Hyperons, deconfinement, and the speed of sound in neutron stars

被引：6

作者：

Aguirre, R. M. ^{[1
,2
]}

机构：

[1] Univ Nacl La Plata, CONICET, Dept Fis, Fac Ciencias Exactas, CC 67 1900, La Plata, Argentina

[2] IFLP, UNLP, CONICET, CC 67 1900, La Plata, Argentina

来源：

PHYSICAL REVIEW D | 2022年 / 105卷 / 11期

关键词：

NUCLEAR-MATTER; MASS;

D O I：

10.1103/PhysRevD.105.116023

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The effects on the speed of sound in neutron stars due to the presence of hyperons and a phase transition to deconfined quark matter is investigated. For this purpose a composite description within the covariant field theory is used; it consists of different models for the hadronic and for the unbound quark configurations. A phase transition with continuous and monotonous variation of the equation of state is assumed. The predictions obtained are contrasted with recent observational data on isolated neutron stars as well as on binary systems. Only one candidate is finally obtained from six different descriptions. According to the present calculations, the onset of the hyperons causes the equilibrium speed of sound to exceed the conformal limit. Based on recent works on the propagation of g-modes in neutron stars, different definitions of the speed of sound are considered.

引用

页数：14

共 62 条

[1] GW170817: Measurements of Neutron Star Radii and Equation of State [J].

Abbott, B. P. ;

Abbott, R. ;

Abbott, T. D. ;

Acernese, F. ;

Ackley, K. ;

Adams, C. ;

Adams, T. ;

Addesso, P. ;

Adhikari, R. X. ;

Adya, V. B. ;

Affeldt, C. ;

Agarwal, B. ;

Agathos, M. ;

Agatsuma, K. ;

Aggarwal, N. ;

Aguiar, O. D. ;

Aiello, L. ;

Ain, A. ;

Ajith, P. ;

Allen, B. ;

Allen, G. ;

Allocca, A. ;

Aloy, M. A. ;

Altin, P. A. ;

Amato, A. ;

Ananyeva, A. ;

Anderson, S. B. ;

Anderson, W. G. ;

Angelova, S. V. ;

Antier, S. ;

Appert, S. ;

Arai, K. ;

Araya, M. C. ;

Areeda, J. S. ;

Arene, M. ;

Arnaud, N. ;

Arun, K. G. ;

Ascenzi, S. ;

Ashton, G. ;

Ast, M. ;

Aston, S. M. ;

Astone, P. ;

Atallah, D. V. ;

Aubin, F. ;

Aufmuth, P. ;

Aulbert, C. ;

AultONeal, K. ;

Austin, C. ;

Avila-Alvarez, A. ;

Babak, S. .

PHYSICAL REVIEW LETTERS, 2018, 121 (16)

[2] GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral [J].

Abbott, B. P. ;

Abbott, R. ;

Abbott, T. D. ;

Acernese, F. ;

Ackley, K. ;

Adams, C. ;

Adams, T. ;

Addesso, P. ;

Adhikari, R. X. ;

Adya, V. B. ;

Affeldt, C. ;

Afrough, M. ;

Agarwal, B. ;

Agathos, M. ;

Agatsuma, K. ;

Aggarwal, N. ;

Aguiar, O. D. ;

Aiello, L. ;

Ain, A. ;

Ajith, P. ;

Allen, B. ;

Allen, G. ;

Allocca, A. ;

Altin, P. A. ;

Amato, A. ;

Ananyeva, A. ;

Anderson, S. B. ;

Anderson, W. G. ;

Angelova, S. V. ;

Antier, S. ;

Appert, S. ;

Arai, K. ;

Araya, M. C. ;

Areeda, J. S. ;

Arnaud, N. ;

Arun, K. G. ;

Ascenzi, S. ;

Ashton, G. ;

Ast, M. ;

Aston, S. M. ;

Astone, P. ;

Atallah, D. V. ;

Aufmuth, P. ;

Aulbert, C. ;

AultONeal, K. ;

Austin, C. ;

Avila-Alvarez, A. ;

Babak, S. ;

Bacon, P. ;

Bader, M. K. M. .

PHYSICAL REVIEW LETTERS, 2017, 119 (16)

[3] Properties of the Binary Neutron Star Merger GW170817 [J].

Abbott, B. P. ;

Abbott, R. ;

Abbott, T. D. ;

Acernese, F. ;

Ackley, K. ;

Adams, C. ;

Adams, T. ;

Addesso, P. ;

Adhikari, R. X. ;

Adya, V. B. ;

Affeldt, C. ;

Agarwal, B. ;

Agathos, M. ;

Agatsuma, K. ;

Aggarwal, N. ;

Aguiar, O. D. ;

Aiello, L. ;

Ain, A. ;

Ajith, P. ;

Allen, B. ;

Allen, G. ;

Allocca, A. ;

Aloy, M. A. ;

Altin, P. A. ;

Amato, A. ;

Ananyeva, A. ;

Anderson, S. B. ;

Anderson, W. G. ;

Angelova, S., V ;

Antier, S. ;

Appert, S. ;

Arai, K. ;

Araya, M. C. ;

Areeda, J. S. ;

Arene, M. ;

Arnaud, N. ;

Arun, K. G. ;

Ascenzi, S. ;

Ashton, G. ;

Ast, M. ;

Aston, S. M. ;

Astone, P. ;

Atallah, D., V ;

Aubin, F. ;

Aufmuth, P. ;

Aulbert, C. ;

AultONeal, K. ;

Austin, C. ;

Avila-Alvarez, A. ;

Babak, S. .

PHYSICAL REVIEW X, 2019, 9 (01)

[4] Compact stars with color superconducting quark matter [J].

Alford, M ;

Reddy, S .

PHYSICAL REVIEW D, 2003, 67 (07)

[5] Generic conditions for stable hybrid stars [J].

Alford, Mark G. ;

Han, Sophia ;

Prakash, Madappa .

PHYSICAL REVIEW D, 2013, 88 (08)

[6] Evidence for a maximum mass cut-off in the neutron star mass distribution and constraints on the equation of state [J].

Alsing, Justin ;

Silva, Hector O. ;

Berti, Emanuele .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2018, 478 (01) :1377-1391

[7] Quark matter in neutron stars within the Nambu-Jona-Lasinio model and confinement [J].

Baldo, M. ;

Burgio, G. F. ;

Castorina, P. ;

Plumari, S. ;

Zappala, D. .

PHYSICAL REVIEW C, 2007, 75 (03)

[8] GROUND STATE OF MATTER AT HIGH DENSITIES - EQUATION OF STATE AND STELLAR MODELS [J].

BAYM, G ;

PETHICK, C ;

SUTHERLAND, P .

ASTROPHYSICAL JOURNAL, 1971, 170 (02) :299-+

[9] Sound Velocity Bound and Neutron Stars [J].

Bedaque, Paulo ;

Steiner, Andrew W. .

PHYSICAL REVIEW LETTERS, 2015, 114 (03)

[10] Constraining the onset density of the hadron-quark phase transition with gravitational-wave observations [J].

Blacker, Sebastian ;

Bastian, Niels-Uwe F. ;

Bauswein, Andreas ;

Blaschke, David B. ;

Fischer, Tobias ;

Oertel, Micaela ;

Soultanis, Theodoros ;

Typel, Stefan .

PHYSICAL REVIEW D, 2020, 102 (12)

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