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Nuclear Theory·nucl-th

Friday·March 17, 2023

4 papers—3 primary·1 cross-listed

All4Primary3Cross-lists1
  1. 01

    Classification of pairing phase transition in the hot nucleus

    Yuhang Gao · Yanlong Lin · Lang Liu

    The hot nucleus is investigated using covariant density functional theory, where the shell-model-like approach treats the pairing correlation. Lee-Yang's theorem is applied to classify the pairing phase transition by analyzing the distribution of zeros of the partition function in the complex temperature plane. The distribution of zeros of the partition function converges with increasing particle numbers and illustrates the characteristics of the phase transition. In our calculations, we determine the first order of the phase transition near the critical temperature. Different seniority states show the pairing phase transition from a superfluid to a normal phase, ranging from fully paired states to completely unpaired states.

    nucl-thnucl-exIJMPE(2023)·4 citations
  2. 02

    Calculation of Dynamical Response Functions Using a Bound-state Method

    Niels R. Walet · Jagjit Singh · Johannes Kirscher · Michael C. Birse · Harald W. Griesshammer · Judith A. McGovern

    We investigate a method to extract response functions (dynamical polarisabilities) directly from a bound-state approach applied to calculations of perturbation-induced reactions. The use of a square-integrable basis leads to a response in the form of a sum of functions. We integrate this over energy and fit a smooth function to the resulting stepwise-continuous one. Its derivative gives the final approximation to the physical response function. We show that the method reproduces analytical results where known, and analyse the details for a variety of models. We apply it to some simple models, using the Stochastic Variational Method as the numerical method. Although we find that this approach, and other numerical techniques, have some difficulties with the threshold behaviour in coupled-channel problems with multiple thresholds, its stochastic nature allows us to extract robust results even for such cases.

    nucl-thFew Body Syst.(2023)·4 citations
  3. 03

    Hydrodynamic Attractors in Ultrarelativistic Nuclear Collisions

    Jakub Jankowski🇵🇱 · Michał Spaliński🇵🇱

    One of the many physical questions that have emerged from studies of heavy-ion collisions at RHIC and the LHC concerns the validity of hydrodynamic modelling at the very early stages, when the Quark-Gluon Plasma system produced is still far from isotropy. In this article we review the idea of far-from-equilibrium hydrodynamic attractors as a way to understand how the complexity of initial states of nuclear matter is reduced so that a hydrodynamic description can be effective.

    nucl-thhep-phPPNP(2023)·50 citations

Affiliations

first authorsco-authorsvia INSPIRE