In this essay, it is proved that there are black holes that are dangerously cold. In particular, by analyzing the emission spectra of highly charged black holes we reveal the fact that near-extremal black holes whose Bekenstein–Hawking temperatures lie in the regime $T_{\text{BH}}\lesssim m_e^6/e^3$ may turn into horizonless naked singularities, thus violating the cosmic censorship principle, if they emit a photon with the characteristic thermal energy $\omega =O(T_{\text{BH}})$ (here $\{m_e,e\}$ are, respectively, the proper mass and the electric charge of the electron, the lightest charged particle). We therefore raise here the conjecture that, in the yet unknown quantum theory of gravity, the temperatures of well-behaved black-hole spacetimes are fundamentally bounded from below by the relation $T_{\text{BH}}\gtrsim m_e^6/e^3$.

在这篇文章中，证明了存在危险的低温黑洞。特别是，通过分析高电荷黑洞的发射光谱，我们揭示了这样一个事实：贝肯斯坦-霍金温度处于近极值黑洞的范围内${\mathrm{时间}}_{\text{乙肝}}\lesssim {米}_e^6/e^3$如果它们发射具有特征热能的光子，则可能会变成无地平线的裸奇点，从而违反宇宙审查原则$\omega =氧（{\mathrm{时间}}_{\text{乙肝}}）$（这里$\{{米}_e,e\}$分别是电子（最轻的带电粒子）的固有质量和电荷）。因此，我们在这里提出这样的猜想：在尚不可知的量子引力理论中，行为良好的黑洞时空的温度从根本上受到以下关系的限制：${\mathrm{时间}}_{\text{乙肝}}\gtrsim {米}_e^6/e^3$。