Science in a very large universe
Abstract
As observers of the universe we are quantum physical systems within it. If the universe is very large in space and/or time, the probability becomes significant that the data on which we base predictions is replicated at other locations in spacetime. The physical conditions at these locations that are not specified by the data may differ. Predictions of our future observations therefore require an assumed probability distribution (the xerographic distribution) for our location among the possible ones. It is the combination of basic theory plus the xerographic distribution that can be predictive and testable by further observations.
 Publication:

Physical Review D
 Pub Date:
 June 2010
 DOI:
 10.1103/PhysRevD.81.123524
 arXiv:
 arXiv:0906.0042
 Bibcode:
 2010PhRvD..81l3524S
 Keywords:

 98.80.Cq;
 Particletheory and fieldtheory models of the early Universe;
 High Energy Physics  Theory;
 General Relativity and Quantum Cosmology
 EPrint:
 14 pages, revised and expanded in v2, correction to App. A (suggested by D. Page) in v3