Topology (and axion's properties) from lattice QCD with a dynamical charm
| Autor: | Anton Trunin, Ernst-Michael Ilgenfritz, Maria Paola Lombardo, Michael Müller-Preussker, Florian Burger |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Quantum chromodynamics
Physics Nuclear and High Energy Physics Instanton Particle physics 010308 nuclear & particles physics High Energy Physics::Lattice High Energy Physics - Lattice (hep-lat) High Energy Physics::Phenomenology Lattice field theory FOS: Physical sciences Fermion Lattice QCD Topology 01 natural sciences High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) High Energy Physics - Lattice 0103 physical sciences Quark–gluon plasma 010306 general physics Axion Topological quantum number |
| Zdroj: | Nuclear Physics A. 967:880-883 |
| ISSN: | 0375-9474 |
| DOI: | 10.1016/j.nuclphysa.2017.07.006 |
| Popis: | We present results on QCD with four dynamical flavors in the temperature range $0.9 \lesssim T/T_c \lesssim 2$. We have performed lattice simulations with Wilson fermions at maximal twist and measured the topological charge with gluonic and fermionic methods. The topological charge distribution is studied by means of its cumulants, which encode relevant properties of the QCD axion, a plausible Dark Matter candidate. The topological susceptibility measured with the fermionic method exhibits a power-law decay for $T/T_c \gtrsim 2$, with an exponent close to the one predicted by the Dilute Instanton Gas Approximation (DIGA). Close to $T_c$ the temperature dependent effective exponent approaches the DIGA result from above, in agreement with recent analytic calculations. These results constrain the axion window, once an assumption on the fraction of axions contributing to Dark Matter is made. 4 pages, proceedings of Quark Matter 2017 - XXVI international conference on ultrarelativistic heavy-ion collisions, February 5-11, 2017, Chicago IL |
| Databáze: | OpenAIRE |
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