Showing 2008Show all

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astro-ph.HE2008★ 66 cited

The First X-Ray Proper-Motion Measurements of the Forward Shock in the Northeastern Limb of SN 1006

Satoru Katsuda, Robert Petre, Knox S. Long +4

We report on the first X-ray proper-motion measurements of the nonthermally-dominated forward shock in the northeastern limb of SN 1006, based on two Chandra observations taken in…

cond-mat.soft2008★ 3 cited

The Classical Nature of Thermal Conduction in Nanofluids

Jacob Eapen, Roberto Rusconi, Roberto Piazza +1

Several new mechanisms have been hypothesized in the recent years to characterize the thermal conduction behavior in nanofluids. In this paper, we show that a large set of nanoflui…

cond-mat.mtrl-sci2008★ 37 cited

Origin of the Ising Ferrimagnetism and Spin-Charge Coupling in LuFe2O4

H. J. Xiang, E. J. Kan, Su-Huai Wei +2

The spin ordering and spin-charge coupling in LuFe2O4 were investigated on the basis of density functional calculations and Monte Carlo simulations. The 2:1 ferrimagnetism arises f…

hep-ph2008★ 9 cited

On flavor violation for massive and mixed neutrinos

M. Blasone, A. Capolupo, C. R. Ji +1

We discuss flavor charges and states for interacting mixed neutrinos in QFT. We show that the Pontecorvo states are not eigenstates of the flavor charges. This implies that their u…

nucl-th2008★ 85 cited

Ground state energy of dilute neutron matter at next-to-leading order in lattice chiral effective field theory

Evgeny Epelbaum, Hermann Krebs, Dean Lee +1

We present lattice calculations for the ground state energy of dilute neutron matter at next-to-leading order in chiral effective field theory. This study follows a series of recen…

cs.DB2008

Equivalence of SQL Queries in Presence of Embedded Dependencies

Rada Chirkova, Michael Genesereth

We consider the problem of finding equivalent minimal-size reformulations of SQL queries in presence of embedded dependencies [1]. Our focus is on select-project-join (SPJ) queries…

stat.ML2008★ 50 cited

Trek separation for Gaussian graphical models

Seth Sullivant, Kelli Talaska, Jan Draisma

Gaussian graphical models are semi-algebraic subsets of the cone of positive definite covariance matrices. Submatrices with low rank correspond to generalizations of conditional in…

math.QA2008★ 5 cited

Principal Realization of the Yangian Y(gl(n))

Chengming Bai, Mo-Lin Ge, Naihuan Jing

Motivated to simplify the structure of tensor representations we give a new set of generators for the Yangian using the principal realization in simple Lie algebras. The…

astro-ph2008★ 81 cited

Dots, clumps and filaments: the intermittent images of synchrotron emission in random magnetic fields of young supernova remnants

Andrei M. Bykov, Yury A. Uvarov, Donald C. Ellison

Non-thermal X-ray emission in some supernova remnants originates from synchrotron radiation of ultra-relativistic particles in turbulent magnetic fields. We address the effect of a…

nucl-ex2008★ 32 cited

The Majorana Neutrinoless Double-Beta Decay Experiment

V. E. Guiseppe

Neutrinoless double-beta decay searches play a major role in determining the nature of neutrinos, the existence of a lepton violating process, and the effective Majorana neutrino m…

astro-ph2008★ 56 cited

High-Resolution X-ray Spectroscopy of SNR 1987A: Chandra LETG and HETG Observations in 2007

Svetozar A. Zhekov, Richard McCray, Daniel Dewey +4

We present an extended analysis of the deep Chandra LETG and HETG observations of the supernova remnant 1987A (SNR 1987A) carried out in 2007. The global fits to the grating spectr…

math.NA2008★ 1 cited

Interval Semantics for Standard Floating-Point Arithmetic

W. W. Edmonson, M. H. van Emden

If the non-zero finite floating-point numbers are interpreted as point intervals, then the effect of rounding can be interpreted as computing one of the bounds of the result accord…

nucl-ex2008★ 35 cited

Evidence for the pair-breaking process in 116,117Sn

U. Agvaanluvsan, A. C. Larsen, M. Guttormsen +5

The nuclear level densities of 116,117Sn below the neutron separation energy have been determined experimentally from the (3He,alpha gamma) and (3He,3He gamma') reactions, respecti…

nucl-ex2008★ 65 cited

Nab: Measurement Principles, Apparatus and Uncertainties

D. Pocanic, R. Alarcon, L. P. Alonzi +23

The Nab collaboration will perform a precise measurement of 'a', the electron-neutrino correlation parameter, and 'b', the Fierz interference term in neutron beta decay, in the Fun…

nlin.PS2008★ 1 cited

Solitary waves of the regularized short pulse and Ostrovsky equations

N. Costanzino, V. Manukian, C. K. R. T. Jones

We derive a model for the propagation of short pulses in nonlinear media. The model is a higher order regularization of the short pulse equation (SPE). The regularization term aris…

nucl-ex2008★ 35 cited

First Measurement of the Neutron -Asymmetry with Ultracold Neutrons

R. W. Pattie

We report the first measurement of angular correlation parameters in neutron -decay using polarized ultracold neutrons (UCN). We utilize UCN with energies below about 200 neV, w…

math.CO2008

Shelling Coxeter-like Complexes and Sorting on Trees

Patricia Hersh

In their work on `Coxeter-like complexes', Babson and Reiner introduced a simplicial complex associated to each tree on nodes, generalizing chessboard complexes and t…

gr-qc2008★ 224 cited

Turduckening black holes: an analytical and computational study

David Brown, Peter Diener, Olivier Sarbach +2

We provide a detailed analysis of several aspects of the turduckening technique for evolving black holes. At the analytical level we study the constraint propagation for a general…

cond-mat.mtrl-sci2008★ 24 cited

First-principles methodology for quantum transport in multiterminal junctions

Kamal K. Saha, Wenchang Lu, J. Bernholc +1

We present a generalized approach for computing electron conductance and I-V characteristics in multiterminal junctions from first-principles. Within the framework of Keldysh theor…

cond-mat.mtrl-sci2008★ 75 cited

Interplay between Jahn-Teller instability, uniaxial magnetism and ferroelectricity in Ca3CoMnO6

Y. Zhang, H. J. Xiang, M. -H. Whangbo

Ca3CoMnO6 is composed of CoMnO6 chains made up of face-sharing CoO6 trigonal prisms and MnO6 octahedra. The structural, magnetic, and ferroelectric properties of this compound were…

nucl-ex2008★ 45 cited

Thermodynamic Properties of Fe

E. Algin, U. Agvaanluvsan, M. Guttormsen +6

Nuclear level densities for Fe have been extracted from the primary -ray spectra using (He,He) and (He,) reactions. Nuclear thermodynamic p…

math.QA2008★ 4 cited

A quantized Tits-Kantor-Koecher algebra

Yun Gao, Naihuan Jing

We propose a quantum analogue of a Tits-Kantor-Koecher algebra with a Jordan torus as an coordinated algebra by looking at the vertex operator construction over a Fock space.

cond-mat.mtrl-sci2008★ 22 cited

Electrical Control of Exchange Bias Mediated by Graphene

Y. G. Semenov, J. M. Zavada, K. W. Kim

The role of graphene in mediating the exchange interaction is theoretically investigated when it is placed between two ferromagnetic dielectric materials. The calculation based on…

nucl-th2008★ 1 cited

From Equilibrium to Transport Properties of Strongly Correlated Fermi Liquids

Thomas Schaefer

We summarize recent results regarding the equilibrium and non-equilibrium behavior of cold dilute atomic gases in the limit in which the two body scattering length a goes to infini…