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Nuclear Theory·nucl-th

Friday·October 14, 2022

6 papers—1 primary·5 cross-listed

All6Primary1Cross-lists5
  1. 02

    [Submitted on 12 Oct 2022] (cross-list from hep-ph)

    Quantum partonic transport in QCD matter

    João Barata🇺🇸 · Andrey V. Sadofyev🇪🇸 · Xin-Nian Wang🇺🇸

    We study gradient corrections to the transport equation for energetic light partons in dense QCD environments. In the diffusion limit, the transport dynamics is solely controlled by small-angle elastic scatterings, leading to transverse momentum broadening with respect to the parton's initial direction. Such a parton propagation is usually considered in the limit of transversely homogeneous matter. The transport processes admit a classical description and the transverse spatial dependence of the medium properties emerges only through the jet quenching parameter. In this work, we show that a gradient expansion of the all-order evolution equation for the partonic Wigner function leads to an evolution equation in the Boltzmann-diffusion form only up to the leading order in transverse gradients. At the second order in gradients, the quantum corrections associated with non-local interactions give rise to a novel transport that can be implemented in Monte Carlo simulations. In addition, using our results, we compute the gradient corrections to the jet quenching parameter in inhomogeneous matter.

    Comments:
    6 pages
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2210.06519 [pdf]
    PRD(2023)·34 citations
  2. 03

    [Submitted on 13 Oct 2022] (cross-list from astro-ph.HE)

    Evidence for 3XMM J185246.6+003317 as a massive magnetar with a low magnetic field

    Rafael C. R. de Lima · Jonas P. Pereira · Jaziel G. Coelho · Rafael C. Nunes · Paulo E. F. Stecchini · Manuel Castro · Pierre Gomes · Rodrigo R. da Silva · Claudia V. Rodrigues · José C. N. de Araujo · Michał Bejger · Paweł Haensel · J. Leszek Zdunik

    3XMM J185246.6+003317 is a transient magnetar located in the vicinity of the supernova remnant Kes\,79. So far, observations have only set upper limits to its surface magnetic field and spindown, and there is no estimate for its mass and radius. Using ray-tracing modelling and Bayesian inference for the analysis of several light curves spanning a period of around three weeks, we have found that it may be one of the most massive neutron stars to date. In addition, our analysis suggests a multipolar magnetic field structure with a subcritical field strength and a carbon atmosphere composition. Due to the time-resolution limitation of the available light curves, we estimate the surface magnetic field and the mass to be and ~ at confidence level, while the radius is estimated to be km at confidence level. They were verified by simulations, i.e., data injections with known model parameters, and their subsequent recovery. The best-fitting model has three small hot spots, two of them in the southern hemisphere. These are, however, just first estimates and conclusions, based on a simple ray-tracing model with anisotropic emission; we also estimate the impact of modelling on the parameter uncertainties and the relevant phenomena on which to focus in more precise analyses. We interpret the above best-fitting results as due to accretion of supernova layers/interstellar medium onto 3XMM J185246.6+003317 leading to burying and a subsequent re-emergence of the magnetic field, and a carbon atmosphere being formed possibly due to hydrogen/helium diffusive nuclear burning. Finally, we briefly discuss some consequences of our findings for superdense matter constraints.

    Comments:
    14 pages, 5 figures, 4 tables. Accepted for publication in Journal of High Energy Astrophysics (JHEAP)
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    2210.06648 [pdf]
    JHEAp(2024)·7 citations
  3. 04

    [Submitted on 13 Oct 2022] (cross-list from hep-lat)

    Lattice QCD at finite temperature: some aspects related to chiral symmetry

    Gert Aarts🇮🇹

    Out of the many exciting results obtained with the lattice approach to QCD under extreme conditions, I discuss a few selected items related to chiral symmetry: the chiral condensate as an approximate order parameter, meson screening masses, and masses of baryons and mesons, including D(s) mesons, when approaching the crossover from the hadronic side.

    Comments:
    8 pages, invited plenary talk at Quark Matter 2022, Krakow, Poland, April 4-10 2022
    Subjects:
    High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    2210.06875 [pdf]
    Acta Phys.Polon.Supp.(2023)·1 citation
  4. 05

    [Submitted on 13 Oct 2022] (cross-list from cond-mat.quant-gas)

    Competition between pairing and tripling in one-dimensional fermions with coexistent s- and p-wave interactions

    Yixin Guo · Hiroyuki Tajima

    We theoretically investigate in-medium two- and three-body correlations in one-dimensional two-component Fermi gases with coexistent even-parity s-wave and odd-parity p-wave interactions. We find the solutions of the stable in-medium three-body cluster states such as Cooper triple by solving the corresponding in-medium variational equations. We further feature the phase diagram consisting of the s- and p-wave Cooper pairing phase, and Cooper tripling phase, in the plane of s- and p-wave pairing strengths. The Cooper tripling phase dominates over the pairing phases when both s- and p-wave interactions are moderately strong.

    Comments:
    7 pages, 3 figures
    Subjects:
    Quantum Gases (cond-mat.quant-gas); Strongly Correlated Electrons (cond-mat.str-el); Superconductivity (cond-mat.supr-con); Nuclear Theory (nucl-th)
    arXiv:
    2210.07042 [pdf]
    PRB(2023)·7 citations
  5. 06

    [Submitted on 13 Oct 2022] (cross-list from physics.chem-ph)

    Connections between many-body perturbation and coupled-cluster theories

    Raúl Quintero-Monsebaiz🇫🇷 · Enzo Monino🇫🇷 · Antoine Marie🇫🇷 · Pierre-François Loos🇫🇷

    Here, we build on the works of Scuseria (et al.) http://dx.doi.org/10.1063/1.3043729 and Berkelbach https://doi.org/10.1063/1.5032314 to show connections between the Bethe-Salpeter equation (BSE) formalism combined with the approximation from many-body perturbation theory and coupled-cluster (CC) theory at the ground- and excited-state levels. In particular, we show how to recast the and Bethe-Salpeter equations as non-linear CC-like equations. Similitudes between BSE@ and the similarity-transformed equation-of-motion CC method introduced by Nooijen are also put forward. The present work allows to easily transfer key developments and general knowledge gathered in CC theory to many-body perturbation theory. In particular, it may provide a path for the computation of ground- and excited-state properties (such as nuclear gradients) within the and BSE frameworks.

    Comments:
    6 pages
    Subjects:
    physics.chem-ph (physics.chem-ph); cond-mat.mtrl-sci (cond-mat.mtrl-sci); Nuclear Theory (nucl-th)
    arXiv:
    2210.07043 [pdf]
    J.Chem.Phys.(2022)·7 citations

Affiliations

first authorsco-authorsvia INSPIRE