| NUCLEAR PHYSICS |
|
|
|
|
Hyperon Effects on the Spin Parameter of Rotating Neutron Stars |
| QI Bin1, ZHANG Nai-Bo1, WANG Shou-Yu1, SUN Bao-Yuan2,3** |
1Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209
2School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000
3Key Laboratory of Special Function Materials and Structure Design of Ministry of Education, Lanzhou 730000
|
|
| Cite this article: |
|
QI Bin, ZHANG Nai-Bo, WANG Shou-Yu et al 2015 Chin. Phys. Lett. 32 112101 |
|
|
|
|
Abstract Based on the equations of state from the relativistic mean field theory without and with the inclusion of strangeness-bearing hyperons, we study the dimensionless spin parameter j=cJ/(GM2) of uniformly rotating neutron stars. It is shown that the maximum value of the spin parameter jmax of a neutron star rotating at the Keplerian frequency fK is jmax～0.7 when the star mass M >0.5 M?, which is sustained for various versions of equations of state without and with hyperons. The relationship between j and the scaled rotation frequency f/fK is found to be insensitive to the star mass or the adopted equation of state in the models without hyperons. However, the emergence of hyperons in neutron stars will lead to an uncertainty of the spin parameter j, which in turn could generate a complexity in the theoretical study of the quasi-periodic oscillations observed in disk-accreting compact-star systems.
|
|
|
Received: 14 August 2015
Published: 01 December 2015
|
|
| PACS: |
21.30.Fe
|
(Forces in hadronic systems and effective interactions)
|
| |
21.60.Jz
|
(Nuclear Density Functional Theory and extensions (includes Hartree-Fock and random-phase approximations))
|
| |
26.60.-c
|
(Nuclear matter aspects of neutron stars)
|
| |
97.60.Jd
|
(Neutron stars)
|
|
|
|
|
|
[1] Backer D C, Kulkarni S R, Heiles C et al 1982 Nature 300 615
[2] Hessels J W T, Ransom S M, Stairs I H, Freire P C C, Kaspi V M and Camilo F 2006 Science 311 1901
[3] Kaaret P, Prieskorn Z, in 't Zand J J M, Brandt S, Lund N, Mereghetti S, G?tz D, Kuulkers E and Tomsick J A 2007 Astrophys. J. Lett. 657 L97
[4] Stergioulas N 2003 Living Rev. Relativ. 6 3
[5] Cook G B, Shapiro S L and Teukolsky S A 1994 Astrophys. J. 424 823
[6] Koranda S, Stergioulas N and Friedman J L 1997 Astrophys. J. 488 799
[7] Haensel P, Zdunik J L, Bejger M and Lattimer J M 2009 Astron. Astrophys. 502 605
[8] Lo K W and Lin L M 2011 Astrophys. J. 728 12
[9] Miller M C, Lamb F K and Psaltis D 1998 Astrophys. J. 508 791
[10] Lattimer J M and Prakash M 2007 Phys. Rep. 442 109
[11] Cipolletta F, Cherubini C, Filippi S, Rueda J A and Ruffini R 2015 Phys. Rev. D 92 023007
[12] Walecka J D 1974 Ann. Phys. (N. Y.) 83 491
[13] Serot B D and Walecka J D 1986 Adv. Nucl. Phys. 16 1
[14] Meng J, Toki H, Zhou S G, Zhang S Q, Long W H and Geng L S 2006 Prog. Part. Nucl. Phys. 57 470
[15] Glendenning N K 2000 Compact Stars, Nuclear Physics, ParticlePhysics and General Relativity 2nd edn (New York: Springer-Verlag)
[16] Hofmann F, Keil C M and Lenske H 2001 Phys. Rev. C 64 025804
[17] Ban S F, Li J, Zhang S Q, Jia H Y, Sang J P and Meng J 2004 Phys. Rev. C 69 045805
[18] Serot B D 1979 Phys. Lett. B 86 146
[19] Sumiyoshi K, Kuwabara H and Toki H 1995 Nucl. Phys. A 581 725
[20] Sun B Y, Long W H, Meng J and Lombardo U 2008 Phys. Rev. C 78 065805
[21] Zhao X F 2010 Chin. Phys. Lett. 27 099701
[22] Xu Y, Liu G Z, Wang H Y, Ding W B and Zhao E G 2012 Chin. Phys. Lett. 29 059701
[23] Ouyang F, Liu B B and Chen W 2013 Chin. Phys. Lett. 30 092101
[24] Xu Y, Liu G Z, Liu C, Fan C B, Wang H Y, Zhu M F and Zhao E G 2013 Chin. Phys. Lett. 30 129501
[25] Ding W B, E S S, Yu Z, Zhang Q and Qi Z Q 2015 Chin. Phys. Lett. 32 059701
[26] Sugahara Y and Toki H 1994 Prog. Theor. Phys. 92 803
[27] Glendenning N K 1985 Astrophys. J. 293 470
[28] Schaffner J and Mishustin I N 1996 Phys. Rev. C 53 1416
[29] Long W H, Sun B Y, Hagino K and Sagawa H 2012 Phys. Rev. C 85 025806
[30] Prakash M, Bombaci I, Prakash M, Ellis P J, Lattimer J M and Knorren R 1997 Phys. Rep. 280 1
[31] Yu Z, Ding W B, Bao T and Liu N N 2011 Chin. Phys. Lett. 28 089701
[32] Zhang N B, Qi B, Wang S Y, Ge S L and Sun B Y 2013 Int. J. Mod. Phys. E 22 1350085
[33] Nozawa T, Stergioulas N, Gourgoulhon E and Eriguchi Y 1998 Astron. Astrophys. Suppl. Ser. 132 431
[34] Stergioulas N and Friedman J L 1995 Astrophys. J. 444 306
[35] Typel S and Wolter H H 1999 Nucl. Phys. A 656 331
[36] Long W H, Meng J, Van Giai N and Zhou S G 2004 Phys. Rev. C 69 034319
[37] Lalazissis G A, Nik?i? T, Vretenar D and Ring P 2005 Phys. Rev. C 71 024312
[38] Moszkowski S A 1974 Phys. Rev. D 9 1613 |
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
