 Supposing that we grant a successful resolution of all these challenges, the merits of a multiverse solution of fine-tuning problems could then be evaluated by comparison with competing ideas. The most widely cited evidence in favor of a multiverse is Weinberg’s prediction for the value of \(\Lambda\), discussed above. There are other proposals to explain the observed value of \(\Lambda\); Wang, Zhu, and Unruh (2017), for example, treat the quantum vacuum as extremely inhomogeneous, and argue that resonance among the vacuum fluctuations leads to a small \(\Lambda\).