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Nuclear Theory·nucl-th

Friday·October 11, 2024

11 papers—6 primary·5 cross-listed

All11Primary6Cross-lists5
  1. 07

    [Submitted on 9 Oct 2024] (cross-list from quant-ph)

    Toward hybrid quantum simulations with qubits and qumodes on trapped-ion platforms

    Jack Y. Araz🇺🇸 · Matt Grau🇺🇸 · Jake Montgomery🇺🇸 · Felix Ringer🇺🇸

    We explore the feasibility of gate-based hybrid quantum computing using both discrete (qubit) and continuous (qumode) variables on trapped-ion platforms. Trapped-ion systems have demonstrated record one- and two-qubit gate fidelities and long qubit coherence times, while qumodes, which can be represented by the collective vibrational modes of the ion chain, have remained relatively unexplored for their use in computing. Using numerical simulations, we show that high-fidelity hybrid gates and measurement operations can be achieved for existing trapped-ion quantum platforms. As an exemplary application, we consider quantum simulations of the Jaynes-Cummings-Hubbard model, which is given by a one-dimensional chain of interacting spin and boson degrees of freedom. Using classical simulations, we study its real-time evolution and develop a suitable variational quantum algorithm for ground state preparation. Our results motivate further studies of hybrid quantum computing in this context, which may lead to direct applications in condensed matter and fundamental particle and nuclear physics.

    Comments:
    23 pages, 12 figures
    Subjects:
    Quantum Physics (quant-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th); Atomic Physics (physics.atom-ph)
    arXiv:
    2410.07346 [pdf]
    PRA(2025)·37 citations
  2. 08

    [Submitted on 10 Oct 2024] (cross-list from hep-th)

    Quantum Hall liquids in high-density QCD

    Kentaro Nishimura🇯🇵 · Naoki Yamamoto🇯🇵 · Ryo Yokokura🇯🇵

    There exist metastable domain walls of the flavor-singlet meson for the axial symmetry in two-flavor color superconductivity (2SC) in QCD at large baryon density. We show that, due to the coupling of to confined gluons in the 2SC phase, the effective theory on the domain wall is described by the Chern-Simons theory, which is dual to the Chern-Simons theory. This theory has a spin-1 droplet excitation that does not carry a baryon number, which we identify as a vector meson. We also discuss the effective theories and baryonic droplet excitations on the domain walls of the flavor-singlet mesons in the superfluid phases of QCD at large isospin density and two-color QCD at large baryon density.

    Comments:
    13 pages; v2: minor revisions, published version
    Subjects:
    High Energy Physics — Theory (hep-th); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2410.07665 [pdf]
    PRD(2025)·0 citations
  3. 09

    [Submitted on 10 Oct 2024] (cross-list from hep-ph)

    Quantifying the Jet Energy Loss in Pb+Pb collisions at LHC

    Vineet Kumar🇮🇳 · Prashant Shukla🇮🇳

    In this work, we give a method to study the energy loss of jets in the medium using a variety of jet energy loss observables such as nuclear modification factor and transverse momentum asymmetry in dijets and -jets in heavy ion collisions. The energy loss of jets in the medium depends mainly on the size and the properties of medium viz. temperature and is a function of energy of the jets as predicted by various models. A Monte Carlo (MC) method is employed to generate the transverse momentum and path-lengths of the initial jets that undergo energy loss. Using different scenarios of energy loss, the transverse momentum and system size dependence of nuclear modification factors and different measures of dijet momentum imbalance at energies = 2.76 TeV and 5.02 TeV and -jet asymmetry at =2.76 TeV in Pb+Pb collisions are simulated. The results are compared with the measurements by ATLAS and CMS experiments as a function of transverse momentum and centrality. The study demonstrates how the system size and energy dependence of jet energy loss can be quantified using various experimental observables.

    Comments:
    24 pages, 15 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    2410.07852 [pdf]
    EPJA(2024)·1 citation
  4. 10

    [Submitted on 10 Oct 2024] (cross-list from hep-th)

    Three-point functions from a Schwinger-Keldysh effective action, resummed in derivatives

    Navid Abbasi🇨🇳 · Dirk H. Rischke🇩🇪

    The search for the conjectured QCD critical point in heavy-ion collisions requires to account for far-from equilibrium effects as well as fluctuations, and in particular non-Gaussian fluctuations, in the modeling of the dynamics of the hot and dense matter created in such collisions. In order to study far-from equilibrium effects as well as fluctuations, in this work we construct a Schwinger-Keldysh effective field theory (EFT) for the diffusion of the density to all orders in derivatives. The dissipation in the free part of our EFT follows the Boltzmann equation in the relaxation-time approximation (RTA). The interaction part of the EFT is constructed based on the self-interaction of the density field. We analytically find the quadratic and cubic parts of the KMS-invariant EFT in closed form, resummed in derivatives. We then explicitly compute the symmetrized three-point function at tree level, and investigate its analytical structure in detail. We also analytically calculate the branch-point singularity that appears in the structure of the two-point response function due to loop effects. Our results are important for future studies of the real-time dynamics of the correlation functions and the possible relation to thermalization when the system is far from equilibrium.

    Comments:
    42 pages, 2 figures, 1 table. v2: Section 2.5 improved; Figure 5 added; Section 4.5 added; Section 4.6 improved; additional references included
    Subjects:
    High Energy Physics — Theory (hep-th); Strongly Correlated Electrons (cond-mat.str-el); Nuclear Theory (nucl-th)
    arXiv:
    2410.07929 [pdf]
    JHEP(2025)·13 citations
  5. 11

    [Submitted on 10 Oct 2024] (cross-list from hep-ph)

    Anomalous couplings and the Columbia plot

    Francesco Giacosa🇵🇱 · Győző Kovács🇭🇺 · Péter Kovács🇭🇺 · Robert D. Pisarski🇭🇺 · Fabian Rennecke🇩🇪

    When the quark masses are lighter than those in QCD, the standard lore is that a chiral transition of first order must emerge for three, light flavors. Recently, however, numerical simulations on the lattice suggest that the chiral transition is of second order in the chiral limit. Using an extended linear sigma model in the mean field approximation, we study the relation between terms which break the anomalous, symmetry and the order of the chiral phase transition, especially how a chiral transition of second order can arise for three, massless flavors. We note that in an (unphysical) region of the "Columbia" phase diagram, when the strange quark mass is light and negative, corresponding to topological angle , the symmetry is spontaneously broken.

    Comments:
    12 pages, 2 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    2410.08185 [pdf]
    PRD(2025)·25 citations

Affiliations

first authorsco-authorsvia INSPIRE