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Full-Text Articles in Physical Sciences and Mathematics
Branecode: A Program For Simulations Of Braneworld Dynamics, Martin Johannes, Gary Felder, Andrei V. Frolov, Lev Kofman, Marco Peloso
Branecode: A Program For Simulations Of Braneworld Dynamics, Martin Johannes, Gary Felder, Andrei V. Frolov, Lev Kofman, Marco Peloso
Physics: Faculty Publications
We describe an algorithm and a C++ implementation that we have written and made available for calculating the fully nonlinear evolution of 5D braneworld models with scalar fields. Bulk fields allow for the stabilization of the extra dimension. However, they complicate the dynamics of the system, so that analytic calculations (performed within an effective 4D theory) are usually only reliable for static bulk configurations or when the evolution of the extra dimension is negligible. In the general case, the nonlinear 5D dynamics can be studied numerically, and the algorithm and code we describe are the first ones of that type …
Structure And Stability Of Mott-Insulator Shells Of Bosons Trapped In An Optical Lattice, B. Demarco, Courtney Lannert, S. Vishveshwara, T. C. Wei
Structure And Stability Of Mott-Insulator Shells Of Bosons Trapped In An Optical Lattice, B. Demarco, Courtney Lannert, S. Vishveshwara, T. C. Wei
Physics: Faculty Publications
We consider the feasibility of creating a phase of neutral bosonic atoms in which multiple Mott-insulating states coexist in a shell structure and propose an experiment to spatially resolve such a structure. This spatially inhomogeneous phase of bosons, arising from the interplay between the confining potential and the short-ranged repulsion, has been previously predicted. While the Mott-insulator phase has been observed in an atomic gas, the spatial structure of this phase in the presence of an inhomogeneous potential has not yet been directly probed. In this paper, we give a simple recipe for creating a structure with any desired number …
Preheating In New Inflation, Mariel Desroche, Gary Felder, Jan M. Kratochvil, Andrei Linde
Preheating In New Inflation, Mariel Desroche, Gary Felder, Jan M. Kratochvil, Andrei Linde
Physics: Faculty Publications
During the last ten years a detailed investigation of preheating was performed for chaotic inflation and for hybrid inflation. However, nonperturbative effects during reheating in the new inflation scenario remained practically unexplored. We investigate preheating in new inflation, using a combination of analytical and numerical methods. We find that the decay of the homogeneous component of the inflaton field and the resulting process of spontaneous symmetry breaking in the simplest models of new inflation usually occurs almost instantly: for the new inflation on the GUT scale it takes only about 5 oscillations of the field distribution. The decay of the …
Force-Velocity Correlations In A Dense, Collisional, Granular Flow, Emily Gardel, Ellen Keene, Sonia Dragulin, Nalini Easwar, Narayanan Menon
Force-Velocity Correlations In A Dense, Collisional, Granular Flow, Emily Gardel, Ellen Keene, Sonia Dragulin, Nalini Easwar, Narayanan Menon
Physics: Faculty Publications
We report measurements in a 2-dimensional, gravity-driven, collisional, granular flow of the normal force delivered to the wall and of particle velocity at several points in the flow. The wall force and the flow velocity are negatively correlated. This correlation falls off only slowly when the wall force is correlated against the flow velocity at various locations across the channel, but dies away on the scale of a few particle diameters upstream or downstream. The data support a picture of short-lived chains of frequently colliding particles that extend transverse to the flow direction, making transient load-bearing bridges that cause bulk …