Cooling of neutron stars and emissivity of neutrinos by the direct Urca process under influence of a strong magnetic field

8th International Workshop on Hadron Physics

Coelho, E.L.^1,2 ; Chiapparini, M.^1 ; Negreiros, R.P.^3

Instituto de Física, Universidade Do Estado Do Rio de Janeiro, Rio de Janeiro

20559-900, Brazil^1

Universidade Veiga de Almeida, Rio de Janeiro

20271-020, Brazil^2

Instituto de Física, Universidade Federal Fluminense, Rio de Janeiro

24210-346, Brazil^3

关键词: Direct Urca process;    High temperature;    Loss of energy;    Nuclear matters;    Numerical calculation;    Relativistic mean fields;    Strong magnetic fields;    Zero temperatures;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/706/5/052011/pdf
DOI  :  10.1088/1742-6596/706/5/052011

来源: IOP

【 摘 要 】

Neutron stars are born with high temperatures and during a few seconds suffer rapid cooling by emission of neutrinos. The direct Urca process is the main mechanism to explain this loss of energy. In this work we study the influence of a strong magnetic field on the composition of nuclear matter at high densities and zero temperature. We describe the matter through a relativistic mean-field model with eight light baryons (baryon octet), electrons, muons magnetic field. As output of the numerical calculations, we obtain the relative population for a parametrized magnetic field. We calculate the cooling of neutron stars with different mass and magnetic fields due to direct Urca process.