This work aims to analyze how hyperons affect neutrino radiation properties in nucleonic direct URCA processes,with the goal of providing useful references for identifying evidence of hyperons in astronomical observat...This work aims to analyze how hyperons affect neutrino radiation properties in nucleonic direct URCA processes,with the goal of providing useful references for identifying evidence of hyperons in astronomical observations.This analysis is conducted using the GM1 and NL3 parameter sets under the SU(6)and SU(3)flavor symmetries within the relativistic mean field theory framework.In conjunction with the inferred mass and radius values of PSRs J1231-1411,J0030+0451,and J0740+6620,our results indicate that nucleonic direct URCA processes are absent in PSR J1231-1411 due to momentum conservation violation.In the hyperon-containing PSR J0030+0451(NL3 parameter set),the nucleonic direct URCA processes involving e^(-)/μ^(-)would occur.A large inferred mass span induces hyperon fraction variations,which affect neutrino emissivity.If the inferred mass of PSR J0030+0451 exceeds approximately 1.8M_(⊙),the neutrino luminosity of the nucleonic direct URCA processes under the SU(3)flavor symmetry remains nearly the same as that in npeμmatter,independent of hyperons.However,it shows an obvious hyperon dependence under the SU(6)spin-flavor symmetry.For hyperon-containing J0740+6620,the nucleonic direct URCA processes under the SU(3)flavor symmetry in the GM1 parameter set predict a faster decline in neutrino luminosity with the hyperonic fraction than in npeμmatter,and under the SU(6)spin-flavor symmetry in the NL3 parameter set,it shows a monotonic decreasing trend.The research indicates that the hyperonic fraction significantly affects the neutrino radiation properties of nucleonic direct URCA processes in neutron stars.Different-mass pulsars(e.g.,PSRs J1231-1411,J0030+0451,J0740+6620)exhibit distinct behaviors of nucleonic direct URCA processes,depending on inferred masses/radii,parameter sets,and theoretical models.展开更多
基金Supported by the Development Project of Science and Technology of Jilin Province(20250102012JC)the Special Project for the Theoretical Basic Research of Changchun Satellite Observatory,National Astronomical Observatories,Chinese Academy of Sciences(Y990000205)。
文摘This work aims to analyze how hyperons affect neutrino radiation properties in nucleonic direct URCA processes,with the goal of providing useful references for identifying evidence of hyperons in astronomical observations.This analysis is conducted using the GM1 and NL3 parameter sets under the SU(6)and SU(3)flavor symmetries within the relativistic mean field theory framework.In conjunction with the inferred mass and radius values of PSRs J1231-1411,J0030+0451,and J0740+6620,our results indicate that nucleonic direct URCA processes are absent in PSR J1231-1411 due to momentum conservation violation.In the hyperon-containing PSR J0030+0451(NL3 parameter set),the nucleonic direct URCA processes involving e^(-)/μ^(-)would occur.A large inferred mass span induces hyperon fraction variations,which affect neutrino emissivity.If the inferred mass of PSR J0030+0451 exceeds approximately 1.8M_(⊙),the neutrino luminosity of the nucleonic direct URCA processes under the SU(3)flavor symmetry remains nearly the same as that in npeμmatter,independent of hyperons.However,it shows an obvious hyperon dependence under the SU(6)spin-flavor symmetry.For hyperon-containing J0740+6620,the nucleonic direct URCA processes under the SU(3)flavor symmetry in the GM1 parameter set predict a faster decline in neutrino luminosity with the hyperonic fraction than in npeμmatter,and under the SU(6)spin-flavor symmetry in the NL3 parameter set,it shows a monotonic decreasing trend.The research indicates that the hyperonic fraction significantly affects the neutrino radiation properties of nucleonic direct URCA processes in neutron stars.Different-mass pulsars(e.g.,PSRs J1231-1411,J0030+0451,J0740+6620)exhibit distinct behaviors of nucleonic direct URCA processes,depending on inferred masses/radii,parameter sets,and theoretical models.
