Showing 1999Show all

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quant-ph1999★ 947 cited

Quantum Cryptography with Entangled Photons

Thomas Jennewein, Christoph Simon, Gregor Weihs +2

By realizing a quantum cryptography system based on polarization entangled photon pairs we establish highly secure keys, because a single photon source is approximated and the inhe…

hep-th1999★ 27 cited

Gauge and gravitational anomalies in D=4 N=1 orientifolds

Claudio A. Scrucca, Marco Serone

The cancellation of U(1)-gauge and U(1)-gravitational anomalies in certain D=4 N=1 Type IIB orientifolds is analyzed in detail, from a string theory point of view. We verify the pr…

hep-th1999★ 32 cited

On the Duality between Perturbative Heterotic Orbifolds and M-Theory on T^4/Z_N

V. Kaplunovsky, J. Sonnenschein, S. Theisen +1

The heterotic string compactified on an orbifold $T^4/\IZ_N$ has gauge group with (massless) states in its twisted sectors which are charged under both…

cond-mat.mes-hall1999★ 90 cited

Mechanical Mixing in Nonlinear Nanomechanical Resonators

A. Erbe, G. Corso, H. Krommer +3

Nanomechanical resonators, machined out of Silicon-on-Insulator wafers, are operated in the nonlinear regime to investigate higher-order mechanical mixing at radio frequencies, rel…

astro-ph1999★ 1 cited

Statistical analysis of large-scale structure in the Universe

Martin Kerscher

Methods for the statistical characterization of the large-scale structure in the Universe will be the main topic of the present text. The focus is on geometrical methods, mainly Mi…

quant-ph1999★ 411 cited

Entanglement of Atomic Ensembles by Trapping Correlated Photon States

M. D. Lukin, S. F. Yelin, M. Fleischhauer

We describe a general technique that allows for an ideal transfer of quantum correlations between light fields and metastable states of matter. The technique is based on trapping q…

hep-th1999★ 3 cited

On the effective action of stable non-BPS branes

Rodolfo Russo, Claudio A. Scrucca

We study the world-volume effective action of stable non-BPS branes present in Type II theories compactified on K3. In particular, by exploiting the conformal description of these…

astro-ph1999★ 66 cited

Redshift-Distance Survey of Early-type Galaxies. I. Sample Selection, Properties and Completeness

L. N. da Costa, M. Bernardi, M. V. Alonso +5

This is the first in a series of papers describing the recently completed all-sky redshift-distance survey of nearby early-type galaxies (ENEAR) carried out for peculiar velocity a…

quant-ph1999★ 157 cited

How to Trap Photons? Storing Single-Photon Quantum States in Collective Atomic Excitations

M. Fleischhauer, S. F. Yelin, M. D. Lukin

We show that it is possible to ``store'' quantum states of single-photon fields by mapping them onto {\it collective} meta-stable states of an optically dense, coherently driven me…

cond-mat.mes-hall1999★ 19 cited

Nanomechanical vibrating wire resonator for phonon spectroscopy in Helium

Andreas Kraus, Artur Erbe, Robert H. Blick

We demonstrate how to build a vibrating wire resonator for phonon excitation in liquid helium. The resonator is designed as a nanoscopic mechanically flexible beam machined out of…

hep-th1999★ 71 cited

Scalar Quartic Couplings in Type IIB Supergravity on

G. Arutyunov, S. Frolov

All quartic couplings of scalar fields that are dual to extended chiral primary operators in SYM are derived by using the covariant equations of motion for t…

hep-th1999★ 63 cited

D-branes on some one- and two-parameter Calabi-Yau hypersurfaces

Emanuel Scheidegger

D-branes on one-parameter Calabi-Yau spaces and two-parameter K3-fibered Calabi-Yau manifolds are analyzed from both the Gepner model point of view and the geometric perspective. W…

hep-ph1999★ 523 cited

Mass and Flavor Mixing Schemes of Quarks and Leptons

Harald Fritzsch, Zhi-zhong Xing

We give an overview of recent progress in the study of fermion mass and flavor mixing phenomena. The hints exhibited by the quark and lepton mass spectra towards possible underlyin…

cond-mat.stat-mech1999★ 88 cited

Critical properties of the reaction - diffusion model 2A -> 3A, 2A ->0

Enrico Carlon, Malte Henkel, Ulrich Schollwoeck

The steady-state phase diagram of the one-dimensional reaction-diffusion model 2A -> 3A, 2A -> 0 is studied through the non-hermitian density matrix renormalization group. In the a…

astro-ph1999★ 101 cited

Backreaction of inhomogeneities on the expansion: the evolution of cosmological parameters

Thomas Buchert, Martin Kerscher, Christian Sicka

Averaging and evolving inhomogeneities are non-commuting operations. This implies the existence of deviations of an averaged model from the standard Friedmann-Lemaitre cosmologies.…

astro-ph1999★ 39 cited

Redshift-Distance Survey of Early-Type Galaxies. IV. Dipoles of the Velocity Field

L. N. da Costa, M. Bernardi, M. V. Alonso +5

We use the recently completed redshift-distance survey of nearby early-type galaxies (ENEAR) to measure the dipole component of the peculiar velocity field to a depth of cz ~ 6000…

astro-ph1999★ 233 cited

A comparison of estimators for the two-point correlation function

Martin Kerscher, Istvan Szapudi, Alex Szalay

Nine of the most important estimators known for the two-point correlation function are compared using a predetermined, rigorous criterion. The indicators were extracted from over 5…

gr-qc1999★ 7 cited

Cosmological models with one extra dimension

A. Yu. Neronov

We consider cosmological models in which a homogeneous isotropic universe is embedded as a 3+1 dimensional surface into a 4+1 dimensional manifold. The size of the extra dimension…

physics.atom-ph1999★ 7 cited

Residual Symmetries in the Spectrum of Periodically Driven Alkali Rydberg States

Andreas Krug, Andreas Buchleitner

We identify a fundamental structure in the spectrum of microwave driven alkali Rydberg states, which highlights the remnants of the Coulomb symmetry in the presence of a non-hydrog…

cond-mat1999★ 78 cited

Far-infrared spectroscopy of nanoscopic InAs rings

Agusti Emperador, Marti Pi, Manuel Barranco +1

We have employed time-dependent local-spin density theory to analyze the far-infrared transmission spectrum of InAs self-assembled nano-rings recently reported [A. Lorke et al, con…

hep-th1999★ 249 cited

Diffeomorphisms and Holographic Anomalies

C. Imbimbo, A. Schwimmer, S. Theisen +1

Using the relation between diffeomorphisms in the bulk and Weyl transformations on the boundary we study the Weyl transformation properties of the bulk metric on shell and of the b…

hep-ex1999★ 44 cited

Measurement of Longitudinal Spin Transfer to Lambda Hyperons in Deep-Inelastic Lepton Scattering

HERMES Collaboration, A. Airapetian

Spin transfer in deep-inelastic Lambda electroproduction has been studied with the HERMES detector using the 27.6 GeV polarized positron beam in the HERA storage ring. For an avera…

hep-ex1999★ 71 cited

Nuclear Effects on R = sigma_L / sigma_T in Deep-Inelastic Scattering

K. Ackerstaff

Cross section ratios for deep-inelastic scattering from 14N and 3He with respect to 2H have been measured by the HERMES experiment at DESY using a 27.5 GeV positron beam. The data…

hep-ex1999★ 30 cited

Measurement of the W+W-gamma Cross-section and First direct Limits on Anomalous Electroweak Quartic Gauge Couplings

The OPAL collaboration, G. Abbiendi

A study of W+W- events accompanied by hard photon radiation produced in e+e- collisions at LEP is presented. Events consistent with two on-shell W-bosons and an isolated photon are…