Wed·Nov 16, 2022Wednesday·November 16, 2022

1. 01*

   Viscosity of pure-glue QCD from the lattice

   Luis Altenkort🇩🇪 · Alexander M. Eller🇩🇪 · Anthony Francis🇹🇼 · Olaf Kaczmarek🇩🇪 · Lukas Mazur🇩🇪 · Guy D. Moore🇩🇪 · Hai-Tao Shu🇩🇪

   We calculate shear viscosity and bulk viscosity in SU(3) gauge theory on the lattice at $1.5T_c$. The viscosities are extracted via a Kubo formula from the reconstructed spectral function which we determine from the Euclidean-time dependence of the corresponding channel of the energy-momentum tensor correlators. We obtain unprecedented precision for the correlators by applying gradient flow and blocking methods. The correlators are extrapolated to the continuum and then to zero flow time. To extract the viscosities we fit theoretically inspired models to the lattice data and crosscheck the fit results using the Backus Gilbert method. The final estimates for shear and bulk viscosity are $\eta /s=0.15-0.48$ and $\zeta /s=0.017-0.059$.

   hep-lathep-phPRD(2023)·43 citations
2. 02*

   Preparation for Quantum Simulation of the 1+1D O(3) Non-linear {\sigma}-Model using Cold Atoms

   Anthony N. Ciavarella🇺🇸 · Stephan Caspar🇺🇸 · Hersh Singh🇺🇸 · Martin J. Savage🇺🇸

   The 1+1D O(3) non-linear {\sigma}-model is a model system for future quantum lattice simulations of other asymptotically-free theories, such as non-Abelian gauge theories. We find that utilizing dimensional reduction can make efficient use of two-dimensional layouts presently available on cold atom quantum simulators. A new definition of the renormalized coupling is introduced, which is applicable to systems with open boundary conditions and can be measured using analog quantum simulators. Monte Carlo and tensor network calculations are performed to determine the quantum resources required to reproduce perturbative short-distance observables. In particular, we show that a rectangular array of 48 Rydberg atoms with existing quantum hardware capabilities should be able to adiabatically prepare low-energy states of the perturbatively-matched theory. These states can then be used to simulate non-perturbative observables in the continuum limit that lie beyond the reach of classical computers.

   ↳ quant-phcond-mat.quant-gashep-latnucl-thPRA(2023)·18 citations
3. 03*

   Emergence of Hadron Mass and Structure

   Minghui Ding🇩🇪 · Craig D. Roberts🇨🇳 · Sebastian M. Schmidt🇩🇪

   Visible matter is characterised by a single mass scale; namely, the proton mass. The proton's existence and structure are supposed to be described by quantum chromodynamics (QCD); yet, absent Higgs boson couplings, chromodynamics is scale invariant. Thus, if the Standard Model is truly a part of the theory of Nature, then the proton mass is an emergent feature of QCD; and emergent hadron mass (EHM) must provide the basic link between theory and observation. Nonperturbative tools are necessary if such connections are to be made; and in this context, we sketch recent progress in the application of continuum Schwinger function methods to an array of related problems in hadron and particle physics. Special emphasis is given to the three pillars of EHM -- namely, the running gluon mass, process-independent effective charge, and running quark mass; their role in stabilising QCD; and their measurable expressions in a diverse array of observables.

   ↳ hep-phhep-exhep-latnucl-ex+1Particles(2023)·117 citations
4. 04*

   Molecular $P_{\psi }$ pentaquarks from light-meson exchange saturation

   Zi-Ying Yang🇨🇳 · Fang-Zheng Peng🇨🇳 · Mao-Jun Yan🇨🇳 · Mario Sánchez Sánchez🇫🇷 · Manuel Pavon Valderrama🇨🇳

   Theoretical predictions for the spectrum of heavy meson-baryon bound states are a fundamental tool for disentangling the nature of the different pentaquark states that have been observed in experimental facilities. Here we explore this spectrum in a phenomenological model that describes the heavy meson-baryon interaction in terms of a contact-range interaction, where the coupling strength is saturated by the exchange of light scalar and vector mesons, i.e. $\sigma$, $\rho$ and $\omega$ exchanges. Saturation determines the couplings modulo an unknown proportionality constant that can be calibrated from a molecular candidate. If we use the $P_{\psi }^N(4312)$ as input, we predict a series of molecular pentaquarks including the $P_{\psi }^N(4440)$ and $P_{\psi }^N(4457)$, the recent $P_{\psi s}^{\Lambda }(4338)$ and the $P_{\psi s}^{\Lambda }(4459)$.

   ↳ hep-phhep-exhep-latnucl-thPRD(2025)·28 citations
5. 05*

   Quantum simulation of quantum mechanical system with spatial noncommutativity

   S. Hasibul Hassan Chowdhury🇧🇩 · Talal Ahmed Chowdhury🇧🇩 · Salah Nasri🇦🇪 · Omar Ibna Nazim🇧🇩 · Shaikh Saad🇨🇭

   Quantum simulation has become a promising avenue of research that allows one to simulate and gain insight into the models of High Energy Physics whose experimental realizations are either complicated or inaccessible with current technology. We demonstrate the quantum simulation of such a model, a quantum mechanical system with spatial noncommutativity, which is inspired by the works in Noncommutative Geometry and Noncommutative Field theory for a universal quantum computer. We use the novel group theoretical formalism to map the Hamiltonian of such a noncommutative quantum system into the ordinary quantum mechanical Hamiltonian and then carry out the quantum simulation using the Trotter-Suzuki product formula. Furthermore, we distinguish the impact of the noncommutativity parameter on the quantum simulation, especially on the Trotter error, and point out how its sizable value affects the simulation.

   ↳ hep-phhep-lathep-thquant-ph0 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.