Structure of the vacuum in nuclear matter: a nonperturbative approach

  • We compute the vacuum polarization correction to the binding energy of nuclear matter in the Walecka model using a nonperturbative approach. We first study such a contribution as arising from a ground-state structure with baryon-antibaryon condensates. This yields the same results as obtained through the relativistic Hartree approximation of summing tadpole diagrams for the baryon propagator. Such a vacuum is then generalized to include quantum effects from meson fields through scalar-meson condensates which amounts to summing over a class of multiloop diagrams. The method is applied to study properties of nuclear matter and leads to a softer equation of state giving a lower value of the incompressibility than would be reached without quantum effects. The density-dependent effective sigma mass is also calculated including such vacuum polarization effects.

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Author:Amruta Mishra, P. K. Panda, Stefan SchrammGND, Joachim ReinhardtGND, Walter GreinerGND
Parent Title (English):Physical review. C, Nuclear physics
Place of publication:Woodbury, NY
Document Type:Article
Year of Completion:1997
Date of first Publication:1997/02/03
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2006/07/14
Volume:3.Ser. 56
Page Number:9
First Page:1380
Last Page:1388
©1997 American Physical Society
Source:Physical Review C 56(3), S. 1380-1388 (1997), ©1997 The American Physical Society,
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
PACS-Classification:20.00.00 NUCLEAR PHYSICS / 21.00.00 Nuclear structure (for nucleon structure, see 14.20.Dh Properties of protons and neutrons; 13.40.-f for electromagnetic processes and properties; 13.60.Hb for deep-inelastic structure functions) / 21.30.-x Nuclear forces (see also 13.75.Cs Nucleon-nucleon interactions)
Licence (German):License LogoDeutsches Urheberrecht