolution model are used to calculate the transient thermal response to pulsars. The three possible ways of ener…

cond-mat.mes-hall2000★ 45 cited

Nonadiabatic noncyclic geometric phase of a spin-1/2 particle subject to an arbitrary magnetic field

Shi-Liang Zhu, Z. D. Wang, Yong-Dong Zhang

We derive a formula of the nonadiabatic noncyclic Pancharatnam phase for a quantum spin-1/2 particle subject to an arbitrary magnetic field. The formula is applied to three specifi…