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Schweizerischer Nationalfonds (SNF)

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CH-3001 Bern

Tel. +41 31 308 22 22

Titel Englisch | Supercomputer simulations of field theories |
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Gesuchsteller/in | de Forcrand Philippe |

Nummer | 137920 |

Förderungsinstrument | Projektförderung (Abt. I-III) |

Forschungseinrichtung | Institut für Theoretische Physik ETH Zürich |

Hochschule | ETH Zürich - ETHZ |

Hauptdisziplin | Theoretische Physik |

Beginn/Ende | 01.10.2011 - 30.09.2013 |

Bewilligter Betrag | 217'095.00 |

Quantum Chromodynamics; Lattice Field Theory; Monte Carlo

Lead |
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Lay summary |

Quantum Chromodynamics (QCD) describes the strong interactions of quarks |

Direktlink auf Lay Summary | Letzte Aktualisierung: 21.02.2013 |

Publikation |
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Onset Transition to Cold Nuclear Matter from Lattice QCD with Heavy Quarks |

Phase transitions in heavy-quark QCD from an effective theory |

Numerical properties of staggered quarks with a taste-dependent mass term |

A surprise with many-flavor staggered fermions in the strong coupling limit |

Constraints on the two-flavor QCD phase diagram from imaginary chemical potential |

Continuous Time Monte Carlo for Lattice QCD in the Strong Coupling Limit |

Finite density QCD from an effective lattice theory |

New algorithms and new results for strong coupling LQCD |

Towards corrections to the strong coupling limit of staggered lattice QCD |

Walking near a conformal fixed point |

Walking near a Conformal Fixed Point: the 2-d O(3) Model at theta near pi as a Test Case. |

Continuous Time Monte Carlo for Lattice QCD in the Strong Coupling Limit |

Conformality in many-flavour lattice QCD at strong coupling |

Gruppe / Person | Land |
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Formen der Zusammenarbeit |
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Prof. Owe Philipsen, Frankfurt Univ. | Deutschland (Europa) |

- vertiefter/weiterführender Austausch von Ansätzen, Methoden oder Resultaten - Publikation |

Titel | Art des Beitrags | Titel des Artikels oder Beitrages | Datum | Ort | Beteiligte Personen |
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Summer School "Phase structure of gauge theories" | Vortrag im Rahmen einer Tagung | 03.09.2013 | National Taiwan University, Taipei, Taiwan | de Forcrand Philippe; |

Theory Seminar | Einzelvortrag | 10.04.2013 | University of Bern, Schweiz | Langelage Jens; |

Swansea Theory Group Seminar | Einzelvortrag | 06.03.2013 | Swansea University, Grossbritannien und Nordirland | Langelage Jens; |

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

149723 | Supercomputer simulations of field theories | 01.10.2013 | Projektförderung (Abt. I-III) |

Quantum Chromodynamics (QCD) describes the strong interactions of quarks and gluons, the elementary constituents of matter.The study of QCD by numerical Monte Carlo simulations on a lattice isa well-established, successful approach. Thermodynamic properties of QCDcan be determined with reasonable accuracy, for an equilibrium system where the net matter density is zero. When it is non-zero however, the fermion determinant becomes complex, making its interpretation as a sampling probability density impossible. This is the notorious ``sign problem''. We want to study three cases where the sign problem can be circumvented or where interesting physics can be studied in the regime where this problem is mild.* The chiral critical line of (2+1)-flavor QCD in the continuum limit.In the mass plane of the strange quark and the up and down quarks, thisline separates the regime of first-order chiral transitions from thatof crossover, at zero baryon density. Its location turns out to be very sensitive to cutoff effects, so that a careful continuum extrapolation of lattice results must be performed, and is still lacking. The distance of this chiral critical line to the physical quark mass values will tell us how deep QCD is in the crossover region, and thus give some indication about a possible QCD chiral critical point.* The phase diagram of lattice QCD in the strong coupling regime.This is a follow-up to a very successful study of lattice QCD at infinite coupling, where the complete phase diagram could be obtained, as well as the nuclear potential and the masses of nuclei according to their atomic number. We now want to obtain first corrections away from the strong coupling limit, toward continuum QCD.* Numerical simulations of effective models of QCD at finite density.Models of Nambu-Jona-Lasinio type have been used to understand possible behaviours of QCD at low temperature and finite density, with analytic approximate methods. We want to study such models with numerical simulations, focusing in particular on a possible crystalline phase already found in (1+1) dimension.Pursuing these three related subprojects requires the help of a postdoc, Dr. Wolfgang Unger, for whom I ask financial support for two years.

Schweizerischer Nationalfonds (SNF)

Wildhainweg 3Postfach

CH-3001 Bern

Tel. +41 31 308 22 22

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