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Nuclear Theory·nucl-th

Thursday·May 11, 2023

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 04

    [Submitted on 9 May 2023] (cross-list from hep-th)

    What if theory in 4 dimensions is non-trivial in the continuum?

    Paul Romatschke🇺🇸

    Traditionally, scalar theory in four dimensions is thought to be quantum trivial in the continuum. This tradition is apparently well grounded both in physics arguments and mathematical proofs. Digging into the proofs one finds that they do not actually cover all physically meaningful situations, in particular the case of multi-component fields and non-polynomial action. In this work, I study multi-component scalar field theories in four dimensions in the continuum and show that they do evade the apparently foregone conclusion of triviality. Instead, one finds a non-trivial interacting theory that has two phases, bound states and non-trivial scattering amplitudes in the limit of many components. This has potentially broad implications, both for the foundations of quantum field theory as well as for the experimentally accessible Higgs sector of the Standard Model.

    Comments:
    6 pages, 3 figures; v2:typos fixed, references added; comments still welcome!
    Subjects:
    High Energy Physics — Theory (hep-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2305.05678 [pdf]
    PLB(2023)·35 citations
  2. 05

    [Submitted on 9 May 2023] (cross-list from hep-ph)

    Non-linear chiral magnetic waves

    Kazuki Ikeda🇺🇸 · Dmitri E. Kharzeev🇺🇸 · Shuzhe Shi🇺🇸

    The chiral magnetic wave (CMW) is a macroscopic quantum phenomenon that arises due to the mixing of the electric and chiral charge oscillations induced by the chiral anomaly. In this study we report the first quantum simulation (on classical hardware) of the real-time dynamics of CMWs in Schwinger model. Our quench protocol is the following: at we suddenly place an electric dipole at the middle of our lattice. Due to chiral anomaly, this dipole excites the CMW that propagates towards the edges of the lattice. In Schwinger model tuned to the conformal critical point (at , ), we find a gapless linear CMW that propagates with the speed of light. For massless Schwinger model (), we find a gapped linear CMW, in accord with previous analytical analyses. For massive Schwinger model (that is dual to strongly interacting bosonic theory), we enter the new regime of nonlinear CMWs, where we find a surprise. Specifically, for , the frequency of electric charge oscillations becomes much smaller than the frequency of the oscillations of the chiral charge. For , we find a solution corresponding to a nearly static electric dipole with fast oscillations of the chiral charge confined within. We call this solution a "thumper" and study its properties in detail.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
    arXiv:
    2305.05685 [pdf]
    PRD(2023)·20 citations
  3. 06

    [Submitted on 9 May 2023] (cross-list from hep-ph)

    Planar degeneracy of the three-gluon vertex

    A. C. Aguilar🇧🇷 · M. N. Ferreira🇪🇸 · J. Papavassiliou🇪🇸 · L. R. Santos🇧🇷

    We present a detailed exploration of certain outstanding features of the transversely-projected three-gluon vertex, using the corresponding Schwinger-Dyson equation in conjunction with key results obtained from quenched lattice simulations. The main goal of this study is the scrutiny of the approximate property denominated ``planar degeneracy'', unveiled when the Bose symmetry of the vertex is properly exploited. The planar degeneracy leads to a particularly simple parametrization of the vertex, reducing its kinematic dependence to essentially a single variable. Our analysis, carried out in the absence of dynamical quarks, reveals that the planar degeneracy is particularly accurate for the description of the form factor associated with the classical tensor, for a wide array of arbitrary kinematic configurations. Instead, the remaining three form factors display considerable violations of this property. In addition, and in close connection with the previous point, we demonstrate the numerical dominance of the classical form factor over all others, except in the vicinity of the soft-gluon kinematics. The final upshot of these considerations is the emergence of a very compact description for the three-gluon vertex in general kinematics, which may simplify significantly nonperturbative applications involving this vertex.

    Comments:
    39 pages, 10 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    2305.05704 [pdf]
    EPJC(2023)·21 citations
  4. 07

    [Submitted on 10 May 2023] (cross-list from astro-ph.HE)

    Detectability of a phase transition in neutron star matter with third-generation gravitational wave interferometers

    C. Mondal🇫🇷 · M. Antonelli🇫🇷 · F. Gulminelli🇫🇷 · M. Mancini🇫🇷 · J. Novak🇫🇷 · M. Oertel🇫🇷

    Possible strong first-order hadron-quark phase transitions in neutron star interiors leave an imprint on gravitational waves, which could be detected with planned third-generation interferometers. Given a signal from the late inspiral of a binary neutron star (BNS) coalescence, %the possibility of assessing the presence of such a phase transition depends on the precision that can be attained in the determination of the tidal deformability parameter, as well as on the model used to describe the hybrid star equation of state. For the latter, we employ here a phenomenological meta-modelling of the equation of state that largely spans the parameter space associated with both the low density phase and the quark high density compatible with current constraints. We show that with a network of third-generation detectors, a single loud BNS event might be sufficient to infer the presence of a phase transition at low baryon densities with an average Bayes factor , up to a luminosity distance ( 300 Mpc).

    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    2305.05999 [pdf]
    MNRAS(2023)·20 citations

Affiliations

first authorsco-authorsvia INSPIRE