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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Relativistic mean-field hadronic models under nuclear matter constraints

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Author(s):
Dutra, M. [1] ; Lourenco, O. [2] ; Avancini, S. S. [3] ; Carlson, B. V. [4] ; Delfino, A. [5] ; Menezes, D. P. [6, 7] ; Providencia, C. [8] ; Typel, S. [9] ; Stone, J. R. [10, 11]
Total Authors: 9
Affiliation:
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[1] Univ Fed Fluminense, Dept Fis & Matemat, ICT, BR-28895532 Rio De Janeiro - Brazil
[2] Univ Fed Sao Carlos, Dept Ciencias Nat Matemat & Educ, CCA, BR-13600970 Sao Paulo - Brazil
[3] Univ Fed Santa Catarina, Dept Fis, CFM, BR-88040900 Florianopolis, SC - Brazil
[4] Inst Tecnol Aeronaut, Dept Fis, CTA, BR-12228900 Sao Paulo - Brazil
[5] Univ Fed Fluminense, Dept Fis, BR-24210150 Niteroi, RJ - Brazil
[6] Univ Fed Santa Catarina, Dept Fis, BR-88040900 Florianopolis, SC - Brazil
[7] Univ Alicante, Dept Fis Aplicada, E-03080 Alicante - Spain
[8] Univ Coimbra, Dept Phys, Ctr Fis Computac, P-3004516 Coimbra - Portugal
[9] GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt - Germany
[10] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 - USA
[11] Univ Oxford, Oxford Phys, Oxford OX1 3PU - England
Total Affiliations: 11
Document type: Journal article
Source: Physical Review C; v. 90, n. 5 NOV 10 2014.
Web of Science Citations: 128
Abstract

Background: The microscopic composition and properties of infinite hadronic matter at a wide range of densities and temperatures have been subjects of intense investigation for decades. The equation of state (EoS) relating pressure, energy density, and temperature at a given particle number density is essential for modeling compact astrophysical objects such as neutron stars, core-collapse supernovae, and related phenomena, including the creation of chemical elements in the universe. The EoS depends not only on the particles present in the matter, but, more importantly, also on the forces acting among them. Because a realistic and quantitative description of infinite hadronic matter and nuclei from first principles in not available at present, a large variety of phenomenological models has been developed in the past several decades, but the scarcity of experimental and observational data does not allow a unique determination of the adjustable parameters. Purpose: It is essential for further development of the field to determine the most realistic parameter sets and to use them consistently. Recently, a set of constraints on properties of nuclear matter was formed and the performance of 240 nonrelativistic Skyrme parametrizations was assessed {[}M. Dutra et al., Phys. Rev. C 85, 035201 (2012)] in describing nuclear matter up to about three times nuclear saturation density. In the present work we examine 263 relativistic-mean-field (RMF) models in a comparable approach. These models have been widely used because of several important aspects not always present in nonrelativistic models, such as intrinsic Lorentz covariance, automatic inclusion of spin, appropriate saturation mechanism for nuclear matter, causality, and, therefore, no problems related to superluminal speed of sound in medium. Method: Three different sets of constraints related to symmetric nuclear matter, pure neutron matter, symmetry energy, and its derivatives were used. The first set (SET1) was the same as used in assessing the Skyrme parametrizations. The second and third sets (SET2a and SET2b) were more suitable for analysis of RMF and included, up-to-date theoretical, experimental and empirical information. Results: The sets of updated constraints (SET2a and SET2b) differed somewhat in the level of restriction but still yielded only 4 and 3 approved RMF models, respectively. A similarly small number of approved Skyrme parametrizations were found in the previous study with Skyrme models. An interesting feature of our analysis has been that the results change dramatically if the constraint on the volume part of the isospin incompressibility (K-t,K- v) is eliminated. In this case, we have 35 approved models in SET2a and 30 in SET2b. Conclusions: Our work provides a new insight into application of RMF models to properties of nuclear matter and brings into focus their problematic proliferation. The assessment performed in this work should be used in future applications of RMF models. Moreover, the most extensive set of refined constraints (including nuclear matter and finite-nuclei-related properties) should be used in future determinations of new parameter sets to provide models that can be used with more confidence in a wide range of applications. Pointing to reasons for the many failures, even of the frequently used models, should lead to their improvement and to the identification of possible missing physics not included in present energy density functionals. (AU)

FAPESP's process: 09/00069-5 - Few-body aspects of many-body physics
Grantee:Tobias Frederico
Support type: Research Projects - Thematic Grants