Nuclear Theory·nucl-th
14 papers—2 primary·12 cross-listed
[Submitted on 30 Jul 2021] (cross-list from hep-ph)
I review recent theory progress reported at the 19th International Conference on Strangeness in Quark Matter (SQM), and discuss open questions to be addressed by the coming editions of SQM.
[Submitted on 31 Jul 2021] (cross-list from hep-lat)
Atsushi Kiyohara🇯🇵 · Masakiyo Kitazawa🇯🇵 · Shinji Ejiri🇯🇵 · Kazuyuki Kanaya🇯🇵
Finite-size scaling is investigated in detail around the critical point in the heavy-quark region of nonzero temperature QCD. Numerical simulations are performed with large spatial volumes up to the aspect ratio at a fixed lattice spacing with . We show that the Binder cumulant and the distribution function of the Polyakov loop follow the finite-size scaling in the universality class for large spatial volumes with , while, for , the Binder cumulant becomes inconsistent with the scaling. To realize the large-volume simulations in the heavy-quark region, we adopt the hopping parameter expansion for the quark determinant: We generate gauge configurations using the leading order action including the Polyakov loop term for , and incorporate the next-to-leading order effects in the measurements by the multipoint reweighting method. We find that the use of the leading-order configurations is crucially effective in suppressing the overlapping problem in the reweighting and thus reducing the statistical errors.
[Submitted on 31 Jul 2021] (cross-list from nlin.PS)
Irrotational ow of a spherical thin liquid layer surrounding a rigid core is described using the defocusing nonlinear Schrodinger equation. Accordingly, azimuthal moving nonlinear waves are modeled by periodic dark solitons expressed by elliptic functions. In the quantum regime the algebraic Bethe ansatz is used in order to capture the energy levels of such motions, which we expect to be relevant for the dynamics of the nuclear clusters in deformed heavy nuclei surface modeled by quantum liquid drops. In order to validate the model we match our theoretical energy spectra with experimental results on energy, angular momentum and parity for alpha particle clustering nuclei.
[Submitted on 31 Jul 2021] (cross-list from hep-ph)
Sindhu D G🇮🇳 · Akhilesh Ranjan🇮🇳
In recent years tetraquark and pentaquark states have received much attention due to the significant experimental findings. In this work masses of some heavy tetraquarks are estimated by considering the spin-spin interaction, the dipole-dipole interaction, and the meson-meson interaction. It is found that such interactions give significant mass contributions. The Regge trajectory of X(3872) state is also studied and is found to be non-linear. Masses of some tetraquark states are also proposed.
[Submitted on 31 Jul 2021] (cross-list from hep-ph)
Kyle Lee🇺🇸 · Jian-Wei Qiu🇺🇸 · George Sterman🇺🇸 · Kazuhiro Watanabe🇺🇸
Heavy quarkonium production at high transverse momentum () in hadronic collisions is explored in the QCD factorization approach. We find that the leading power in the expansion is responsible for high regime, while the next-to-leading power contribution is necessary for the low region. We present the first numerical analysis of the scale evolution of coupled twist-2 and twist-4 fragmentation functions (FFs) for heavy quarkonium production and demonstrate that the QCD factorization approach is capable of describing the spectrum of hadronic production at the LHC.
[Submitted on 31 Jul 2021] (cross-list from physics.chem-ph)
Yann Damour🇫🇷 · Mickaël Véril🇫🇷 · Fábris Kossoski🇫🇷 · Michel Caffarel🇫🇷 · Denis Jacquemin🇫🇷 · Anthony Scemama🇫🇷 · Pierre-François Loos🇫🇷
Following our recent work on the benzene molecule [\href{https://doi.org/10.1063/5.0027617}{J.~Chem.~Phys.~\textbf{153}, 176101 (2020)}], itself motivated by the blind challenge of Eriksen \textit{et al.} [\href{https://doi.org/10.1021/acs.jpclett.0c02621}{J.~Phys.~Chem.~Lett.~\textbf{11}, 8922 (2020)}] on the same system, we report accurate full configuration interaction (FCI) frozen-core correlation energy estimates for twelve five- and six-membered ring molecules in the standard correlation-consistent double- Dunning basis set (cc-pVDZ). Our FCI correlation energy estimates, with estimated error smaller than 1 millihartree, are based on energetically optimized-orbital selected configuration interaction (SCI) calculations performed with the \textit{Configuration Interaction using a Perturbative Selection made Iteratively} (CIPSI) algorithm. Having at our disposal these accurate reference energies, the respective performance and convergence properties of several popular and widely-used families of single-reference quantum chemistry methods are investigated. In particular, we study the convergence properties of i) the Møller-Plesset perturbation series up to fifth-order (MP2, MP3, MP4, and MP5), ii) the iterative approximate coupled-cluster series CC2, CC3, and CC4, and iii) the coupled-cluster series CCSD, CCSDT, and CCSDTQ. The performance of the ground-state gold standard CCSD(T) as well as the completely renormalized CC model, CR-CC(2,3), are also investigated.
[Submitted on 1 Aug 2021] (cross-list from hep-ph)
We propose an improved quark coalescence model for spin alignment of vector mesons by spin density matrix with phase space dependence. Within this model we propose an understanding of spin alignments of vector mesons and in the static limit: a large positive deviation of for mesons from may come from the electric part of the vector field, while a negative deviation of for mesons may come from the electric part of vorticity fields. In the low- region, for mesons is proportional to , which is qualitatively agree with experimental results.
[Submitted on 29 Jul 2021] (cross-list from astro-ph.HE)
We revisit the short-term post-glitch relaxation of the Vela 2000 glitch in the simple two-component model of pulsar glitch by making use of the latest realistic equations of states from the microscopic Brueckner and the relativistic Brueckner theories for neutron stars, which can reconcile with the available astrophysical constraints. We show that to fit both the glitch size and the post-glitch jumps in frequency derivatives approximately one minute after the glitch, the mass of the Vela pulsar is necessarily small, and there may be demands for a stiff equation of state (which results in a typical stellar radius larger than ) and a strong suppression of the pairing gap in the nuclear medium. We discuss the implications of this result on the understanding of pulsar glitches.
[Submitted on 2 Aug 2021] (cross-list from hep-ph)
Hao-Lei Chen🇨🇳 · Xu-Guang Huang🇨🇳 · Jinfeng Liao🇺🇸
We give an introduction to the phase structure of QCD matter under rotation based on effective four-fermion models. The effects of the magnetic field on the rotating QCD matter are also explored. Recent developments along these directions are overviewed, with special emphasis on the chiral phase transition. The rotational effects on pion condensation and color superconductivity are also discussed.
[Submitted on 2 Aug 2021] (cross-list from hep-ph)
Silas R. Beane🇺🇸 · Roland C. Farrell🇺🇸 · Mira Varma🇺🇸
Recent work arXiv:1812.03138 [nucl-th] conjectured that entanglement is minimized in low-energy hadronic scattering processes. It was shown that the minimization of the entanglement power (EP) of the low-energy baryon-baryon -matrix implies novel spin-flavor symmetries that are distinct from large- QCD predictions and are confirmed by high-precision lattice QCD simulations. Here the conjecture of minimal entanglement is investigated for scattering processes involving pions and nucleons. The EP of the -matrix is constructed for the and systems, and the consequences of minimization of entanglement are discussed and compared with large- QCD expectations.
[Submitted on 2 Aug 2021] (cross-list from hep-ph)
Schwinger's boson solution for massless fermions in QED in 1+1D has been applied and generalized to quarks interacting in QED and QCD interactions, leading to stable and confined open-string QED and QCD boson excitations of the quark-QCD-QED system in 1+1D. Just as the open-string QCD excitations in 1+1D can be the idealization of QCD mesons with a flux tube in 3+1D, so the open-string QED excitations in 1+1D may likewise be the idealization of QED mesons with masses in the tens of MeV region, corresponding possibly to the anomalous X17 and E38 particles observed recently. A further search for bound states of quarks interacting in the QED interaction alone leads to the examination on the stability of the QED neutron, consisting of two quarks and one quark. Theoretically, the QED neutron has been found to be stable and estimated to have a mass of 44.5 MeV, whereas the analogous QED proton is unstable, leading to a long-lived QED neutron that may be a good candidate for the dark matter.
[Submitted on 2 Aug 2021] (cross-list from quant-ph)
Bárbara Andrade🇪🇸 · Zohreh Davoudi🇺🇸 · Tobias Graß🇪🇸 · Mohammad Hafezi🇺🇸 · Guido Pagano🇺🇸 · Alireza Seif🇺🇸
Trapped-ion quantum simulators, in analog and digital modes, are considered a primary candidate to achieve quantum advantage in quantum simulation and quantum computation. The underlying controlled ion-laser interactions induce all-to-all two-spin interactions via the collective modes of motion through Cirac-Zoller or Molmer-Sorensen schemes, leading to effective two-spin Hamiltonians, as well as two-qubit entangling gates. In this work, the Molmer-Sorensen scheme is extended to induce three-spin interactions via tailored first- and second-order spin-motion couplings. The scheme enables engineering single-, two-, and three-spin interactions, and can be tuned via an enhanced protocol to simulate purely three-spin dynamics. Analytical results for the effective evolution are presented, along with detailed numerical simulations of the full dynamics to support the accuracy and feasibility of the proposed scheme for near-term applications. With a focus on quantum simulation, the advantage of a direct analog implementation of three-spin dynamics is demonstrated via the example of matter-gauge interactions in the U(1) lattice gauge theory within the quantum link model. The mapping of degrees of freedom and strategies for scaling the three-spin scheme to larger systems, are detailed, along with a discussion of the expected outcome of the simulation of the quantum link model given realistic fidelities in the upcoming experiments. The applications of the three-spin scheme go beyond the lattice gauge theory example studied here and include studies of static and dynamical phase diagrams of strongly interacting condensed-matter systems modeled by two- and three-spin Hamiltonians.
first authorsco-authorsvia INSPIRE