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- P. Maris
- 1996

We investigate the influence of the full vacuum polarization and vertex function on the fermion propagator, using the coupled Dyson–Schwinger equations for the photon and fermion propagator. We show that, within a range of vertex functions, the general behavior of the fermion propagator does not depend on the exact details of the vertex, both in the… (More)

- Philip Sternberg, Esmond G. Ng, +4 authors Hung Viet Le
- SC
- 2008

- P Maris
- 1995

The standard approximations of the Dyson–Schwinger equation lead to complex singularities of the fermion propagator. In three-dimensional QED one can show that this phenomenon might be related to confinement: a confining potential leads to mass-like singularities at complex momenta, and thus to the absence of a mass singularity on the real timelike axis.… (More)

group-improved rainbow-ladder truncation exhibit bound state poles below and above Tc, the critical temperature for chiral symmetry restoration. Above Tc the bound state amplitudes are identical, as are the positions and residues of the pseudoscalar and scalar poles in the vertices. In the chiral limit the π → γγ coupling vanishes at Tc, as do fπ, mσ, gσππ.… (More)

- Hasan Metin Aktulga, Chao Yang, Esmond G. Ng, Pieter Maris, James P. Vary
- Concurrency and Computation: Practice and…
- 2014

- Pieter Maris, Masha Sosonkina, James P. Vary, Esmond G. Ng, Chao Yang
- ICCS
- 2010

- Hasan Metin Aktulga, Chao Yang, Esmond G. Ng, Pieter Maris, James P. Vary
- Euro-Par
- 2012

- Avinash Srinivasa, Masha Sosonkina, Pieter Maris, James P. Vary
- 2011 IEEE International Symposium on Parallel and…
- 2011

Computational resource availability often changes during the course of execution of an application. This is especially true in modern multi-user cluster environments where users can run many high-performance applications simultaneously which share resources such as Processing Elements (PEs), I/O, main memory, network. In such a scenario, it would be greatly… (More)

- P Maris, J P Vary, P Navrátil, W E Ormand, H Nam, D J Dean
- Physical review letters
- 2011

We report the microscopic origins of the anomalously suppressed beta decay of ¹⁴C to ¹⁴N using the ab initio no-core shell model with the Hamiltonian from the chiral effective field theory including three-nucleon force terms. The three-nucleon force induces unexpectedly large cancellations within the p shell between contributions to beta decay, which reduce… (More)

- Scott Bogner, Aurel Bulgac, +28 authors Stefan M. Wild
- Computer Physics Communications
- 2013

The UNEDF project was a large-scale collaborative effort that applied high-performance computing to the nuclear quantum many-body problem. UNEDF demonstrated that close associations among nuclear physicists, mathematicians, and computer scientists can lead to novel physics outcomes built on algorithmic innovations and computational developments. This review… (More)