Scalar-isovector δ-meson mean-field and mixed phase structure in compact stars

Author(s)
Grigor Bakhshi Alaverdyan

ABSTRACT

The deconfinement phase transition from ha-dronic matter to quark matter in the interior of compact stars is investigated. The hadronic phase is described in the framework of relativistic mean-field (RMF) theory, when also the scalar-isovector δ-meson effective field is taken into account. The MIT bag model for describing a quark phase is used. The changes of the pa-rameters of phase transition caused by the pre- sence of δ-meson field are investigated. Finally, alterations in the integral and structure para-meters of hybrid stars due to deconfinement phase transitions are discussed.

The deconfinement phase transition from ha-dronic matter to quark matter in the interior of compact stars is investigated. The hadronic phase is described in the framework of relativistic mean-field (RMF) theory, when also the scalar-isovector δ-meson effective field is taken into account. The MIT bag model for describing a quark phase is used. The changes of the pa-rameters of phase transition caused by the pre- sence of δ-meson field are investigated. Finally, alterations in the integral and structure para-meters of hybrid stars due to deconfinement phase transitions are discussed.

KEYWORDS

Neutron Stars; Equation of State; Relativistic Mean-Field; Quarks; Deconfinement Phase Transition

Neutron Stars; Equation of State; Relativistic Mean-Field; Quarks; Deconfinement Phase Transition

Cite this paper

Alaverdyan, G. (2010) Scalar-isovector δ-meson mean-field and mixed phase structure in compact stars.*Natural Science*, **2**, 489-493. doi: 10.4236/ns.2010.25061.

Alaverdyan, G. (2010) Scalar-isovector δ-meson mean-field and mixed phase structure in compact stars.

References

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[2] Liu, B., Greco, V., Baran, V., Colonna, M. and Di Toro, M. (2002) Asymmetric nuclear matter: The role of the isovector scalar channel. Physical Reviews C, 65(4), 335-345.

[3] Greco, V., Colonna, M., Toro, M.D. and Matera, F. (2003) Collective modes of asymmetric nuclear matter in quantum hadrodynamics. Physical Reviews C, 67(1), 015203.

[4] Glendenning, N.K. (1992) First-order phase transitions with more than one conserved charge: Consequences for neutron stars. Physical Reviews D, 46(3), 1274-1287,

[5] Heiselberg, H., Pethick, C.J. and Staubo, E.S. (1993) Quark matter droplets in neutron stars. Physical Review Letters, 70(10), 1355-1359.

[6] Heiselberg, H. and Hjorth-Jensen, M. (2000) Phases of dense matter in neutron stars. Physics Reports, 328(5-6), 237-327.

[7] Alaverdyan, G.B. (2009) Relativistic mean-field theory equation of state of neutron star matter and a Maxwellian phase transition to strange quark matter. Astrophysics, 52(147), 132-150.

[8] Glendenning, N.K. (2000) Compact stars, Springer, Cambridge.

[9] Alaverdyan, G.B. (2009) Scalar-isovector δ meson in the relativistic mean field theory and the structure of neutron stars with a quark core. Gravitation & Cosmology, 15(1), 5-9.

[10] Farhi, E. and Jaffe, R.L. (1984) Strange matter. Physical Reviews D, 30(2), 2379-2390.

[1] Serot, B.D. and Walecka, J.D. (1986) The relativistic nuclear many-body problem. In Adv. in Nuclear Physics, Eds., Negele, J.W and Vogt, E., 16(1), Plenum Press, New York.

[2] Liu, B., Greco, V., Baran, V., Colonna, M. and Di Toro, M. (2002) Asymmetric nuclear matter: The role of the isovector scalar channel. Physical Reviews C, 65(4), 335-345.

[3] Greco, V., Colonna, M., Toro, M.D. and Matera, F. (2003) Collective modes of asymmetric nuclear matter in quantum hadrodynamics. Physical Reviews C, 67(1), 015203.

[4] Glendenning, N.K. (1992) First-order phase transitions with more than one conserved charge: Consequences for neutron stars. Physical Reviews D, 46(3), 1274-1287,

[5] Heiselberg, H., Pethick, C.J. and Staubo, E.S. (1993) Quark matter droplets in neutron stars. Physical Review Letters, 70(10), 1355-1359.

[6] Heiselberg, H. and Hjorth-Jensen, M. (2000) Phases of dense matter in neutron stars. Physics Reports, 328(5-6), 237-327.

[7] Alaverdyan, G.B. (2009) Relativistic mean-field theory equation of state of neutron star matter and a Maxwellian phase transition to strange quark matter. Astrophysics, 52(147), 132-150.

[8] Glendenning, N.K. (2000) Compact stars, Springer, Cambridge.

[9] Alaverdyan, G.B. (2009) Scalar-isovector δ meson in the relativistic mean field theory and the structure of neutron stars with a quark core. Gravitation & Cosmology, 15(1), 5-9.

[10] Farhi, E. and Jaffe, R.L. (1984) Strange matter. Physical Reviews D, 30(2), 2379-2390.