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Nuclear Theory·nucl-th

Wednesday·January 6, 2021

4 papers—2 primary·2 cross-listed

All4Primary2Cross-lists2
  1. 01

    [Submitted on 29 Dec 2020]

    A model investigation of the longitudinal broadening of the transverse momentum two-particle correlator

    Niseem Magdy🇺🇸 · Roy A. Lacey🇺🇸

    The Multi-Phase Transport model (AMPT) is used to investigate the longitudinal broadening of the transverse momentum two-particle correlator , and its utility to extract the specific shear viscosity, , of the quark-gluon plasma formed in ultra-relativistic heavy ion collisions. The results from these model studies indicate that the longitudinal broadening of is sensitive to the magnitude of . However, reliable extraction of the longitudinal broadening of the correlator requires the suppression of possible self-correlations associated with the definition of the collision centrality.

    Comments:
    6 pages, 5 figures, Accepted in Physical Review C
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2101.01555 [pdf]
    PRC(2021)·8 citations
  2. 02

    [Submitted on 5 Jan 2021]

    Chiral Effective Field Theory and the High-Density Nuclear Equation of State

    C. Drischler🇺🇸 · J.W. Holt🇺🇸 · C. Wellenhofer🇩🇪

    Born in the aftermath of core collapse supernovae, neutron stars contain matter under extraordinary conditions of density and temperature that are difficult to reproduce in the laboratory. In recent years, neutron star observations have begun to yield novel insights into the nature of strongly interacting matter in the high-density regime where current theoretical models are challenged. At the same time, chiral effective field theory has developed into a powerful framework to study nuclear matter properties with quantified uncertainties in the moderate-density regime for modeling neutron stars. In this article, we review recent developments in chiral effective field theory and focus on many-body perturbation theory as a computationally efficient tool for calculating the properties of hot and dense nuclear matter. We also demonstrate how effective field theory enables statistically meaningful comparisons between nuclear theory predictions, nuclear experiments, and observational constraints on the nuclear equation of state.

    Comments:
    additional references and minor improvements; 31 pages, 8 figures; invited review prepared for Annu. Rev. Nucl. Part. Sci. (2021)
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2101.01709 [pdf]
    Ann.Rev.Nucl.Part.Sci.(2021)·249 citations
  3. 03

    [Submitted on 4 Jan 2021] (cross-list from hep-ph)

    Fast flavor oscillations in dense neutrino media with collisions

    Joshua D. Martin🇺🇸 · J. Carlson🇺🇸 · Vincenzo Cirigliano🇺🇸 · Huaiyu Duan🇺🇸

    We investigate the impact of the nonzero neutrino splitting and elastic neutrino-nucleon collisions on fast neutrino oscillations. Our calculations confirm that a small neutrino mass splitting and the neutrino mass hierarchy have very little effect on fast oscillation waves. We also demonstrate explicitly that fast oscillations remain largely unaffected for the time/distance scales that are much smaller than the neutrino mean free path but are damped on larger scales. This damping originates from both the direct modification of the dispersion relation of the oscillation waves in the neutrino medium and the flattening of the neutrino angular distributions over time. Our work suggests that fast neutrino oscillation waves produced near the neutrino sphere can propagate essentially unimpeded which may have ramifications in various aspects of the supernova physics.

    Comments:
    12 pages, 6 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    2101.01278 [pdf]
    PRD(2021)·80 citations
  4. 04

    [Submitted on 5 Jan 2021] (cross-list from hep-ph)

    Bose-Einstein condensation of pions in proton-proton collisions at the Large Hadron Collider using non-extensive Tsallis statistics

    Suman Deb🇮🇳 · Dushmanta Sahu🇮🇳 · Raghunath Sahoo🇮🇳 · Anil Kumar Pradhan🇮🇳

    The possibility of formation of Bose-Einstein Condensation (BEC) is studied in collisions at = 7 TeV at the Large Hadron Collider. A thermodynamically consistent non-extensive formulation of the identified hadron transverse momentum distributions is used to estimate the critical temperature required to form BEC of charged pions, which are the most abundant species in a multi-particle production process in hadronic and nuclear collisions. The obtained results have been contrasted with the systems produced in Pb-Pb collisions to have a better understanding. We observe an explicit dependency of BEC critical temperature and number of particles in the pion condensates on the non-extensive parameter , which is a measure of degree of non-equilibrium -- as decreases, the critical temperature increases and approaches to the critical temperature obtained from Bose-Einstein statistics without non-extensivity. Studies are performed on the final state multiplicity dependence of number of particles in the pion condensates in a wide range of multiplicity covering hadronic and heavy-ion collisions, using the inputs from experimental transverse momentum spectra.

    Comments:
    Same as the published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2101.01675 [pdf]
    EPJA(2021)·12 citations

Affiliations

first authorsco-authorsvia INSPIRE