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Dynamics of kaons and hyperons in neutron star matter

Research Project

Project/Area Number 13640282
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 素粒子・核・宇宙線
Research InstitutionKyoto University

Principal Investigator

TATSUMI Toshitaka  KYOTO UNIVERSITY Graduate school of Science, Assistant, 大学院・理学研究科, 助手 (40155099)

Co-Investigator(Kenkyū-buntansha) MARUYAMA Tomoyuki  Nihon Univ.College of Bioresource Sciences, Associate Professor, 生物資源科学部, 助教授 (50318391)
Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2003: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2002: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2001: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsHigh-density nuclear matter / Compact stars / Kaon Condensation / First order phase transition / Coulomb screening / Quark matter / Ferromagnetism / Color superconductivity / 一次相転移での混合相 / 高エネルギー重イオン反応 / Λハイペロン / 中性子星 / 中性子星冷却 / ニュートリノ / π中間子凝縮 / クォーク星 / 遅延崩壊 / ニュートリノ不透明度
Research Abstract

Main researches in this year are the Coulomb screening and the possibility of the structured mixed phase in the first order phase transitions such as kaon con densation and the possibility of kaon condensation in nuclear matter and its implication on the kaon anomalous production in high-energy heavy ion reactions. Moreover, we studied ferromagnetism and color superconductivity in high-density quark matter. As for the issue of the mixed phase in the first order phase transit ions we studied the Coulomb screening effect and particle density profiles consi stently by numerically solving the equations of motion given by the density functional theory. Our results show that the geometrical structures in the mixed phase becomes mechanically unstable by the screening effect, and thereby the density region of the mixed phase is largely limited. This is consistent with the pre vious results given by the semi-quantitative treatment in the context of hadron-quark deconfinement transition. These r … More esults have been already presented in the international conferences. We are now checking the details of the calculations and preparing a paper.
As for kaon condensation in nuclear matter, we calculated the kaon self-energy term given by the lambda particle-nucleon hole state and found usual nuclear matter becomes unstable for the pair formation of kaon and the lambda particle-nucleon hole collective state with the quantum number of anti-kaon at certain density. This is the different mechanism from the previous study about kaon condensation, where the lambda particle and kaon are produced simultaneously. The critical density in the present study is very much lowered than the previous one, and there by we expect a strong implication on heavy-ion experiments. We are now preparing a paper on this subject.
Besides these works we studied magnetism in quark matter and its coexistence with color superconductivity. Some results have been presented in the international conferences and we are now preparing a paper. Less

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (38 results)

All Other

All Publications (38 results)

  • [Publications] E.Nakano: "Spin polarization and color superconductivity in quark matter"Phys.Rev.. D68. 105001 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Tatsumi: "Neutrino interactions in octet baryon matter"Prog.Theor.Phys.. 110. 179-184 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Tatsumi: "Possibility of color magnetic superconductivity"Proc.of NATO Advanced Institute, "Superdense QCD matter and compact stars". (In press). (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Tatsumi: "Ferromagnetism and superconductivity in quark matter-Color magnetic superconductivity"Proc.of Int.Sympo., "Finite density QCD". (In press). (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Maruyama: "Ferromagnetism of Nuclear Matter in the Relativistic Approach"Nucl.Phys.. A721. 265c-268c (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Maruyama: "Kaon condensation and the non-uniform nuclear matter"Prog.Theor.Phys.Suppl.. (In press). (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] E.Nakano, T.Maruyama, T.Tatsumi: "Spin Polarization and Color Superconductivity in Quark Matter"Phys.Rev.. D68. 105001 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Tatsumi, T.Takatsuka, R.Tamagaki: "Neutrino interactions in octet baryon matter"Prog.Theor.Phys.. 110. 179 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Tatsumi, T.Maruyama, E.Nakano: "Possibility of colon magnetic superconductivity"Proc.of NATO Advanced Study Institute. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Tatsumi, T.Maruyama, E.Nakano: "Ferromagnetism and superconductivity in quark matter Color magnetic superconductivity"Proc.of FQGD. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Maruyama, T.Tatsumi: "Ferromagnetism of Nuclear Matter in the Relativistic Approach"Nucl.Phys.. A721. 265c-268c (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Maruyama et al.: "Kaon condensation and the non-uniform nuclear matter"Prog.Theor.Phys.Suppl.. (in press). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Tatsumi: "Neutrino interactions in octet baryon matter"Prog.Theor.Phys.. 110. 179 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] E.Nakano: "Spin polarization and color superconductivity in quark matter"Phys.Rev.. D68. 105001 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Maruyama: "In-medium effects in the eta-production through the S11 resonance in the relativistic approach"Prog.Ther.Phys.. 111(In press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Tatsumi: "Ferromagnetism and superconductivity in quark matter-Color magnetic superconductivity"Supplement of Prog.Theor.Phys.. (In press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Tatsumi: "Possibility of color magnetic superconductivity"Proc.of NATO Advanced Study Institute. (In press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Tatsumi: "Screening effect in quark-hadron mixed phase"Proc.of OMEG03. (In press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Maruyama: "Coulomb screening effect on the nuclear-pasta structure"Proc.of OMEG03. (In press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Tatsumi: "Quark matter and compact stars"Proc.of Matter03 (Prog.Theor.Phys.Supplement). (In press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Maruyama: "Kaon condensation and the non-uniform nuclear matter"Proc.of Matter03 (Prog.Theor.Phys.Supplement). (In press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] D.N.Voskresensky: "Charge screening at first order phase transitions"Phys. Lett.. B541. 93-100 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] S.Tsuruta: "Confronting neutron star cooling theories with new observations"ApJ.. 571. L143-L146 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] D.N.Voskresensky: "Charge Screening at First Order Phase Transitions and Hadron-Quark Mixed Phase"Nucl. Phys. A. (In press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Muto: "Neutrino opacities in neutron stars with kaon condensates"Phys. Rev. D. (In press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 巽 敏隆: "クォーク星のきらめき"数理科学5月号. (In press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Tatsumi: "Delayed collapse of protoneutron stars by kaon condensate"Proc. of Int. Nuclear Physics Conf.(INPC2001), American Inst. of Physics. 475-479 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Tatsumi: "Physics of High-Density Nuclear Matter at JHF"KEK Proceedings. 13. 66-72 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Maruyama: "Ferromagnetism of Nuclear Matter in the Relativistic Approach"Proc. of Int. Conf. of PANICO2, Nucl. Phys. A. (In press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Tatsumi: "Hadron-quark mixed phase in neutron stars"Proc. of 7th Int. Sympo. of "Nuclei in the Cosmos"(NIC7) Nucl.Phys.A. (In press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Tatsumi: "Pseudoscalar Mesons in Nuclear Medium"Proc. of "MEDIUM02". (In press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Maruyama: "Eta Photoproduction in the Relativistic Approach"Proc. of Int. Conf. of PANICO2, Nucl.Phys.A. (In press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Maruyama: "Time-dependent Dynamics of the Bose-Fermi Mixed Condensed System"Proc. of Int. Conf. CM2002, WS. (In press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Yasuhira: "Protoneutron stars with kaon condensation and their delayed collapse"Nucl. Phys.. A690. 769-789 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Maruyama: "Ferromagnetism of nuclear matter in the relativistic approach"Nucl. Phys.. A693. 710-730 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] M.Nakano: "Pion condensation based on relativistic description of particle-hole excitations"Int. J. Mod. Phys.. E(In press). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Tatsumi: "Delayed collapse of Protoneutron stars by Kaon Condensate"Proc. of INPC 2001. (In press). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] 巽 敏隆: "クォーク物質は中性子星の描像をいかに変更するか?"原子核研究. Vol.46 No4. 35-72 (2002)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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