What's the trouble with anthropic reasoning?

Details What's the trouble with anthropic reasoning? What's the trouble with anthropic reasoning?

2006-10-11

arxiv.org/abs/astro-ph/0610330v1

AIP Conference Proceedings, Vol 878, 323-329. 2nd International Conference on The Dark Side of the Universe DSU 2006, Madrid (

Astronomy and Astrophysics

Astrophysics

8 pages, no figures. Contribution to the proceedings of the conference "The Dark Side of the Universe", Madrid, June 2006

Scientific paper

10.1063/1.2409104

Selection effects in cosmology are often invoked to "explain" why some of the fundamental constant of Nature, and in particular the cosmological constant, take on the value they do in our Universe. We briefly review this probabilistic "anthropic reasoning" and we argue that different (equally plausible) ways of assigning probabilities to candidate universes lead to totally different anthropic predictions, presenting an explicit example based on the total number of possible observations observers can carry out. We conclude that in absence of a fundamental motivation for selecting one weighting scheme over another the anthropic principle cannot be used to explain the value of Lambda. .

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