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Supercomputer simulations of field theories

Titel Englisch Supercomputer simulations of field theories
Gesuchsteller/in de Forcrand Philippe
Nummer 116278
Förderungsinstrument Projektförderung (Abt. I-III)
Forschungseinrichtung Institut für Theoretische Physik ETH Zürich
Hochschule ETH Zürich - ETHZ
Hauptdisziplin Theoretische Physik
Beginn/Ende 01.10.2007 - 30.09.2009
Bewilligter Betrag 95'846.00
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Keywords (6)

Lattice gauge theory; thermodynamics; Quantum field theory; Lattice; Thermodynamicx; Monte Carlo

Lay Summary (Englisch)

Lead
Lay summary
The study of QCD by numerical Monte Carlo simulations on a lattice is a well-established, successful approach. Thermodynamic properties of QCD can be determined with reasonable accuracy, for an equilibrium system where the net matter density is zero. One of the interesting findings is that, even in the deconfined regime, QCD does not behave as a free gas of massless quarks and gluons for experimentally reachable temperatures.• A first subproject investigates this phenomenon in a toy model which is easy to simulate and to some extent analytically tractable, Z2 gauge theory in (2 + 1) dimensions. At non-zero baryon density, the study of QCD by lattice simulations is still in its infancy, because of the “sign problem” which makes the usual Monte Carlo approach inapplicable. Three directions of attack are proposed.• The possible emergence of a crystal phase will be studied in a toy model, the Nambu-Jona-Lasinio model in (2 + 1) dimensions.• The phase diagram of 4-flavor QCD will be investigated via simulations of the canonical ensemble, at fixed non-zero baryon density, allowing for a crosscheck of earlier results on a small system, and a first extrapolation to the thermodynamic limit.• The phase diagram of (2+1)-flavor QCD, including a possible critical point, will be studied on a lattice fine enough that an extrapolation of the result to the continuum limit can be attempted.Pursuing these four related subprojects requires the help of an experienced postdoc, for whom I ask financial support for two years.
Direktlink auf Lay Summary Letzte Aktualisierung: 21.02.2013

Verantw. Gesuchsteller/in und weitere Gesuchstellende

Verbundene Projekte

Nummer Titel Start Förderungsinstrument
108073 Supercomputer simulations of field theories 01.10.2005 Projektförderung (Abt. I-III)
122117 Supercomputer simulations of field theories 01.10.2009 Projektförderung (Abt. I-III)

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