Optimizing relativistic energy density functionals: Covariance analysis
Nikšić T, Paar N, Reinhard PG, Vretenar D (2015)
Publication Type: Journal article
Publication year: 2015
Journal
Book Volume: 42
Article Number: 034008
Journal Issue: 3
DOI: 10.1088/0954-3899/42/3/034008
Abstract
The stability of model parameters for a class of relativistic energy density functionals, characterized by contact (point-coupling) effective inter-nucleon interactions and density-dependent coupling parameters, is analyzed using methods of statistical analysis. A set of pseudo-observables in infinite and semi-infinite nuclear matter (SINM) is used to define a quality measure χ2 for subsequent analysis. Uncertainties of model parameters and correlation coefficients between parameters are computed, and the eigenvectors and eigenvalues of the matrix of second derivatives of χ2 at the minimum are evaluated. Using these quantities, the stability of the density functional in nuclear matter is examined, and weakly and strongly constrained combinations of parameters are determined. In addition, uncertainties of observables that are not included in the calculation of χ2 are analyzed: binding energy of asymmetric nuclear matter, surface thickness of SINM, binding energies and charge radii of finite nuclei.
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APA:
Nikšić, T., Paar, N., Reinhard, P.-G., & Vretenar, D. (2015). Optimizing relativistic energy density functionals: Covariance analysis. Journal of Physics G: Nuclear and Particle Physics, 42(3). https://doi.org/10.1088/0954-3899/42/3/034008
MLA:
Nikšić, T., et al. "Optimizing relativistic energy density functionals: Covariance analysis." Journal of Physics G: Nuclear and Particle Physics 42.3 (2015).
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