I have pasted below the abstract of a draft philosophy paper I have just completed, which may be of interest. The paper is at http://www.physica.freeserve.co.uk/pa01.htm
Comments/corrections welcome. Alastair Plausibility of the Existence of all Possible States The argument for the existence of all possible worlds has in the past been deemed problematical due to the failure of induction it implies. In this paper I argue that by focussing on an approach that distinguishes a hidden reality from the world of appearance, and on a corresponding generalisation from 'all possible worlds' to 'all possible states', this problem is readily surmountable. Moreover the positive success of inductive reasoning and the lack of observed paranormal events emerge as a natural consequence.
