5,834 research outputs found
Nuclear forces on the lattice
Recent studies by the NPLQCD collaboration of hadronic interactions using
lattice QCD are reviewed, with an emphasis on a recent calculation of
meson-baryon scattering lengths. Ongoing high-statistics calculations of baryon
interactions are also reviewed. In particular, new insights into the
signal/noise problems that plague correlation functions involving baryons are
discussed.Comment: 12 pages, 12 figures, Talk given at 6th International Workshop on
Chiral Dynamics, Bern, Switzerland, 6-10 Jul 200
Inviscid Simulations of Interacting Flags and Falling Sheets
We present a fluid dynamics video showing simulations of flexible bodies
flapping and falling in an inviscid fluid. Vortex sheets are shed from the
trailing edges of the bodies according to the Kutta condition. For interacting
flags, a sampling of synchronous and asynchronous states are shown. For falling
flexible sheets, the basic behavior is a repeated series of accelerations to a
critical speed at which the sheet buckles, and rapidly decelerates, shedding
large vortices. Examples of persistent circling, quasi-periodic flapping, and
more complex trajectories are shown.Comment: APS DFD Gallery of Fluid Motion 200
New approach to NN with perturbative pions
The current status of effective field theory (EFT) descriptions of
nucleon-nucleon (NN) interactions is briefly reviewed, and a new formulation of
EFT which treats pion interactions perturbatively is presented. This approach
differs from the Kaplan-Savage-Wise (KSW) expansion in that the singular short
distance part of the pion tensor interaction is summed to all orders.Comment: 8 pages, 7 figures, Talk given at 6th International Workshop on
Chiral Dynamics, Bern, Switzerland, 6-10 Jul 200
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