922 research outputs found
POSH: Paris OpenSHMEM: A High-Performance OpenSHMEM Implementation for Shared Memory Systems
In this paper we present the design and implementation of POSH, an
Open-Source implementation of the OpenSHMEM standard. We present a model for
its communications, and prove some properties on the memory model defined in
the OpenSHMEM specification. We present some performance measurements of the
communication library featured by POSH and compare them with an existing
one-sided communication library. POSH can be downloaded from
\url{http://www.lipn.fr/~coti/POSH}. % 9 - 67Comment: This is an extended version (featuring the full proofs) of a paper
accepted at ICCS'1
Ground state for the relativistic one electron atom
We study the Dirac-Maxwell system coupled with an external potential of
Coulomb type. We use the Foldy--Wouthuysen (unitary) transformation of the
Dirac operator and its realization as an elliptic problem in the 4-dim half
space with Neumann boundary condition. Using this approach
we study the existence of a "ground state" solution
Ground states for pseudo-relativistic Hartree equations of critical type
We study the existence of ground state solutions for a class of non-linear
pseudo-relativistic Schr\"odinger equations with critical two-body
interactions. Such equations are characterized by a nonlocal
pseudo-differential operator closely related to the square-root of the
Laplacian. We investigate such a problem using variational methods after
transforming the problem to an elliptic equation with a nonlinear Neumann
boundary conditions
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