Teaching statistical physics by thinking about models and algorithms (2007)
We discuss several ways of illustrating fundamental concepts in statistical and thermal physics by considering various models and algorithms. We emphasize the importance of replacing students'...
Homogeneous and heterogeneous nucleation of Lennard-Jones liquids (2007)
Wang, Hui, Gould, Harvey, Klein, W.
The homogeneous and heterogeneous nucleation of a Lennard-Jones liquid is investigated using the umbrella sampling method. The free energy cost of forming a nucleating droplet is determined as a...
Electron electric dipole moment experiment using electric-field quantized slow cesium atoms (2007)
Amini, Jason M., Munger Jr., Charles T., Gould, Harvey
A proof-of-principle electron electric dipole moment (e-EDM) experiment using slow cesium atoms, nulled magnetic fields, and electric field quantization has been performed. With the ambient magnetic...
Approaching equilibrium and the distribution of clusters (2007)
Wang, Hui, Barros, Kipton, Gould, Harvey, Klein, W.
We investigate the approach to stable and metastable equilibrium in Ising models using a cluster representation. The distribution of nucleation times is determined using the Metropolis algorithm and...
Electron electric dipole moment experiment using electric-field quantized slow cesium atoms (2007)
Amini, Jason M., Munger Jr., Charles T., Gould, Harvey
A proof-of-principle electron electric dipole moment (e-EDM) experiment using slow cesium atoms, nulled magnetic fields, and electric field quantization has been performed. With the ambient magnetic...
Harvey Gould, Bill Klein, Kipton Barros, Aaron Schweiger
◮ Metastable states. For example, a liquid supercooled several decades below the freezing temperature without crystallizing. ◮ Nucleation – decay of metastable state to stable phase. ◮ When...
Klein, W., Gould, Harvey, Gulbahce, Natali, Rundle, J. B., Tiampo, K.
We analyze the structure of fluctuations near critical points and spinodals in mean-field and near-mean-field systems. Unlike systems that are non-mean-field, for which a fluctuation can be...
Focusing a fountain of neutral cesium atoms with an electrostatic lens triplet (2006)
Kalnins, Juris G., Amini, Jason M., Gould, Harvey
An electrostatic lens with three focusing elements in an alternating-gradient configuration is used to focus a fountain of cesium atoms in their ground (strong-field-seeking) state. The lens...
Feasibility of a storage ring for polar molecules in strong-field-seeking states (2006)
Nishimura, Hiroshi, Lambertson, Glen, Kalnins, Juris G., Gould, Harvey
We show, through modeling and simulation, that it is feasible to construct a storage ring that will store dense bunches of strong-field-seeking polar molecules at 30 m/s (kinetic energy of 2K) and...
Demonstration of a Cold Atom Fountain Electron Electric Dipole Moment Experiment (2006)
Amini, Jason M., Munger Jr., Charles T., Gould, Harvey
A Cs fountain electron electric dipole moment (EDM) experiment using electric-field quantization is demonstrated. With magnetic fields reduced to 200 pT or less, the electric field lifts the...
Xia, Junchao, Gould, Harvey, Klein, William, Rundle, John B.
Simple models of earthquake faults are important for understanding the mechanisms for their observed behavior in nature, such as Gutenberg-Richter scaling. Because of the importance of long-range...
Simulation of the Burridge-Knopoff Model of Earthquakes with Variable Range Stress Transfer (2005)
Xia, Junchao, Gould, Harvey, Klein, W., Rundle, J. B.
Simple models of earthquake faults are important for understanding the mechanisms for their observed behavior, such as Gutenberg-Richter scaling and the relation between large and small events, which...
Wu, Yong, Koerner, Mathias, Colonna-Romano, Louis, Trebst, Simon, Gould, Harvey, Machta, Jonathan, ...
We study the performance of Monte Carlo simulations that sample a broad histogram in energy by determining the mean first-passage time to span the entire energy space of d-dimensional ferromagnetic...
Understanding the temperature and the chemical potential using computer simulations (2004)
Tobochnik, Jan, Gould, Harvey, Machta, Jonathan
Several Monte Carlo algorithms and applications that are useful for understanding the concepts of temperature and chemical potential are discussed. We then introduce a generalization of the demon...
Heterogeneity in Classical and Non-Classical Nucleation (2004)
Gulbahce, Natali, Klein, W., Gould, Harvey
We investigate heterogeneous and homogeneous nucleation in nearest-neighbor and long-range Ising models for various quench depths. We find that the system has a true crossover from heterogeneous to...
Zeros of the Partition Function and Pseudospinodals in Long-Range Ising Models (2003)
Gulbahce, Natali, Gould, Harvey, Klein, W.
The relation between the zeros of the partition function and spinodal critical points in Ising models with long-range interactions is investigated. We find the spinodal is associated with the zeros...
High precision measurement of the static dipole polarizability of cesium (2003)
Amini, Jason M., Gould, Harvey
The cesium 6S_1/2 scalar dipole polarizability alpha_0 has been determined from the time-of-flight of laser cooled and launched cesium atoms traveling through an electric field. We find alpha_0 =...
Improved alternating gradient transport and focusing of neutral molecules (2001)
Kalnins, Juris, Lambertson, Glen, Gould, Harvey
Polar molecules, in strong-field seeking states, can be transported and focused by an alternating sequence of electric field gradients that focus in one transverse direction while defocusing in the...
Sun, Rongfeng, Gould, Harvey, Machta, Jon, Chayes, Lincoln
Phase transitions of fluid mixtures of the type introduced by Stillinger and Helfand are studied using a continuum version of the invaded cluster algorithm. Particles of the same species do not...
Clusters and Fluctuations at Mean-Field Critical Points and Spinodals (2000)
Klein, W., Gould, Harvey, Tobochnik, J., Alexander, F. J., Anghel, M., Johnson, Gregory
We show that the structure of the fluctuations close to spinodals and mean-field critical points is qualitatively different than the structure close to non-mean-field critical points. This difference...
Computational physics and the undergraduate curriculum (2000)
Abstract: The advantages of a separate undergraduate course emphasizing computer simulations are discussed. Also discussed are the advantages of Java and the timeliness of integrating aspects of...
Slowing and cooling molecules and neutral atoms by time-varying electric field gradients (1999)
Maddi, Jason A., Dinneen, Timothy P., Gould, Harvey
A method of slowing, accelerating, cooling, and bunching molecules and neutral atoms using time-varying electric field gradients is demonstrated with cesium atoms in a fountain. The effects are...
Molecular Dynamics Study of Long-Lived Structures in a Fragile Glass Forming Liquid (1998)
Johnson, Gregory, Melcuk, Andrew I., Gould, Harvey, Klein, W., Mountain, Raymond D.
We present molecular dynamics results for a two component, two-dimensional Lennard-Jones supercooled liquid near the glass transition. We find that the supercooled liquid is spatially heterogeneous...
Monte Carlo study of the Widom-Rowlinson fluid using cluster methods (1997)
Johnson, Gregory, Gould, Harvey, Machta, J., Chayes, L. K.
The Widom-Rowlinson model of a fluid mixture is studied using a new cluster algorithm that is a generalization of the invaded cluster algorithm previously applied to Potts models. Our estimate of the...
THE LAMB SHIFT IN HYDROGENLIKE ARGON (1979)
Gould, Harvey, Marrus, Richard
The Lamb shift S in hydrogenlike argon (Z=18) has been measured by a motional electric field quenching time-of-flight experiment. We find S = (38.0 ± 0.6) THz where the error includes 1σ...
WAVELENGTHS AND OSCILLATOR STRENGTHS OF TRANSITIONS IN Kr XXXIII AND Kr XXXIV (1979)
Dietrich, Daniel, Leavitt, John, Gould, Harvey, Marrus, Richard
We have used the beam foil technique to measure the wavelengths and meanlines of the upper levels of : 1) the 2s 2S1/2-2p 3P01/2, 3/2 resonance transitions in lithium-like Kr XXXIV and 2) the 2s2...
THE LAMB SHIFT IN HYDROGENLIKE ARGON (1979)
Gould, Harvey, Marrus, Richard
The Lamb shift S in hydrogenlike argon (Z=18) has been measured by a motional electric field quenching time-of-flight experiment. We find S = (38.0 ± 0.6) THz where the error includes 1σ...
WAVELENGTHS AND OSCILLATOR STRENGTHS OF TRANSITIONS IN Kr XXXIII AND Kr XXXIV (1979)
Dietrich, Daniel, Leavitt, John, Gould, Harvey, Marrus, Richard
We have used the beam foil technique to measure the wavelengths and meanlines of the upper levels of : 1) the 2s 2S1/2-2p 3P01/2, 3/2 resonance transitions in lithium-like Kr XXXIV and 2) the 2s2...
THE LAMB SHIFT IN HYDROGENLIKE ARGON (1979)
Gould, Harvey, Marrus, Richard
The Lamb shift S in hydrogenlike argon (Z=18) has been measured by a motional electric field quenching time-of-flight experiment. We find S = (38.0 ± 0.6) THz where the error includes 1σ...
WAVELENGTHS AND OSCILLATOR STRENGTHS OF TRANSITIONS IN Kr XXXIII AND Kr XXXIV (1979)
Dietrich, Daniel, Leavitt, John, Gould, Harvey, Marrus, Richard
We have used the beam foil technique to measure the wavelengths and meanlines of the upper levels of : 1) the 2s 2S1/2-2p 3P01/2, 3/2 resonance transitions in lithium-like Kr XXXIV and 2) the 2s2...
Long-wavelength excitations in a Bose gas at zero temperature (1974)
Wong, Victor K., Gould, Harvey
The long-wavelength excitations in a simple model of a dilute Bose gas at zero temperature are investigated from a purely microscopic viewpoint. The role of the interaction and the effects of the...
Structure functions in an interacting Boson system (1972)
Wong, Victor K., Gould, Harvey
A microscopic analysis of the dynamic structure factor in a simple interacting Boson system at T=0 shows that the coherent two-phonon backflow leads to the breakdown of the one-phonon Feynman...
Effect of fluctuations on the thermal conductivity of He I near T[lambda] (1970)
Gould, Harvey, Wong, Victor K.
A microscopic calculation of the contribution of order-parameter fluctuations to the thermal conductivity of liquid helium I near T[lambda] is shown to give results in agreement with experiments and...