For those interested in the anthropomorphic principle, this paper by Wald might be interesting:
<a href="http:&#x2F;&#x2F;arxiv.org&#x2F;pdf&#x2F;gr-qc&#x2F;0507094v1.pdf" rel="nofollow">http:&#x2F;&#x2F;arxiv.org&#x2F;pdf&#x2F;gr-qc&#x2F;0507094v1.pdf</a>