In my last post, I asked if anyone could remember the video produced by Professor Derek Leinweber about matter fleetingly appearing and disappearing in the ‘empty space’ that represents almost the total volume of the entire universe. I found it again on this website --
https://www.youtube.com/watch?v=J3xLuZNKhlY. It was interesting to hear that it would take enormous amounts of energy to maintain a truly empty space and that if you could attain such a state, it would be unstable.
There is a profile of that scientist on this site --
Professor Derek Leinweber | Researcher Profiles (adelaide.edu.au).
Having just heard about muons in this thread by
Badger, and in the thread by
Hyksos, as well as hearing about tauons from
Faradave, I found the following summary of the work of Leinweber’s group. It contains yet more terms that are foreign to me. Can anyone explain them? QCD by the way stands for Quantum Chromodynamics.
“The Lattice QCD Group in the ARC Centre for the Subatomic Structure of Matter (CSSM) has made many significant contributions to the field and the following list provides a few of the highlights. In particular, we:
• Discovered the existence of meson-baryon bound states in QCD, resolving 50 years speculation. By calculating the quark-sector contributions to the magnetic moment of the Lambda(1405) baryon, an exotic molecular kaon-nucleon bound state was discovered.
• Resolved the structure of the Roper resonance of the nucleon. In an unanticipated discovery, the Roper resonance is not dominated by a quark-model state, rendering decades of quark-model phenomenology obsolete. Instead the Roper is a resonance generated by strong rescattering in multiple meson-baryon scattering channels. It presents a wonderful challenge in determining its electromagnetic structure.
• Established the fundamental role of centre vortices in the gluon field of the nontrivial QCD vacuum in underpinning both the confinement of quarks and the dynamical breaking of chiral symmetry. It is the most fundamental mechanism responsible for dynamical mass generation in hadronic matter.
• Extended the graded-symmetry formalism of Partially Quenched Chiral Perturbation theory to the flavour-singlet sector of baryons.
• Created a novel formalism based on partially-quenched chiral effective field theory and lattice QCD simulations for determining strange-quark contributions to baryon magnetic moments and polarizabilities.
• Resolved the momentum dependence of the nonperturbative quark and gluon propagators via lattice QCD simulations.
• Created the lattice-QCD based visualizations and animations of QCD vacuum structure featured in the 2004 Nobel Prize Acceptance Lecture of Prof. Frank Wilczek, scientific annual reports, posters, popular international science magazines and in YouTube science-video blogs.”