Nuclear Theory·nucl-th

Friday·November 15, 2024

12 papers—2 primary·10 cross-listed

01
[Submitted on 14 Nov 2024]
Bottomonium Properties in QGP from a Lattice-QCD Informed T-Matrix Approach
Zhanduo Tang🇺🇸 · Swagato Mukherjee🇺🇸 · Peter Petreczky🇺🇸 · Ralf Rapp🇺🇸
Recent lattice quantum chromodynamics (lQCD) computations of bottomonium correlation functions with extended sources provide new insights into heavy-quark dynamics at distance scales which are of the order of the inverse temperature. We analyze these results employing the thermodynamic T-matrix approach, in a continued effort to interpret lQCD data for quarkonium correlation functions in a non-perturbative framework suitable for strongly coupled systems. Its key inputs are the in-medium driving kernel (potential) of the scattering equation and an interference function which implements 3-body effects in the quarkonium coupling to the thermal medium. A simultaneous description of lQCD results for the bottomonium correlators with extended operators and the previously analyzed Wilson line correlators only requires minor refinements of the potential but calls for stronger interference effects at larger separation of the bottom quark and antiquark. We then analyze the poles of the self-consistent T-matrices on the real axis to assess the survival of the various bound states. We estimate the pertinent temperatures where the poles disappear for the various bottomonium states and discuss the relation to the corresponding peaks in the bottomonium spectral functions. We also recalculate the spatial diffusion coefficient of the QGP and find it to be similar to that in our previous study.
Comments:
20 pages, 18 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2411.09132 [pdf]
PRD(2025)·9 citations
02
[Submitted on 14 Nov 2024]
Gravitational wave asteroseismology of neutron stars with unified EOS: on the role of high-order nuclear empirical parameters
Guilherme Grams🇧🇪 · César V. Flores🇧🇷 · César H. Lenzi🇧🇷
We analyze the sensitivity of non-radial fluid oscillation modes and tidal deformations in neutron stars to high-order nuclear empirical parameters (NEP). In particular, we study the impact of the curvature and skewness of the symmetry energy $K_{sym}$ , $Q_{sym}$ , and the skewness of the binding energy in symmetric nuclear matter $Q_{sat}$ . As we are interested in the possibility of gravitational wave detection by future interferometers, we consider that the tidal interaction is the driving force for the quadrupolar non-radial fluid oscillations. We have also studied the correlations between those quantities, which will be useful to understand the strong physics of gravitational wave phenomena. Our main results show that $K_{sym}$ impacts the frequencies of the fundamental mode mainly for low-mass neutron stars. The NEP $Q_{sym}$ and $Q_{sat}$ affect the fundamental modes of intermediate and heavy neutron stars, respectively. In the case of the first pressure mode, $K_{sym}$ shows a small effect, while $Q_{sat}$ shows a considerable decrease in this oscillation mode independent of the neutron star mass. Similarly, for tidal deformability, the NEP $Q_{sat}$ and $Q_{sym}$ show a bigger impact than $K_{sym}$ . Given the impact of the NEP on gravitational wave phenomena and the currently large uncertainties of these parameters, the prospect of higher sensitivity in future gravitational wave detectors promise a possible new tool to constrain high-order NEP.
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
arXiv:
2411.09322 [pdf]
PRD(2025)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE

Bottomonium Properties in QGP from a Lattice-QCD Informed T-Matrix Approach

Gravitational wave asteroseismology of neutron stars with unified EOS: on the role of high-order nuclear empirical parameters

Affiliations