Massimo D’Elia

Axion phenomenology and θ-dependence from N f = 2 + 1 lattice QCD

A bstractWe investigate the topological properties of Nf = 2 + 1 QCD with physical quark masses, both at zero and finite temperature. We adopt stout improved staggered fermions and explore a range of lattice spacings a ∼ 0.05 − 0.12 fm. At zero temperature we estimate both finite size and finite cut-off effects, comparing our continuum extrapolated results for the topological susceptibility χ with predictions from chiral perturbation theory. At finite temperature, we explore a region going from Tc up to around 4 Tc, where we provide continuum extrapolated results for the topological susceptibility and for the fourth moment of the topological charge distribution. While the latter converges to the dilute instanton gas prediction the former differs strongly both in the size and in the temperature dependence. This results in a shift of the axion dark matter window of almost one order of magnitude with respect to the instanton computation.

Chiral phase transition in two-flavor QCD from an imaginary chemical potential

We investigate the order of the finite temperature chiral symmetry restoration transition for QCD with two massless fermions, by using a novel method, based on simulating imaginary values of the quark chemical potential

Design and optimization of a portable LQCD Monte Carlo code using OpenACC

\mu=i\mu_i,\mu_i\in\mathbb{R}

Recent progress on QCD inputs for axion phenomenology

. Our method exploits the fact that, for low enough quark mass

Roberge-Weiss endpoint at the physical point of N f = 2 + 1 QCD

m

Portable multi-node LQCD Monte Carlo simulations using OpenACC

and large enough chemical potential

Influence of magnetic fields on the color screening masses

\mu_i

Effect of Compactified Dimensions and Background Magnetic Fields on the Phase Structure of SU(N) Gauge Theories

, the chiral transition is decidedly first order, then turning into crossover at a critical mass

Introduction to Quantum Physics

m_c(\mu)

Introduction to Special Relativity

. It is thus possible to determine the critical line in the