Chiral condensates in quark and nuclear matter

Chiral condensates in quark and nuclear matter
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夸克和核物质中的手性凝聚

DOI:
10.1142/s0217751x03014046
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发表时间:
2003-04
期刊:
Inter. J. Mod. Phys.
影响因子:
--
通讯作者:
姜焕清
姜焕清
中科院分区:
其他
文献类型:
--
作者:
彭光雄;姜焕清

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我们提出了一种计算介质内夸克凝聚的新方法。这种方法的优点是不需要对模型参数相对于夸克当前质量的导数做出进一步的假设。核物质中通常接受的与模型无关的结果是自然再现的。相互作用引起的夸克凝聚体的变化取决于核物质的不可压缩性。当它大于265 MeV时,凝聚态消失的密度高于线性外推的密度。对于夸克物质中的手性凝聚体,在较低密度下也发现了类似的与模型无关的线性行为,这意味着如果π介子-核子西格玛换向器是a和d夸克平均当前质量的六倍,则夸克物质中凝聚体的减小速度仅为核物质中的一半。与线性外推法相比,类 QCD 相互作用引起的修改被发现可以减缓凝聚体的下降速度。
We present a novel treatment of calculating the in-medium quark condensates. The advantage of this approach is that one does not need to make further assumptions on the derivatives of model parameters with respect to the quark current mass. The normally accepted model-independent result in nuclear matter is naturally reproduced. The change of the quark-condensate induced by interactions depends on the incompressibility of nuclear matter. When it is greater than 265 MeV, the density at which the condensate vanishes is higher than that from the linear extrapolation. For the chiral condensate in quark matter, a similar model-independent linear behavior is found at lower densities, which means that the decreasing speed of the condensate in quark matter is merely half of that in nuclear matter if the pion-nucleon sigma commutator is six times the average current mass of a and d quarks. The modification due to QCD-like interactions is found to slow the decreasing speed of the condensate, compared with the linear extrapolation.
DOI: 10.1103/physrevd.33.3349
发表时间: 1986-06
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影响因子: --
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