Donald Weingarten

from Wikipedia, the free encyclopedia

Donald Henry Weingarten (born February 16, 1945 in Boston , Massachusetts ) is an American theoretical physicist .

Weingarten studied physics at Columbia University with a bachelor's degree in 1965 and a doctorate in 1970. As a post-doctoral student , he was at the Fermilab from 1969 to 1971 and at the Niels Bohr Institute from 1971 to 1973 . In 1973/74 he was at the University of Paris-South and then until 1976 at the University of Rochester . In 1976 he became Assistant Professor and 1983 Professor at Indiana University , which he remained until 1984. From 1983 he was at the Thomas J. Watson Research Center at IBM .

He is known for the development of algorithms and their hardware implementation in the lattice theory that led to the calculation of hadron masses and especially the glueball mass . For this purpose, he left Indiana University in 1983 to work with Monty Denneau and other computer architects at IBM to build a special parallel computer for grid calculations in the QCD, the GF11 (with the suffix 11, as they expected it to produce 11 gigaflops would). The development took longer than expected and it was not until 1993 that the results of the computer QCD simulations could be published. They were able to reproduce the experimentally observed masses of a number of hadrons (such as the proton and neutron) with an accuracy of 5 percent with their lattice calculations. They also found a glueball mass of 1.7 GeV (for the lowest, scalar excitation), consistent with a resonance found in 1982 at Brookhaven National Laboratory . At that time there was criticism because the decay rate in three pairs of meson pairs was different (preferably in K mesons) and theorists expected the same decay rates. Also, some theorists doubted that glow balls were stable enough to be observed. Weingarten found in his simulations a sufficient lifespan and an asymmetry of decay as observed. A reliable experimental confirmation of the observation of glow balls is still pending (2012). The experiments are difficult because glow balls mix with mesons.

In 1997 he received the Aneesur Rahman Prize . He is a fellow of the American Physical Society .

Fonts

  • with J. Sexton, A. Vaccarino Numerical evidence for the observation of a scalar glueball , Phys. Rev. Lett., 75, 1995, 4563
  • with Butler, Chen, Sexton, Vaccarino Hadron mass predictions for the valence approximation of lattice QCD , Physical Review Letters, Volume 70, 1993, 2849
  • Quark Physik with the Supercomputer, Spectrum of Science, April 1996
  • Mass inequalities for QCD, Physical Review Letters, Volume 51, 1983, p. 2351
  • Masses and decay constants in lattice QCD, Nuclear Physics B, Volume 215, 1983, pp. 1-22
  • Monte Carlo evaluation of hadron masses in Lattice Gauge Theory with fermions, Physics Letters B, Volume 109, 1981, p. 57

Web links

Individual evidence

  1. ↑ Life data according to American Men and Women of Science , Thomson Gale 2004
  2. ↑ 40,000 times faster than the VAX computer that Weingarten used at the university and 250 times faster than the best supercomputer from Cray at the time
personal data
SURNAME Weingarten, Donald
ALTERNATIVE NAMES Weingarten, Donald Henry (full name)
BRIEF DESCRIPTION American physicist
DATE OF BIRTH February 16, 1945
PLACE OF BIRTH Boston , Massachusetts