A true analogy to the Hawking effect must meet an important condition: the virtual phonon pairs must begin life in their ground state, as do the virtual photon pairs around the black hole.

• 真正霍金效应的类比，必须要符合一个重要的条件：虚声子对必须从它们的基态中诞生，就像是黑洞附近的虚光子对一样。