## Contact

Swiss National Science Foundation (SNSF)

Wildhainweg 3P.O. Box

CH-3001 Bern

Phone +41 31 308 22 22

English title | Supercomputer simulations of field theories |
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Applicant | de Forcrand Philippe |

Number | 137920 |

Funding scheme | Project funding (Div. I-III) |

Research institution | Institut für Theoretische Physik ETH Zürich |

Institution of higher education | ETH Zurich - ETHZ |

Main discipline | Theoretical Physics |

Start/End | 01.10.2011 - 30.09.2013 |

Approved amount | 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 |

Direct link to Lay Summary | Last update: 21.02.2013 |

Name | Institute |
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Publication |
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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 |

Group / person | Country |
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Types of collaboration |
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Prof. Owe Philipsen, Frankfurt Univ. | Germany (Europe) |

- in-depth/constructive exchanges on approaches, methods or results - Publication |

Title | Type of contribution | Title of article or contribution | Date | Place | Persons involved |
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Summer School "Phase structure of gauge theories" | Talk given at a conference | 03.09.2013 | National Taiwan University, Taipei, Taiwan | de Forcrand Philippe; |

Theory Seminar | Individual talk | 10.04.2013 | University of Bern, Switzerland | Langelage Jens; |

Swansea Theory Group Seminar | Individual talk | 06.03.2013 | Swansea University, Great Britain and Northern Ireland | Langelage Jens; |

Number | Title | Start | Funding scheme |
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122117 | Supercomputer simulations of field theories | 01.10.2009 | Project funding (Div. I-III) |

149723 | Supercomputer simulations of field theories | 01.10.2013 | Project funding (Div. 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.

Swiss National Science Foundation (SNSF)

Wildhainweg 3P.O. Box

CH-3001 Bern

Phone +41 31 308 22 22

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