6533b7d4fe1ef96bd1262662

RESEARCH PRODUCT

Lattice quantum hadrodynamics on a CRAY Y-MP

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Quantum corrections to the mean-field equation of state for nuclear matter are estimated in a lattice simulation of quantum hadrodynamics on a CRAY Y-MP. In contrast with lattice quantum chromodynamics, where coordinate space methods are the standard, the calculations are carried out in momentum space and on nonhypercubic (irregular) lattices. The quantum corrections to the known, mean-field equation of state were found to be considerable. The time frame of the project and the large computational needs of the program required the use of powerful supercomputers, like the CRAY Y-MP, which are capable of performing at a very high computing speed by using both vector and parallel hardware, the latter being exploited by means of autotasking. The paper describes the applied analytical and the numerical methods as well as the changes needed for the program to be executed in parallel. After some code modifications a very efficient version could be obtained on a CRAY Y-MP8/832, leading to an overall performance of 2.13 gigaflops.