非均匀手征相中的夸克β衰变与混合星的冷却
Quark beta decay in an inhomogeneous chiral phase and cooling of hybrid stars
摘要：
我们通过考虑夸克物质的中微子辐射来讨论混合星的冷却。作为一个当前的课题，各种非均匀手性相的出现已经研究了附近的手征转变。在这里，我们考虑由空间调制夸克凝聚指定的双手征密度波（DCDW）。由于DCDW态可以表示为正常夸克物质的手征旋转态，夸克弱流相应地被变换为具有额外的相位因子，从而改变了顶点处的能量动量守恒，使得夸克直接Urca过程成为可能.中微子发射率的直接计算表明，它与夸克或π介子冷却成正比，大小相当。由于DCDW相只在有限密度区域发展，这种新的机制可能会给出一个有趣的关于混合星冷却的场景，即低质量的恒星应该比高质量的恒星更冷。
英文摘要：
We discuss the cooling of hybrid stars by considering the neutrino emission from quark matter. As a current topic the appearance of various inhomogeneous chiral phases have been studied near the chiral transition. Here we consider the dual-chiral-density-wave (DCDW) specified by the spatially modulated quark condensates. Since the DCDW state can be represented as a chirally rotated state from the normal quark matter, the quark weak-current is accordingly transformed to have an additional phase factor which modifies the energy-momentum conservation at the vertex, and makes the quark direct Urca process possible. The direct evaluation of the neutrino emissivity shows that it is proportional to and the magnitude is comparable with the quark or pion cooling. Since the DCDW phase develops only in the limited density region, this novel mechanism may give an interesting scenario about cooling of hybrid stars that lower-mass stars should be cooler than higher-mass ones.
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