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arXiv 1205.6499nucl-thastro-ph.HEhep-ph
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致密中子物质的自旋响应和中微子发射

Spin Response and Neutrino Emissivity of Dense Neutron Matter

G. Shen, S. Gandolfi, S. Reddy, J. Carlson

摘要:

我们研究了零动量转移极限下冷稠密中子物质的自旋响应,发现长波长自旋响应的频率依赖性很好地受到求和规则和高频下两粒子响应的渐近行为的约束.用辅助场扩散蒙特卡罗方法计算了求和规则,并计算了几种核子-核子势的高频两粒子响应。在核饱和密度下,求和规则表明自旋响应强度在$ω\simeq$ 40- 60 MeV处达到峰值,在$ω\geq $ 100 MeV处迅速衰减,在40 MeV以下有相当大的强度。在相对较低的能量下,这种强度可能会导致在与核心坍缩超新星相关的温度下,密集的富中子物质中中微子产生率的提高。

英文摘要:

We study the spin response of cold dense neutron matter in the limit of zero momentum transfer, and show that the frequency dependence of the long-wavelength spin response is well constrained by sum-rules and the asymptotic behavior of the two-particle response at high frequency. The sum-rules are calculated using Auxiliary Field Diffusion Monte Carlo technique and the high frequency two-particle response is calculated for several nucleon-nucleon potentials. At nuclear saturation density, the sum-rules suggest that the strength of the spin response peaks at $ω\simeq$ 40--60 MeV, decays rapidly for $ω\geq $100 MeV, and has a sizable strength below 40 MeV. This strength at relatively low energy may lead to enhanced neutrino production rates in dense neutron-rich matter at temperatures of relevance to core-collapse supernova.

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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