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How large is 'large N _c' for nuclear matter?

机译:核物质的“大N _c”有多大?

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We argue that a so far neglected dimensionless scale, the number of neighbors in a closely packed system, is relevant for the convergence of the large-N _c expansion at high chemical potential. It is only when the number of colors is large w. r. t. this new scale ~O(10) that a convergent large-N _c limit is reached. This provides an explanation as to why the large-N _c expansion, qualitatively successful in vacuum QCD, fails to describe high baryo-chemical potential systems, such as nuclear matter. It also means that phenomenological claims about high-density matter based on large-N _c extrapolations should be treated with caution. This work is based on [1].
机译:我们认为,迄今为止被忽略的无量纲尺度,即紧密堆积的系统中的邻居数,与高化学势下大N _c膨胀的收敛有关。仅当颜色数量大时w。河t。达到收敛的大N _c极限的新标度〜O(10)。这提供了一个解释,为什么在真空QCD中定性成功的大N _c膨胀未能描述高重化学势能系统,例如核物质。这也意味着基于大N_c外推的关于高密度物质的现象学主张应谨慎对待。这项工作基于[1]。

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