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Bayesian inference of signatures of hyperons inside neutron stars
Physical Review D ( IF 5 ) Pub Date : 2022-09-29 , DOI: 10.1103/physrevd.106.063024
Tuhin Malik, Constança Providência

The possible signatures of the presence of hyperons inside neutron stars are discussed within a Bayesian inference framework applied to a set of models based on a density dependent relativistic mean field description of hadronic matter. Nuclear matter properties, hypernuclei properties and observational information are used to constraint the models. General properties of neutron stars such as the maximum mass, radius, tidal deformability, proton fraction, hyperon fraction and speed of sound are discussed. It is shown that the two solar mass constraint imposes that neutron stars described by equations of state that include hyperons have in average a larger radius, 0.5km, and a larger tidal deformability, 150, than the stars determined from a nucleonic equation of state, while the speed of sound at the center of the star is more than 25% smaller. If a 1.4M star with a radius 12.5km is measured it is quite improbable that a massive star described by the same model contains hyperons. A similar conclusion is drawn if a two solar mass star with a radius 11.5km or a neutron star with a mass above 2.2M is observed: the possible hyperon content of these stars is ruled out or very reduced. The hyperon presence inside neutron stars is compatible with the present NICER mass-radius observations of the pulsars PSR J0030+0451 and PSR J0740+6620 and the gravitational wave detection GW170817. It is shown that if the polytropic index γ=lnp/lnε takes values of the order of 1.75 at not too large densities, it may indicate the onset of some kind of exotic matter, but not necessarily of deconfined quark matter.

中文翻译:

中子星内部超子特征的贝叶斯推断

在贝叶斯推理框架内讨论了中子星内部存在超子的可能特征,该框架应用于基于强子物质的密度相关相对论平均场描述的一组模型。核物质特性、超核特性和观测信息用于约束模型。讨论了中子星的一般性质,例如最大质量、半径、潮汐变形性、质子分数、超子分数和声速。结果表明,两个太阳质量约束强加了由包含超子的状态方程描述的中子星平均具有更大的半径,0.5公里,以及更大的潮汐变形性,150,比由核子状态方程确定的恒星,而恒星中心的声速要小 25% 以上。如果一个1.4有半径的星星12.5公里经测量,同一模型描述的大质量恒星不太可能包含超子。如果两个太阳质量的恒星半径为11.5公里或质量高于2.2观察到:这些恒星可能的超子含量被排除或非常减少。中子星内部的超子存在与目前对脉冲星 PSR 的 NICER 质量半径观测结果一致Ĵ0030+0451和 PSRĴ0740+6620和引力波探测GW170817。结果表明,如果多方指数γ=lnp/lnε在不太大的密度下取 1.75 数量级的值,它可能表明某种奇异物质的开始,但不一定是解禁的夸克物质。
更新日期:2022-09-29
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