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Solitary matter waves in combined linear and nonlinear potentials: Detection, stability, and dynamics (2013)

Scott Holmes, Mason A. Porter, Peter Krüger, and Panayotis G. Kevrekidis

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-09-25

Description: Author(s): Scott Holmes, Mason A. Porter, Peter Krüger, and Panayotis G. Kevrekidis We study statically homogeneous Bose-Einstein condensates with spatially inhomogeneous interactions and outline an experimental realization of compensating linear and nonlinear potentials that can yield constant-density solutions. We illustrate how the presence of a step in the nonlinearity coeffici... [Phys. Rev. A 88, 033627] Published Tue Sep 24, 2013

Keywords: Matter waves and collective properties of cold atoms and molecules

Print ISSN: 1050-2947

Electronic ISSN: 1094-1622

Topics: Physics

Published by American Physical Society (APS)

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Defining clusters of related industries (2016)

Delgado, M., Porter, M. E., Stern, S.

Oxford University Press

In: Journal of Economic Geography

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Publication Date: 2016-02-04

Description: Clusters are geographic concentrations of industries related by knowledge, skills, inputs, demand and/or other linkages. There is an increasing need for cluster-based data to support research, facilitate comparisons of clusters across regions and support policymakers in defining regional strategies. This article develops a novel clustering algorithm that systematically generates and assesses sets of cluster definitions (i.e., groups of closely related industries). We implement the algorithm using 2009 data for U.S. industries (six-digit NAICS), and propose a new set of benchmark cluster definitions that incorporates measures of inter-industry linkages based on co-location patterns, input–output links, and similarities in labor occupations. We also illustrate the algorithm’s ability to compare alternative sets of cluster definitions by evaluating our new set against existing sets in the literature. We find that our proposed set outperforms other methods in capturing a wide range of inter-industry linkages, including the grouping of industries within the same three-digit NAICS.

Keywords: C38-Classification Methods ; Cluster Analysis ; Factor Models

Print ISSN: 1468-2702

Electronic ISSN: 1468-2710

Topics: Geography , Economics

Published by Oxford University Press

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Ground state of the two-dimensional attractive Fermi gas: Essential properties from few to many body (2016)

Lukas Rammelmüller, William J. Porter, and Joaquín E. Drut

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2016-03-22

Description: Author(s): Lukas Rammelmüller, William J. Porter, and Joaquín E. Drut We calculate the ground-state properties of unpolarized two-dimensional attractive fermions in the range from few to many particles. Using first-principles lattice Monte Carlo methods, we determine the ground-state energy, Tan's contact, momentum distribution, and single-particle correlation functio… [Phys. Rev. A 93, 033639] Published Mon Mar 21, 2016

Keywords: Matter waves and collective properties of cold atoms and molecules

Print ISSN: 1050-2947

Electronic ISSN: 1094-1622

Topics: Physics

Published by American Physical Society (APS)

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Thermodynamics of one-dimensional SU(4) and SU(6) fermions with attractive interactions (2017)

M. D. Hoffman, A. C. Loheac, W. J. Porter, and J. E. Drut

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2017-03-02

Description: Author(s): M. D. Hoffman, A. C. Loheac, W. J. Porter, and J. E. Drut Motivated by advances in the manipulation and detection of ultracold atoms with multiple internal degrees of freedom, we present a finite-temperature lattice Monte Carlo calculation of the density and pressure equations of state, as well as Tan's contact, of attractively interacting SU(4)- and SU(6)… [Phys. Rev. A 95, 033602] Published Wed Mar 01, 2017

Keywords: Matter waves and collective properties of cold atoms and molecules

Print ISSN: 1050-2947

Electronic ISSN: 1094-1622

Topics: Physics

Published by American Physical Society (APS)

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Evolution from few- to many-body physics in one-dimensional Fermi systems: One- and two-body density matrices and particle-partition entanglement (2017)

Lukas Rammelmüller, William J. Porter, Jens Braun, and Joaquín E. Drut

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2017-09-28

Description: Author(s): Lukas Rammelmüller, William J. Porter, Jens Braun, and Joaquín E. Drut We study the evolution from few- to many-body physics of fermionic systems in one spatial dimension with attractive pairwise interactions. We determine the detailed form of the momentum distribution, the structure of the one-body density matrix, and the pairing properties encoded in the two-body den... [Phys. Rev. A 96, 033635] Published Wed Sep 27, 2017

Keywords: Matter waves and collective properties of cold atoms and molecules

Print ISSN: 1050-2947

Electronic ISSN: 1094-1622

Topics: Physics

Published by American Physical Society (APS)

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Tan's contact and the phase distribution of repulsive Fermi gases: Insights from quantum chromodynamics noise analyses (2017)

William J. Porter and Joaquín E. Drut

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2017-05-20

Description: Author(s): William J. Porter and Joaquín E. Drut Path-integral analyses originally pioneered in the study of the complex-phase problem afflicting lattice calculations of finite-density quantum chromodynamics are generalized to nonrelativistic Fermi gases with repulsive interactions. Using arguments similar to those previously applied to relativist… [Phys. Rev. A 95, 053619] Published Fri May 19, 2017

Keywords: Matter waves and collective properties of cold atoms and molecules

Print ISSN: 1050-2947

Electronic ISSN: 1094-1622

Topics: Physics

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Dark matter interpretation of the Fermi -LAT observation toward the Galactic Center (2017)

Christopher Karwin, Simona Murgia, Tim M. P. Tait, Troy A. Porter, and Philip Tanedo

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2017-05-06

Description: Author(s): Christopher Karwin, Simona Murgia, Tim M. P. Tait, Troy A. Porter, and Philip Tanedo The center of the Milky Way is predicted to be the brightest region of γ -rays generated by self-annihilating dark matter particles. Excess emission about the Galactic center above predictions made for standard astrophysical processes has been observed in γ -ray data collected by the Fermi Large Area … [Phys. Rev. D 95, 103005] Published Fri May 05, 2017

Keywords: Astrophysics and astroparticle physics

Print ISSN: 0556-2821

Electronic ISSN: 1089-4918

Topics: Physics

Published by American Physical Society (APS)

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Dark solitary waves in a class of collisionally inhomogeneous Bose-Einstein condensates (2013)

Chang Wang, Kody J. H. Law, Panayotis G. Kevrekidis, and Mason A. Porter

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2013-02-20

Description: Author(s): Chang Wang, Kody J. H. Law, Panayotis G. Kevrekidis, and Mason A. Porter We study the structure, stability, and dynamics of dark solitary waves in parabolically trapped, collisionally inhomogeneous Bose-Einstein condensates (BECs) with spatially periodic variations of the scattering length. This collisional inhomogeneity yields a nonlinear lattice, which we tune from a s... [Phys. Rev. A 87, 023621] Published Tue Feb 19, 2013

Keywords: Matter waves and collective properties of cold atoms and molecules

Print ISSN: 1050-2947

Electronic ISSN: 1094-1622

Topics: Physics

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Few-fermion systems in one dimension: Ground- and excited-state energies and contacts (2015)

L. Rammelmüller, W. J. Porter, A. C. Loheac, and J. E. Drut

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2015-07-28

Description: Author(s): L. Rammelmüller, W. J. Porter, A. C. Loheac, and J. E. Drut Using the lattice Monte Carlo method, we compute the energy and Tan's contact in the ground state as well as the first excited state of few- to many-fermion systems in a one-dimensional periodic box. We focus on unpolarized systems of N = 4 , 6 , ... , 12 particles, with a zero-range interaction, and a wide… [Phys. Rev. A 92, 013631] Published Mon Jul 27, 2015

Keywords: Matter waves and collective properties of cold atoms and molecules

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Topics: Physics

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Universality in one-dimensional fermions at finite temperature: Density, pressure, compressibility, and contact (2015)

M. D. Hoffman, P. D. Javernick, A. C. Loheac, W. J. Porter, E. R. Anderson, and J. E. Drut

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2015-03-17

Description: Author(s): M. D. Hoffman, P. D. Javernick, A. C. Loheac, W. J. Porter, E. R. Anderson, and J. E. Drut We present finite-temperature, lattice Monte Carlo calculations of the particle number density, compressibility, pressure, and Tan's contact of an unpolarized system of short-range, attractively interacting spin-1/2 fermions in one spatial dimension, i.e., the Gaudin-Yang model. In addition, we comp... [Phys. Rev. A 91, 033618] Published Mon Mar 16, 2015

Keywords: Matter waves and collective properties of cold atoms and molecules

Print ISSN: 1050-2947

Electronic ISSN: 1094-1622

Topics: Physics

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