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Nuclear Theory·nucl-th

Thursday·January 31, 2019

6 papers—2 primary·4 cross-listed

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  1. 01

    [Submitted on 30 Jan 2019]

    Dynamical Symmetries and Beyond: Lessons and Advances

    A. Leviatan🇮🇱

    A central theme in Iachello's quest for understanding simple ordered patterns in complex quantum systems, is the concept of dynamical symmetry. Relying on his seminal contributions, we present further generalization of this notion to that of partial dynamical symmetry (PDS), for which solvability and good quantum numbers are maintained by only a subset of states. Hamiltonians with a single PDS and multiple PDSs are constructed explicitly and their relevance to nuclear structure is discussed.

    Comments:
    10 pages, 9 figures, Proc. Int. Symposium on "Symmetries and Order: Algebraic Methods in Many Body Systems", in honor of Professor Francesco Iachello, October 5-6, 2018 at Yale University
    Subjects:
    Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
    arXiv:
    1901.10880 [pdf]
    AIP Conf.Proc.(2019)·2 citations
  2. 02

    [Submitted on 30 Jan 2019]

    Evolution of multiplicity fluctuations in heavy ion collisions

    Radka Sochorova🇨🇿 · Boris Tomasik🇸🇰

    The evolution of multiplicity distribution of a species which undergoes chemical reactions can be described with the help of a master equation. We study the master equation for a fixed temperature, because we want to know how fast different moments of the multiplicity distribution approach their equilibrium value. We particularly look at the 3rd and 4th factorial moments and their equilibrium values from which central moments, cumulants and their ratios can be calculated. Then we study the situation in which the temperature of the system decreases. We find out that in the non-equilibrium state, higher factorial moments differ more from their equilibrium values than the lower moments and that the behaviour of the combination of the central moments depends on the combination we choose. If one chooses to determine the chemical freeze-out temperature from the measured values of higher moments, these effects might jeopardise the correctness of the extracted value.

    Comments:
    11 pages, proceedings of CPOD 2018, Corfu, Greece, Sept. 24-28, 2018
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1901.10919 [pdf]
    PoS(2019)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE