In a holographic model, which was used to investigate the color superconducting phase of QCD, a dilute gas of instantons is introduced to study the nuclear matter. The free energy of the nuclear matter is computed as a function of the baryon chemical potential in the probe approximation. Then the equation of state is obtained at low temperature. Using the equation of state for the nuclear matter, the Tolman-Oppenheimer-Volkov equations for a cold compact star are solved. We find the mass-radius relation of the star, which is similar to the one for the quark star. This similarity implies that the instanton gas given here is a kind of self-bound matter.

中文翻译：

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作为瞬态气体的全息核物质的刚性状态方程

在用于研究 QCD 彩色超导相的全息模型中，引入了一种稀释的瞬子气体来研究核物质。核物质的自由能被计算为探针近似中重子化学势的函数。然后得到低温下的状态方程。使用核物质的状态方程，求解了冷致密星的 Tolman-Oppenheimer-Volkov 方程。我们找到了恒星的质量半径关系，这与夸克星的质量半径关系相似。这种相似性意味着这里给出的瞬子气体是一种自束缚物质。