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Nuclear Theory·nucl-th

Wednesday·May 2, 2018

9 papers—5 primary·4 cross-listed

All9Primary5Cross-lists4
  1. 06

    [Submitted on 30 Apr 2018] (cross-list from hep-ph)

    Freeze-out temperature from net-Kaon fluctuations at RHIC

    R. Bellwied🇺🇸 · J. Noronha-Hostler🇺🇸 · P. Parotto🇺🇸 · I. Portillo Vazquez🇺🇸 · C. Ratti🇺🇸 · J. M. Stafford🇺🇸

    We compare the mean-over-variance ratio of the net-kaon distribution calculated within a state-of-the-art hadron resonance gas model to the latest experimental data from the Beam Energy Scan at RHIC by the STAR collaboration. Our analysis indicates that it is not possible to reproduce the experimental results using the freeze-out parameters from the existing combined fit of net-proton and net-electric charge mean-over-variance. The strange mesons need about 10-15 MeV higher temperatures than the light hadrons at the highest collision energies. In view of the future fluctuation measurements, we predict the variance-over-mean and skewness-times-variance at the light and strange chemical freeze-out parameters. We observe that the fluctuations are sensitive to the difference in the freeze-out temperatures established in this analysis. Our results have implications for other phenomenological models in the field of relativistic heavy ion collisions.

    Comments:
    5 pages, 3 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1805.00088 [pdf]
    PRC(2019)·69 citations
  2. 07

    [Submitted on 30 Apr 2018] (cross-list from hep-lat)

    Spin Polarized Non-Relativistic Fermions in 1+1 Dimensions

    Andrei Alexandru🇺🇸 · Paulo F. Bedaque🇺🇸 · Neill C. Warrington🇺🇸

    We study by Monte Carlo methods the thermodynamics of a spin polarized gas of non-relativistic fermions in 1+1 dimensions. The main result of this work is that our action suffers no significant sign problem for any spin polarization in the region relevant for dilute degenerate fermi gases. This lack of sign problem allows us to study attractive spin polarized fermions non-perturbatively at spin polarizations not previously explored. For some parameters values we verify results previously obtained by methods which include an uncontrolled step like complex Langevin and/or analytical continuation from imaginary chemical potential. For others, larger values of the polarization, we deviate from these previous results.

    Comments:
    9 pages, 5 figures
    Subjects:
    High Energy Physics — Lattice (hep-lat); Quantum Gases (cond-mat.quant-gas); Nuclear Theory (nucl-th)
    arXiv:
    1805.00125 [pdf]
    PRD(2018)·20 citations
  3. 08

    [Submitted on 1 May 2018] (cross-list from physics.data-an)

    A general procedure for detector-response correction of higher order cumulants

    Toshihiro Nonaka🇨🇳 · Masakiyo Kitazawa🇯🇵 · ShinIchi Esumi🇯🇵

    We propose a general procedure for the detector-response correction (including efficiency correction) of higher order cumulants observed by the event-by-event analysis in heavy-ion collisions. This method makes use of the moments of the response matrix characterizing the property of a detector, and is applicable to a wide variety of response matrices such as those having non-binomial responses and including the effects of ghost tracks. A procedure to carry out the detector-response correction of realistic detectors is discussed. In test analyses, we show that this method can successfully re- construct the cumulants of true distribution for various response matrices including the one having multiplicity-dependent efficiency.

    Comments:
    10 pages, 5 figures
    Subjects:
    Data Analysis, Statistics and Probability (physics.data-an); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1805.00279 [pdf]
    Nucl.Instrum.Meth.A(2018)·25 citations
  4. 09

    [Submitted on 29 Apr 2018] (cross-list from astro-ph.HE)

    Modeling magnetic neutron stars: a short overview

    R.O. Gomes🇩🇪 · S. Schramm🇩🇪 · V. Dexheimer🇺🇸

    Neutron stars are the endpoint of the life of intermediate mass stars and posses in their cores matter in the most extreme conditions in the universe. Besides their extremes of temperature (found in proto-neutron stars) and densities, typical neutron star' magnetic fields can easily reach trillions of times higher the one of the Sun. Among these stars, about are denominated \emph{magnetars} which possess even stronger surface magnetic fields of up to . In this conference proceeding, we present a short review of the history and current literature regarding the modeling of magnetic neutron stars. Our goal is to present the results regarding the introduction of magnetic fields in the equation of state of matter using Relativistic Mean Field models (RMF models) and in the solution of Einstein's equations coupled to the Maxwell's equations in order to generate a consistent calculation of magnetic stars structure. We discuss how equation of state modeling affects mass, radius, deformation, composition and magnetic field distribution in stars and also what are the open questions in this field of research.

    Comments:
    Poster presented at the XIV International Workshop on Hadron Physics, Florianópolis, Brazil, March 2018
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    1805.00341 [pdf]
    3 citations

Affiliations

first authorsco-authorsvia INSPIRE