论文标题

手性核力量对中微子平均自由路径在热中子物质中的影响

Effect of chiral nuclear forces on the neutrino mean free path in hot neutron matter

论文作者

Vidana, Isaac, Logoteta, Domenico, Bombaci, Ignazio

论文摘要

我们研究了手性核力量对中微子在热中子物质中传播的作用。特别是,我们分析了动态结构因子和中微子平均自由路径的收敛性,并分析了手性力计数的顺序,以及这些力在确定这些数量的调节器临界值的作用。计算动态结构因子所需的单粒子能量和化学电位是在Brueckner-Hartree-Fock近似中获得的,扩展到有限温度。 Our results show that the dynamical structure factor and the neutrino mean free path depend on the cut-off only when the chiral potential is considered at leading order (LO) and next-to leading order (NLO), becoming this dependence strongly reduced at higher orders in the chiral power counting due to the role of three-nucleon forces that start to contribute at next-to-next-to leading order (N$^2$LO) being, in particular, almost negligible at临时到接头订单(n $^3 $ lo)。当增加手性能力计数的顺序时,发现中微子平均自由路径的收敛性达到略低于$ \ sim 0.15 $ fm $^{ - 3} $,尽管没有发现高于此值的密度的信号。与我们的逐订单核核多体性计算相关的中微子平均值自由路径相关的不确定性大致估计是从n $^2 $ lo和n $^3 $ lo中获得的结果之间的差异,发现它的不确定性是从低密度的大约几厘米,低于$ 2 $米的$ 2 $米的$ 0.3 $ 0.3 $^$^fm^$^fm^$^3.3 c^3.3.3.33.3.3.3 $ fm^$^3.3 c。

We study the role of chiral nuclear forces on the propagation of neutrinos in hot neutron matter. In particular, we analyze the convergence of the dynamical structure factor and the neutrino mean free path with the order of the power counting of the chiral forces, as well as the role of the regulator cut-off of these forces in the determination of these quantities. Single-particle energies and chemical potentials needed to calculate the dynamical structure factor are obtained within the Brueckner--Hartree--Fock approximation extended to finite temperature. Our results show that the dynamical structure factor and the neutrino mean free path depend on the cut-off only when the chiral potential is considered at leading order (LO) and next-to leading order (NLO), becoming this dependence strongly reduced at higher orders in the chiral power counting due to the role of three-nucleon forces that start to contribute at next-to-next-to leading order (N$^2$LO) being, in particular, almost negligible at next-to-next-to-next-to leading order (N$^3$LO). The neutrino mean free path is found to converge up to densities slightly below $\sim 0.15$ fm$^{-3}$ when increasing the order of the chiral power counting, although no signal of convergence is found for densities above this value. The uncertainty associated with our order-by-order nuclear many-body calculation of the neutrino mean free path is roughly estimated from the difference between the results obtained at N$^2$LO and N$^3$LO, finding that it varies from about a few centimeters at low densities up to a bit less than $2$ meters at the largest one considered in this work, $0.3$ fm$^{-3}$.

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