Marco Cristoforetti

TL;DR: A new approach to the sign problem is introduced, that seems to offer much room for improvements, and is illustrated first in the simple case of a scalar field theory with chemical potential, and then extended to the more challenging case of QCD at finite baryonic density.

TL;DR: In this paper, the first practical Monte Carlo calculations of the Lefschetz thimble formulation of quantum field theories with a sign problem were presented, and the results are in excellent agreement with known results.

TL;DR: In this paper, the full nonperturbative ghost and gluon two-point Green functions were computed by using gauge field configurations with twisted-mass quark flavors, and the effect of quark flavor effects on the ghost propagators was investigated in a wide range of momenta, bridging the deep infrared and intermediate momenta domain of QCD interactions.

TL;DR: An efficient method to compute the so-called residual phase that appears when performing Monte Carlo calculations on a Lefschetz thimble is proposed, which is stochastic and its cost scales linearly with the physical volume and quadratically with the length of the extra dimension along the gradient flow.

TL;DR: In this paper, a nonlocal covariant extension of the two-flavor Nambu and Jona-Lasinio model is constructed, with built-in constraints from the running coupling of QCD at high-momentum and instanton physics at low-momential scales.