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Smith College

Series

2008

Articles 1 - 4 of 4

Full-Text Articles in Physics

Josephson Physics Mediated By The Mott Insulating Phase, Smitha Vishveshwara, Courtney Lannert Nov 2008

Josephson Physics Mediated By The Mott Insulating Phase, Smitha Vishveshwara, Courtney Lannert

Physics: Faculty Publications

We investigate the static and dynamic properties of bosonic lattice systems in which condensed and Mott insulating phases coexist due to the presence of a spatially varying potential. We formulate a description of these inhomogeneous systems and calculate the bulk energy at and near equilibrium. We derive the explicit form of the Josephson coupling between disjoint superfluid regions separated by Mott insulating regions. We obtain detailed estimates for the case of alternating superfluid and Mott insulating spherical shells in a radially symmetric parabolically confined cold atom system.

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Latticeeasy: A Program For Lattice Simulations Of Scalar Fields In An Expanding Universe, Gary Felder, Igor Tkachev Jun 2008

Latticeeasy: A Program For Lattice Simulations Of Scalar Fields In An Expanding Universe, Gary Felder, Igor Tkachev

Physics: Faculty Publications

We describe a C++ program that we have written and made available for calculating the evolution of interacting scalar fields in an expanding universe. The program is particularly useful for the study of reheating and thermalization after inflation. The program and its full documentation are available on the Web at http://physics.stanford.edu/gfelder/latticeeasy. In this paper we provide a brief overview of what the program does and what it is useful for.

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Darwin's Bee-Trap: The Kinetics Of Catasetum, A New World Orchid, Charles C. Nicholson, James W. Bales, Joyce E. Palmer-Fortune, Robert G. Nicholson Jan 2008

Darwin's Bee-Trap: The Kinetics Of Catasetum, A New World Orchid, Charles C. Nicholson, James W. Bales, Joyce E. Palmer-Fortune, Robert G. Nicholson

Physics: Faculty Publications

The orchid genera Catasetum employs a hair-trigger activated, pollen release mechanism, which forcibly attaches pollen sacs onto foraging insects in the New World tropics. This remarkable adaptation was studied extensively by Charles Darwin and he termed this rapid response "sensitiveness." Using high speed video cameras with a frame speed of 1000 fps, this rapid release was filmed and from the subsequent footage, velocity, speed, acceleration, force and kinetic energy were computed.

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Clustereasy: A Program For Simulating Scalar Field Evolution On Parallel Computers, Gary Felder Jan 2008

Clustereasy: A Program For Simulating Scalar Field Evolution On Parallel Computers, Gary Felder

Physics: Faculty Publications

We describe a new, parallel programming version of the scalar field simulation program LATTICEEASY. The new C++ program, CLUSTEREASY, can simulate arbitrary scalar field models on distributed-memory clusters. The speed and memory requirements scale well with the number of processors. As with the serial version of LATTICEEASY, CLUSTEREASY can run simulations in one, two, or three dimensions, with or without expansion of the universe, with customizable parameters and output. The program and its full documentation are available on the LATTICEEASY website at http://www.science.smith.edu/departments/Physics/fstaff/gfelder/latticeeasy/. In this paper we provide a brief overview of what CLUSTEREASY does and the ways in which …

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