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Kaon condensation and lambda–nucleon loop in the relativistic mean-field approach |
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| Authors: | Tomoyuki Maruyama Takumi Muto Toshitaka Tatsumi Kazuo Tsushima Anthony W. Thomas |
| Affiliation: | aInstitute for Nuclear Theory, University of Washington, Seattle, WA 98195, USA bCollege of Bioresource Science, Nihon University, Fujisawa 252-8510, Japan cJapan Atomic Energy Research Institute, Tokai 319-1195, Japan dChiba Institute of Technology, Narashino, Chiba 275-0023, Japan eDepartment of Physics, Kyoto University, Kyoto 606-8502, Japan fInstituto de Física Teórica, UNESP, 01405-900, Sao Paulo, Brazil gMackenzie University, FCBEE, 01302-907, Sao Paulo, Brazil hNational Center for Theoretical Sciences at Taipei, Taipei 10617, Taiwan iJefferson Laboratory, 12000 Jefferson Ave., Newport News, VA 23606, USA |
| Abstract: | The possibility of kaon condensation in high-density symmetric nuclear matter is investigated including both s- and p-wave kaon–baryon interactions within the relativistic mean-field (RMF) theory. Above a certain density, we have a collective state carrying the same quantum numbers as the antikaon. The appearance of the state is caused by the time component of the axial-vector interaction between kaons and baryons. It is shown that the system becomes unstable with respect to condensation of K– pairs. We consider how the effective baryon masses affect the kaon self-energy coming from the time component of the axial-vector interaction. Also, the role of the spatial component of the axial-vector interaction on the possible existence of the collective kaonic states is discussed in connection with Λ-mixing effects in the ground state of high-density matter. Implications of condensation for high-energy heavy-ion collisions are briefly mentioned. |
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