Influences Of Gravity Correction And Relativistic Effects Of Neutrino Emission On The Cooling Properties Of Neutron Stars

Because of the super density structure and the storage of data base,neutron stars have been become the best laboratory to research the extreme reaction and the characters of compact matter.And they have been paid most attention by scientists all over the world.The theoretical study on the properties of neutron stars is beneficial to the improvement of the theory of high density materials and even the discovery of new micro particles.Therefore,it is a research hotspot of nuclear astrophysics and particle physics.This article majors in researching the influence of the gravity correction and relativistic effect of neutrino emission on neutron stars.At first,the characters of neutron star matter are described by the relativistic mean field theory(RMFT).Then the state equations are acquired by solving energy-momentum formulas in the mean field approximate.Next the state equations are regarded as input quantity of TOV equations in order to describe the structure of neutron stars.Through the above calculations,many physical quantities will be obtained such as mass,radius of neutron stars.Finally,the cooling characters of neutron stars are studied by the weak interaction cooling theory.This article is divided into five chapters.The varieties and structures of neutron stars as well as the theories used in this article are overviewed in the first two chapters.In the third chapter,the relativistic effects of neutrino emissivity on the cooling properties of neutron stars are compared.Results show that relativistic effect makes the neutrino emissivity,neutrino luminosity and cooling rate lower.In the fourth chapter,the hyperons are induced in RMFT and compare the distinctions between traditional neutron stars and hyperon stars in aspects of neutrino emissivity and cooling speed.The results show that the appearance of hyperons reduces the cooling speed of neutron stars.And relativistic neutrino emissivity makes the restrained effect on the cooling speed of traditional stars and hyperon stars.In the fifth chapter,the structure,neutrino emissivity and the cooling curvesof traditional neutron stars and hyperon stars are calculated,the results show that gravity correction effect enhances the cooling speed of neutron stars and strengthens relativistic neutrino emissivity effect.