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Scalar field, nucleon structure and relativistic chiral theory for nuclear matter

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Abstract

The work that Peter Schuck and I carried out during the nineties in collaboration with the Lyon and Darmstadt theory groups is summarized. I retrace how our theoretical developments combined with experimental results concerning the in-medium modification of the pion-pion interaction allowed a clarification of the chiral status of the sigma meson introduced in relativistic theories of nuclear matter. This enabled us to build a relativistic chiral theory, now called the chiral confining model of nuclear matter, which includes the effect of the nucleon substructure, namely the response of the nucleon to the nuclear scalar field generating an efficient and natural contribution to the saturation mechanism. Using parameters from a QCD-connected version of the chiral confining model, I describe the relative roles of the chiral scalar field and two-pion (or two-rho) exchange for the in-medium NN attractive interaction and the associated sources of three-body interactions needed for the saturation mechanism.

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Data availability statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: This manuscript has no associated data. This is a theoretical study and no experimental data.]

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Acknowledgements

I acknowledge my long term collaborators, M. Ericson, M. Martini, D. Davesne, H. Hansen and also more recent ones, J. Margueron and M. Chamsedinne, who where involved at various stages of the theoretical developments described in this paper.

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Authors and Affiliations

  1. Univ Claude Bernard Lyon 1, CNRS/IN2P3, IP2I Lyon, UMR 5822, 69622, Villeurbanne, France

    Guy Chanfray

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  1. Guy Chanfray
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Correspondence to Guy Chanfray.

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Communicated by David Blaschke

Dedicated to the memory of Peter Schuck.

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Chanfray, G. Scalar field, nucleon structure and relativistic chiral theory for nuclear matter. Eur. Phys. J. A 60, 7 (2024). https://doi.org/10.1140/epja/s10050-023-01221-2

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