Small black holes in string theory are characterized by a classically singular horizon with vanishing Bekenstein-Hawking entropy. It has been argued that higher- curvature corrections resolve the horizon and that the associated Wald entropy is in agreement with the microscopic degeneracy. In this note we study the heterotic two-charge small black hole and question this result, which we claim is caused by a misidentification of the fundamental constituents of the system studied when higher-curvature interactions are present. On the one hand, we show that quadratic curvature corrections do not solve the singular horizon of small black holes. On the other, we argue that the resolution of the heterotic small black hole reported in the literature involves the introduction of solitonic 5-branes, whose asymptotic charge vanishes due to a screening effect induced by the higher- curvature interactions, and a Kaluza-Klein monopole, whose charge remains unscreened.

中文翻译：

---

小黑洞错觉

弦理论中的小黑洞的特点是经典的奇异视界和消失的 Bekenstein-Hawking 熵。有人认为，高曲率校正解决了视界，并且相关的 Wald 熵与微观简并一致。在这篇笔记中，我们研究了异质性双电荷小黑洞并质疑这一结果，我们声称这是由于存在更高曲率相互作用时对所研究系统的基本成分的错误识别造成的。一方面，我们表明二次曲率校正不能解决小黑洞的奇异视界。另一方面，我们认为文献中报道的杂质小黑洞的分辨率涉及引入孤子 5-膜，