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Nuclear Theory·nucl-th

Monday·June 13, 2022

2 papers—1 primary·1 cross-listed

All2Primary1Cross-lists1
  1. 01

    [Submitted on 9 Jun 2022]

    Renormalization group evolution of optical potentials: explorations using a toy model

    M. A. Hisham · R. J. Furnstahl · A. J. Tropiano

    To take full advantage of experimental facilities such as FRIB for applications to nuclear astrophysics, nuclear structure, and explorations of neutrinos and fundamental symmetries, we need a better understanding of the interplay of reaction and structure theory. The renormalization group (RG) is the natural tool for maintaining a consistent treatment of reaction and structure. Here we make a first study of RG for optical potentials, which are important ingredients for direct reactions. To simplify the analysis, we use a pedagogical one-dimensional model and evolve toward low RG resolution using the similarity RG (or SRG). We show how SRG decoupling at low resolution carries over to the optical potential and enhances perturbative approximations, and how induced SRG nonlocality compares to the nonlocality of the optical potential. We discuss the results in the larger context of consistent SRG evolution of operators and wave functions in the analysis of direct reactions.

    Comments:
    13 pages, 9 figures, plus Supplementary Material
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2206.04809 [pdf]
    PRC(2022)·7 citations
  2. 02

    [Submitted on 9 Jun 2022] (cross-list from cond-mat.str-el)

    On the Gravitational Wave to Matter Coupling of Superfluid Fermi Gases Near Unitarity

    Scott Lawrence🇺🇸 · Paul Romatschke🇺🇸

    It is well known that gravitational waves distort equilibrium matter globally, making them amenable to detection with laser interferometers. Less well known is the fact that gravitational waves create local non-equilibrium stresses inside matter, which could conceivably lead to alternative detection methods. The gravitational wave to matter coupling is a transport coefficient depending on the material, and is poorly known for most substances. In the present work, we calculate for a superfluid Fermi gas near unitarity using large- techniques, finding , with the number density and the mass of the fermion, matching the result for free Dirac fermions at zero temperature. Our prediction is amenable to non-perturbative theoretical as well as experimental tests.

    Comments:
    13 pages; comments welcome!
    Subjects:
    Strongly Correlated Electrons (cond-mat.str-el); Quantum Gases (cond-mat.quant-gas); Nuclear Theory (nucl-th)
    arXiv:
    2206.04765 [pdf]
    PRA(2023)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE