“Sloppy” nuclear energy density functionals: Effective model reduction

Znanstveni rad - Izvorni znanstveni rad

• Autor: Tamara Nikšić; MBZ: 234533
• Autor: Dario Vretenar; MBZ: 9570
• Autorova ustanova: Sveučilište u Zagrebu; Prirodoslovno-matematički fakultet; (Fizički odsjek)
• Znanstveno / umjetničko područje, polje i grana: PRIRODNE ZNANOSTI; Fizika

Sažetak (engleski)

Concepts from information geometry are used to analyze parameter sensitivity for a nuclear energy density functional, representative of a class of semiempirical functionals that start from a microscopically motivated ansatz for the density dependence of the energy of a system of protons and neutrons. It is shown that such functionals are “sloppy, ” namely, characterized by an exponential range of sensitivity to parameter variations. Responsive to only a few stiff parameter combinations, sloppy functionals exhibit an exponential decrease of sensitivity to variations of the remaining soft parameters. By interpreting the space of model predictions as a manifold embedded in the data space, with the parameters of the functional as coordinates on the manifold, it is also shown that the exponential distribution of model manifold widths corresponds to the range of parameter sensitivity. Using the manifold boundary approximation method, we illustrate how to systematically construct effective nuclear density functionals of successively lower dimension in parameter space until sloppiness is eventually eliminated and the resulting functional contains only stiff combinations of parameters.

• Ključne riječi (engleski): nuclear energy density functions; information geometry; manifold boundary approximation method
• Jezik: engleski
• Vrsta publikacije: Znanstveni rad - Izvorni znanstveni rad
• Status objave: Objavljen
• Vrsta recenzije: Recenziran - međunarodna recenzija
• Verzija publikacije: Objavljena verzija rada (izdavačev PDF)
• Naslov časopisa: Physical Review C
• Brojčani podaci: vol. 94, br. 2, 024333
• p-ISSN: 2469-9985
• DOI: https://doi.org/10.1103/PhysRevC.94.024333
• URN:NBN: urn:nbn:hr:217:392049
• Datum objave publikacije: 2016
• Projekt: Šifra: IP-2014-09-9159; Naziv (hrvatski): Struktura i dinamika egzotičnih femto-sustava; Kratica: STRUDEF; Voditelj: Nils Paar; Pravna nadležnost: Hrvatska; Financijer: HRZZ; Linija financiranja: IP
• URL dokumenta: https://journals.aps.org/prc/abstract/10.1103/PhysRevC.94.024333
• Vrsta resursa: Tekst
• Prava pristupa: Otvoreni pristup
• Javna napomena: © 2016 American Physical Society. Received 28 June 2016; published 24 August 2016.
• Datum i vrijeme pohrane: 2020-02-23 19:21:50