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Nuclear Theory·nucl-th

Thursday·October 5, 2023

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 04

    [Submitted on 4 Oct 2023] (cross-list from hep-th)

    Can negative bare couplings make sense? The theory at large

    Ryan D. Weller🇺🇸

    Scalar theory in 3+1D, for a positive coupling constant , is known to have no interacting continuum limit, which is referred to as quantum triviality. However, it has been recently argued that the theory in 3+1D with an -component scalar and a interaction term does have an interacting continuum limit at large . It has been suggested that this continuum limit has a negative (bare) coupling constant and exhibits asymptotic freedom, similar to the -symmetric field theory. In this paper I study the theory in 3+1D at large with a negative coupling constant , and with the scalar field taking values in a -symmetric complex domain. The theory is non-trivial, has asymptotic freedom, and has a Landau pole in the IR, and I demonstrate that the thermal partition function matches that of the positive-coupling theory when the Landau poles of the two theories (in the case a pole in the UV) are identified with one another. The spirit of renormalization is that observables do not depend on the renormalization scale. Here we see even if the coupling is taken negative above the scale of the Landau pole, thermodynamic observables are unaffected. Thus the theory at large appears to have a negative bare coupling constant; the coupling only becomes positive in the IR, which in the context of other -symmetric and large- quantum field theories I argue is perfectly acceptable.

    Comments:
    12 pages, 5 figures; added references for v2; fixed a typo for v3; improved terminology, clarified certain points for v4; made major revisions for v5, including new references
    Subjects:
    High Energy Physics — Theory (hep-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2310.02516 [pdf]
    13 citations
  2. 05

    [Submitted on 4 Oct 2023] (cross-list from hep-ph)

    Anisotropy of magnetized quark matter

    Kangkan Goswami🇮🇳 · Dushmanta Sahu🇮🇳 · Jayanta Dey🇮🇳 · Raghunath Sahoo🇮🇳 · Reinhard Stock🇮🇳

    Strong transient magnetic fields are generated in non-central relativistic heavy-ion collisions. These fields induce anisotropy within the strongly interacting medium that, in principle, can affect the thermodynamic properties of the medium. We use the Polyakov loop extended Nambu Jona-Lasinio model to study the quark matter subjected to an external magnetic field at vanishing baryon chemical potential (). We have estimated the degree of anisotropy in the speed of sound and isothermal compressibility within the magnetized quark matter as a function of temperature () and magnetic field (). This study helps us to understand the extent of directionality generated in the initial stages of non-central collisions while giving us useful information about the system.

    Comments:
    Same as the published version in Phys. Rev. D
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2310.02711 [pdf]
    PRD(2024)·18 citations
  3. 06

    [Submitted on 4 Oct 2023] (cross-list from physics.med-ph)

    Optimized simulations of 50Ti(p,{\alpha}) and 49Ti(d,{\alpha}) reactions for hospital-cyclotron production of 47Sc

    F. Barbaro · L. Canton · Y. Lashko · L. Zangrando

    The production of 47Sc, a promising radioisotope for targeted radionuclide therapy, by means of hospital-cyclotron reactions is investigated. Two possible routes are considered: the proton-induced reaction on enriched 50Ti targets and the deuteron-induced reaction on enriched 49Ti targets. The cross-sections of the reactions are calculated using the TALYS code with optimized parameters and compared with the available experimental data. The optimal energy ranges for the production of 47Sc are determined by taking into account the thick-target yields and the purity of the product. The results show that both reactions can provide high yields and high purity of 47Sc. The feasibility of producing 47Sc with a hospital cyclotron is demonstrated by performing realistic simulations of the irradiation for both 50Ti(p,{\alpha}) and 49Ti(d,{\alpha}) reactions.

    Comments:
    6 pages, 3 figures, 1 table. Proceedings to the VARENNA NRM CONFERENCE, 2023
    Subjects:
    physics.med-ph (physics.med-ph); Nuclear Theory (nucl-th)
    arXiv:
    2310.02825 [pdf]
    EPJ Web Conf.(2024)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE