Nuclear Theory·nucl-th

Tuesday·June 7, 2022

11 papers—6 primary·5 cross-listed

07
[Submitted on 3 Jun 2022] (cross-list from hep-th)
Collision of localized shocks in AdS $_{5}$ as a series expansion in transverse gradients
Sebastian Waeber🇺🇸 · Laurence G. Yaffe🇺🇸
We introduce a computational framework to more efficiently calculate the collision of localized shocks in five dimensional asymptotically Anti-de Sitter space. We expand the Einstein equations in transverse gradients and find that our numerical results agree well with exact solutions already at first order in the expansion. Moreover, the Einstein equations at first order in transverse gradients can be decoupled into two sets of differential equations. The bulk fields of one of these sets has only a negligible contribution to boundary observables, such that the computation on each time slice can be simplified to the solution of several planar shockwave equations plus four further differential equations for each transverse plane `pixel'. At the cost of errors of $≲ 10%$ at the hydrodynamization time and for low to mid rapidities, useful numerical solutions can be sped up by roughly one order of magnitude.
Comments:
29 pages, 12 figures
Subjects:
High Energy Physics — Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
arXiv:
2206.01819 [pdf]
JHEP(2022)·4 citations
08
[Submitted on 3 Jun 2022] (cross-list from hep-ph)
A holographic bottom-up description of light nuclide spectroscopy and stability
Miguel Angel Martin Contreras🇨🇱 · Saulo Diles🇨🇱 · Alfredo Vega🇧🇷
This work explores a holographic proposal to describe light nuclide spectroscopy by considering extensions to the well-known bottom-up AdS/QCD proposals, the hardwall and softwall models. We also propose an alternative description inspired by the Woods-Saxon potential. We find the static dilaton associated with this potential in this Wood-Saxon-like model. We compute the nuclide spectra finding that, despite their pure AdS/QCD origin, hardwall and softwall, as monoparametric models, have good accuracy and precision since the RMS error is near 11 $%$ and 4 $%$ respectively. In the case of the Wood-Saxon model, the RMS was around 1 $%$ . We also discuss configurational entropy as a tool to categorize which model is suitable to describe nuclides in terms of stability. We found that configurational entropy resembles a stability line, independent from nuclear spin, for symmetric light nuclides when considering softwall and Wood-Saxon-like models. For the hardwall case, configurational entropy, despite increasing with the constituent number, depends on the nuclear spin. Thus, the Woods-Saxon-like model emerges as the best choice to describe light nuclide spectroscopy in the bottom-up scenario.
Comments:
10 pages, 1 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2206.01834 [pdf]
PLB(2022)·13 citations
09
[Submitted on 4 Jun 2022] (cross-list from hep-ph)
Open charm and bottom meson-nucleon potentials à la nuclear force
Yasuhiro Yamaguchi🇯🇵 · Shigehiro Yasui🇯🇵 · Atsushi Hosaka🇯🇵
We discuss the interaction of an open heavy meson ( $D ˉ$ and $D ˉ^{*}$ for charm or $B$ and $B^{*}$ for bottom) and a nucleon ( $N$ ) by considering the $π$ , $σ$ , $ρ$ , and $ω$ exchange potentials. We construct a potential model by respecting chiral symmetry for light quarks and spin symmetry for heavy quarks. Model parameters are adjusted by referring the phenomenological nuclear (CD-Bonn) potentials reproducing the low-energy $N N$ scatterings. We show that the resulting interaction may accommodate $D ˉ N$ and $B N$ bound states with quantum number $I (J^{P}) = 0 (1/ 2^{-})$ , and a $B N$ bound state with $I (J^{P}) = 1 (1/ 2^{-})$ . We find that, in the present potential model, the $σ$ exchange potential plays an important role.
Comments:
16 pages, 3 figures, 5 tables, published version
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2206.01921 [pdf]
PRD(2022)·9 citations
10
[Submitted on 5 Jun 2022] (cross-list from gr-qc)
Do we need dense matter equation of state in curved spacetime for neutron stars?
Jianing Li🇨🇳 · Tao Guo🇨🇳 · Jiaxing Zhao🇨🇳 · Lianyi He🇨🇳
Neutron stars are regarded as natural laboratories for the study of dense strong interaction matter. The equation of state (EoS) of dense matter computed in flat spacetime is used to predict the structure of neutron stars by solving the Tolman-Oppenheimer-Volkoff (TOV) equation. Recently, it has been reported that the curved spacetime effect or specifically gravitational time dilation effect on the EoS of dense matter leads to a significant increase of the maximum mass limit of neutron stars [Phys. Rev. D \textbf{104}, 123005 (2021) and J. Cosmol. Astropart. Phys. 02 (2021) 026]. However, in this work, we show that to study the hydrostatic equilibrium of dense matter within the framework of general relativity and relativistic fluid dynamics, the grand canonical EoS of dense matter, $p (T, μ)$ , should be the same as that computed in flat spacetime, otherwise it is not consistent with local thermodynamic relations and energy-momentum conservation of the fluid. The gravitation influences the pressure $p$ only through enhancing the temperature $T$ and the chemical potential $μ$ , known as Tolman's law and Klein's law. We rewrite the TOV equation as an alternative version so that the grand canonical EoS computed by using field theoretical methods can be used as a direct input. This may provide a tool to study the grand canonical EoS of dense matter via deep learning.
Comments:
9 pages, 4 figures; published version
Subjects:
General Relativity and Quantum Cosmology (gr-qc); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2206.02106 [pdf]
PRD(2022)·16 citations
11
[Submitted on 6 Jun 2022] (cross-list from hep-lat)
Impact of Dynamical Fermions on the Centre Vortex Gluon Propagator
James Biddle🇦🇺 · Waseem Kamleh🇦🇺 · Derek Leinweber🇦🇺
The impact of $S U (3)$ centre vortices on the Landau-gauge gluon propagator is calculated in the presence of dynamical fermions and compared to the pure Yang-Mills case. The presence of dynamical fermions is found to alter the behaviour of the centre vortex propagator when compared to the established pure-gauge result. The gluon spectral representation is also explored from the centre vortex perspective, where centre vortices are shown to exhibit clear signs of positivity violation, which is an indicator of confinement. Vortex removal subsequently restores positivity, demonstrating the crucial role centre vortices play in the confinement of gluons.
Comments:
9 pages, 12 figures
Subjects:
High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
2206.02320 [pdf]
PRD(2022)·23 citations

Affiliations

first authorsco-authorsvia INSPIRE

Collision of localized shocks in AdS5​ as a series expansion in transverse gradients

A holographic bottom-up description of light nuclide spectroscopy and stability

Open charm and bottom meson-nucleon potentials à la nuclear force

Do we need dense matter equation of state in curved spacetime for neutron stars?

Impact of Dynamical Fermions on the Centre Vortex Gluon Propagator

Affiliations

Collision of localized shocks in AdS $_{5}$ as a series expansion in transverse gradients