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Prog. Theor. Phys. Vol. 115 No. 2 (2006) pp. 355-379

[ Full Text PDF : FREE ACCESS (407K) ]

Occurrence of Hyperon Superfluidity in Neutron Star Cores

Tatsuyuki Takatsuka,1 Shigeru Nishizaki,1 Yasuo Yamamoto2 and Ryozo Tamagaki3

1Faculty of Humanities and Social Sciences,
Iwate University, Morioka 020-8550, Japan
2Physics Section, Tsuru University, Tsuru 402-8555, Japan
3Kamitakano Maeda-Cho 26-5, Kyoto 606-0097, Japan

(Received November 1, 2005)

Abstract:

Superfluidity of Λ and Σ- admixed in neutron star (NS) cores is investigated realistically for hyperon (Y)-mixed NS models obtained using a G-matrix-based effective interaction approach. Numerical results for the equation of state (EOS) with the mixing ratios of the respective components and the hyperon energy gaps including the temperature dependence are presented. These are meant to serve as physical inputs for Y-cooling calculations of NSs. By paying attention to the uncertainties of the EOS and the YY interactions, it is shown that both Λ and Σ- are superfluid as soon as they appear although the magnitude of the critical temperature and the density region where superfluidity exists depend considerably on the YY pairing potential. Considering momentum triangle condition and the occurrence of superfluidity, it is found that a so-called “hyperon cooling”(neutrino-emission from direct Urca process including Y) combined with Y-superfluidity may be able to account for observations of the colder class of NSs. It is remarked that Λ-hyperons play a decisive role in the hyperon cooling scenario. Some comments are given regarding the consequences of the less attractive ΛΛ interaction recently suggested by the “NAGARA event” 6ΛΛHe.


URL : http://ptp.ipap.jp/link?PTP/115/355/
DOI : 10.1143/PTP.115.355

[ Full Text PDF : FREE ACCESS (407K) ] Citation:

References:

  1. T. Takatsuka, S. Nishizaki, Y. Yamamoto and R. Tamagaki, Nucl. Phys. A 691 (2001), 254C.
  2. T. Takatsuka, S. Nishizaki, Y. Yamamoto and R. Tamagaki, Prog. Theor. Phys. Suppl. No. 146 (2002), 279[PTP].
  3. T. Takatsuka, Prog. Theor. Phys. Suppl. No. 156 (2004), 84[PTP].
  4. S. Tsuruta, Comments Astrophys. 11 (1986), 151.
  5. S. Tsuruta, Proc. US-Japan Joint Seminar on “The Structure and Evolution of Neutron Stars”, Kyoto, Japan, 1990, ed. D. Pines, R. Tamagaki and S. Tsuruta (Addison-Wesley, 1992), p. 371.
  6. S. Tsuruta, Phys. Rep. 292 (1998), 1[CrossRef].
  7. H. Umeda, S. Tsuruta and K. Nomoto, Astrophys. J. 433 (1994), 256[CrossRef].
  8. H. Umeda, K. Nomoto, S. Tsuruta, T. Muto and T. Tatsumi, Astrophys. J. 431 (1994), 309[CrossRef].
  9. S. Tsuruta, M. A. Teter, T. Takatsuka, T. Tatsumi and R. Tamagaki, Astrophys. J. 571 (2002), L143[IoP STACKS].
  10. S. Tsuruta, Proc. of the 218th IAU Symposium on “Young Neutron Stars and Their Environments”, Sydney, Australia, July 2003, ed. F. Camilo and B. M. Gaonsler, Vol. 218 (ASP, 2004), p. 21.
  11. C. J. Pethick, Rev. Mod. Phys. 64 (1992), 1133[APS].
  12. M. Prakash, Phys. Rep. 242 (1994), 297[CrossRef].
  13. D. Page and E. Baron, Astrophys. J. 354 (1990), L17[CrossRef].
  14. D. Page and J. Applegate, Astrophys. J. 394 (1992), L17[CrossRef].
  15. Ch. Schaab, D. Voskresensky, A. D. Sedrakian, F. Weber and M. K. Weigel, Astron. Astrophys. 321 (1997), 591.
  16. D. G. Yakovlev, A. D. Kaminker, O. Y. Gnedin and P. Haensel, Phys. Rep. 354 (2001), 1[CrossRef].
  17. D. G. Yakovlev and C. J. Pethick, Annu. Rev. Astron. Astrophys. 42 (2004), 169.
  18. D. Blaschke, H. Grigorin and D. N. Voskresensky, Astron. Astrophys. 424 (2004), 979.
  19. Mad. Prakash, Man. Prakash, J. M. Lattimer and C. J. Pethick, Astrophys. J. 390 (1992), L77[CrossRef].
  20. T. Takatsuka and R. Tamagaki, Prog. Theor. Phys. 102 (1999), 1043[PTP]; Nucl. Phys. A 670 (2000), 222c; Proc. APCTP Workshop on “Strangeness Nuclear Physics” (SNP'99), Seoul, Korea, Feb. 19-22,1999, ed. I-T. Cheon, S-W. Hong and T. Motoba (World Scientific, 2000), p. 337.
  21. T. Takatsuka, S. Nishizaki, Y. Yamamoto and R. Tamagaki, Few-Body Systems Suppl. 12 (2000), 108; Proc. the 10th Int. Conf. “Recent Progress in Many-Body Theories”, Seattle, USA, Sept. 10-15, 1999, ed. R. F. Bishop, K. A. Gernoth, N. R. Walet and Y. Xian, Advances in Quantum Many-Body Theory, 3 (World Scientific, 2000), p. 323; Proc. Int. Symposium on “Origin of Matter and Evolution of Galaxies 2000”, Tokyo, Japan, Jan. 19-21, 2000, ed. T. Kajino, S. Kubono, K. Nomoto and I. Tanihata (World Scientific, 2003), p. 305.
  22. T. Takatsuka, S. Nishizaki, Y. Yamamoto and R. Tamagaki, Prog. Theor. Phys. 105 (2001), 179[PTP].
  23. S. Nishizaki, Y. Yamamoto and T. Takatsuka, Prog. Theor. Phys. 105 (2001), 607[PTP].
  24. T. Takatsuka, S. Nishizaki and Y. Yamamoto, Eur. Phys. J. A 13 (2002), 213[CrossRef].
  25. S. Nishizaki, Y. Yamamoto and T. Takatsuka, Prog. Theor. Phys. 108 (2002), 703[PTP].
  26. M. M. Nagels, T. A. Rijken and J. T. deSwart, Phys. Rev. D 12 (1975), 744[APS]; Phys. Rev. D 15 (1977), 2547[APS]; Phys. Rev. D 20 (1979), 1633[APS].
  27. Y. Yamamoto, S. Nishizaki and T. Takatsuka, Prog. Theor. Phys. 103 (2000), 981[PTP].
  28. S. Nishizaki, T. Takatsuka, N. Yahagi and J. Hiura, Prog. Theor. Phys. 86 (1991), 853[PTP].
  29. S. Nishizaki, T. Takatsuka and J. Hiura, Prog. Theor. Phys. 92 (1994), 93[PTP].
  30. I. E. Lagaris and V. R. Pandharipande, Nucl. Phys. A 369 (1981), 470[CrossRef].
  31. B. Friedman and V. R. Pandharipande, Nucl. Phys. A 361 (1981), 502[CrossRef].
  32. R. B. Wiringa, V. Fiks and A. Fabrocini, Phys. Rev. C 38 (1988), 1010[APS].
  33. A. Akmal, V. R. Pandharipande and D. G. Ravenhall, Phys. Rev. C 58 (1998), 1804[APS].
  34. M. Baldo, G. F. Burgio and H.-J. Schulze, Phys. Rev. C 61 (2000), 055801[APS].
  35. I. Vidana, A. Ramos, L. Engvik and M. Hjorth-Jensen, Phys. Rev. C 62 (2000), 035801[APS].
  36. T. Tanigawa, M. Matsuzaki and S. Chiba, Phys. Rev. C 68 (2003), 015801[APS].
  37. S. Balberg and N. Barnea, Phys. Rev. C 57 (1998), 409[APS].
  38. E. Hiyama, M. Kamimura, T. Motoba, T. Yamada and Y. Yamamoto, Prog. Theor. Phys. 97 (1997), 881[PTP].
  39. T. Ueda, K. Tominaga, M. Yamaguchi, N. Kijima, D. Okamoto, K. Miyagawa and T. Yamada, Prog. Theor. Phys. 99 (1998), 891[PTP].
    K. Tominaga, T. Ueda, M. Yamaguchi, N. Kijima, D. Okamoto, K. Miyagawa and T. Yamada, Nucl. Phys. A 642 (1998), 483[CrossRef].
  40. I. Arisaka, K. Nakagawa, S. Shinmura and M. Wada, Prog. Theor. Phys. 104 (2000), 995[PTP].
  41. M. Danysz et al., Nucl. Phys. 49 (1963), 121[CrossRef].
  42. S. Aoki et al., Prog. Theor. Phys. 85 (1991), 1287[PTP].
  43. Y. Yamamoto, T. Motoba, H. Himeno, K. Ikeda and S. Nagata, Prog. Theor. Phys. Suppl. No. 117 (1994), 361[PTP].
  44. T. Yamada and C. Nakamoto, Phys. Rev. C 62 (2000), 034319[APS].
  45. C. B. Dover, D. J. Millener, A. Gal and D. H. Davis, Phys. Rev. C 44 (1991), 1905[APS].
  46. H. Takahashi et al., Phys. Rev. Lett. 87 (2001), 212502[APS].
  47. R. Tamagaki, Prog. Theor. Phys. 39 (1968), 91[PTP].
  48. T. Takatsuka and R. Tamagaki, Nucl. Phys. A 721 (2003), C1003[CrossRef].
  49. T. Takatsuka and R. Tamagaki, Prog. Theor. Phys. 112 (2004), 37[PTP]; Nucl. Phys. A 738 (2004), 387[CrossRef].
  50. J. M. Lattimer, C. J. Pethick, M. Prakash and P. Haensel, Phys. Rev. Lett. 66 (1991), 2701[APS].
  51. E. Hiyama, M. Kamimura, T. Motoba, T. Yamada and Y. Yamamoto, Phys. Rev. C 66 (2002), 024007[APS].
  52. R. Tamagaki and T. Takatsuka, Soryushiron Kenkyu (Kyoto) 106 (2002), B85.
  53. H. Nemura, Y. Akaishi and Y. Suzuki, Phys. Rev. Lett. 89 (2002), 142504[APS].
  54. Q. N. Usmani, A. R. Bodmer and B. Sharma, Phys. Rev. C 70 (2004), 061001[APS].
  55. T. Takatsuka and R. Tamagaki, Prog. Theor. Phys. 94 (1995), 457[PTP]; Prog. Theor. Phys. 97 (1997), 345[PTP].
  56. T. Takatsuka and R. Tamagaki, Prog. Theor. Phys. Suppl. No. 112 (1993), 107[PTP].
  57. T. Takatsuka and R. Tamagaki, Prog. Theor. Phys. 98 (1997), 393[PTP]; Prog. Theor. Phys. 101 (1999), 1043[PTP].
  58. R. Tamagaki and T. Takatsuka, Prog. Theor. Phys. 115 (2006), 245[PTP].

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  1. Progress of Theoretical Physics Vol. 116 No. 3 (2006) pp. 573-599 :
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  2. Progress of Theoretical Physics Vol. 119 No. 6 (2008) pp. 965-989 :
    Universal Short-Range Repulsion in the Baryon System Originating from the Confinement
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  3. Progress of Theoretical Physics Supplement No. 174 (2008) pp. 233-237 :
    Universal Short-Range Repulsion in the Baryon System Originating from the Confinement
    Ryozo Tamagaki

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