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arXiv 0804.0593nucl-thastro-ph
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超流响应与中子物质的中微子发射

Superfluid Response and the Neutrino Emissivity of Neutron Matter

Andrew W. Steiner, Sanjay Reddy

摘要:

{We计算了中子星内壳超流中子物质的中微子发射率。我们发现在非相对论系统中,由于在有限温度下形成库珀对而产生的涨落所引起的中微子发射被高度抑制。在具有守恒自旋相互作用的中子物质的简化模型中,这种对断裂发射率的抑制对于密度涨落是$v_F^4$的量级,对于自旋涨落是$v_F^2$的量级,其中$v_F$是中子的费米速度。由于单组分系统密度分布的偶极矩不随时间变化,因此密度波动受到较大的抑制。由于这个原因,我们发现,轴向电流响应(自旋波动)占主导地位。在更现实的中子物质模型中,包括张量相互作用,其中中子自旋不守恒,韧致辐射反应产生的中微子辐射发生在$v_F^0$级。因此,即使由于超流性的抑制因素,该速率在$T_C$附近占主导地位。目前的对破缺发射率的计算是不完整的,因为它们忽略了核子-核子相互作用的张量分量。

英文摘要:

{We calculate the neutrino emissivity of superfluid neutron matter in the inner crust of neutron stars. We find that neutrino emission due to fluctuations resulting from the formation of Cooper pairs at finite temperature is highly suppressed in non-relativistic systems. This suppression of the pair breaking emissivity in a simplified model of neutron matter with interactions that conserve spin is of the order of $v_F^4$ for density fluctuations and $v_F^2$ for spin fluctuations, where $v_F$ is the Fermi velocity of neutrons. The larger suppression of density fluctuations arises because the dipole moment of the density distribution of a single component system does not vary in time. For this reason, we find that the axial current response (spin fluctuations) dominates. In more realistic models of neutron matter which include tensor interactions where the neutron spin is not conserved, neutrino radiation from bremsstrahlung reactions occurs at order $v_F^0$. Consequently, even with the suppression factors due to superfluidity, this rate dominates near $T_C$. Present calculations of the pair-breaking emissivity are incomplete because they neglect the tensor component of the nucleon-nucleon interaction.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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