We investigate the explicit role of negative local non-Gaussianity, fNL, in suppressing the abundance of primordial black holes (PBHs) in the single-field model of Galileon inflation. PBH formation requires significantly enhancing the scalar power spectrum, which greatly affects their abundance. The associated frequencies in the nHz regime are also sensitive to the generation of scalar-induced gravitational waves (SIGWs) which may explain the current data from the pulsar timing arrays (PTAs). Our analysis using the threshold statistics on the compaction function demonstrates that Galileon theory not only avoids PBH overproduction using the curvature perturbation enhancements that give fNL∼O(−6), but also generates SIGWs that conform well with the PTA data.

中文翻译：

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原初非高斯性是伽利略暴胀脉冲星定时阵列产生的 SIGW 中 PBH 过剩的救世主


我们研究了负局部非高斯性 fNL 在抑制伽利略膨胀单场模型中原初黑洞 (PBH) 丰度方面的显着作用。 PBH 的形成需要显着增强标量功率谱，这极大地影响了它们的丰度。 nHz 范围内的相关频率对标量诱发引力波 (SIGW) 的生成也很敏感，这可以解释脉冲星计时阵列 (PTA) 的当前数据。我们使用压实函数的阈值统计数据进行的分析表明，伽利略理论不仅使用给出 fNL∼O(−6) 的曲率扰动增强来避免 PBH 过度生产，而且还生成与 PTA 数据非常一致的 SIGW。