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arXiv 1905.13634astro-ph.HEhep-phnucl-th
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超新星物质中中微子核子-核子韧致辐射的手征有效场论描述

Chiral effective field theory description of neutrino nucleon-nucleon Bremsstrahlung in supernova matter

Gang Guo, Gabriel Martínez-Pinedo

摘要:

本文利用长波长极限下的$T$ -矩阵形式,重新讨论了超新星物质中核子-核子韧致辐射的中微子对发射率和吸收率。基于手征有效场论的两体势($χ$ EFT),求解了包含非对角贡献的$T$ -矩阵的Lippmann-Schwinger方程.我们考虑末态泡利阻塞,因此我们的计算对任意简并度的核子都是有效的。我们还探讨了介质中的$T$矩阵的影响,并发现他们是相对较小的超新星物质。我们比较我们的结果与一π交换率,通常用于超新星模拟,并使用一个有效的壳对角$T$ -矩阵从测量的相移计算。我们估计,由于随机相位近似的多重散射效应和相关性引入小的校正上的$T$矩阵结果在欠饱和密度。提供了结构函数的数值表,可用于超新星模拟。

英文摘要:

We revisit the rates of neutrino pair emission and absorption from nucleon-nucleon bremsstrahlung in supernova matter using the $T$-matrix formalism in the long-wavelength limit. Based on two-body potentials of chiral effective field theory ($χ$EFT), we solve the Lippmann-Schwinger equation for the $T$-matrix including non-diagonal contributions. We consider final-state Pauli blocking and hence our calculations are valid for nucleons with an arbitrary degree of degeneracy. We also explore the in-medium effects on the $T$-matrix and find that they are relatively small for supernova matter. We compare our results with one-pion exchange rates, commonly used in supernova simulations, and calculations using an effective on-shell diagonal $T$-matrix from measured phase shifts. We estimate that multiple-scattering effects and correlations due to the random phase approximation introduce small corrections on top of the $T$-matrix results at subsaturation densities. A numerical table of the structure function is provided that can be used in supernova simulations.

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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