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A Puzzle about Laws, Symmetries and Measurability

Roberts, John (2008) A Puzzle about Laws, Symmetries and Measurability. [Preprint]

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    Abstract

    I describe a problem about the relations among symmetries, laws, and measurable quantities. I explain why several ways of trying to solve it will not work, and I sketch a solution that might work. I discuss this problem in the context of Newtonian theories, but it also arises for many other physical theories. The problem is that there are two ways of defining the space-time symmetries of a physical theory: as its dynamical symmetries, or as its empirical symmetries. The two definitions are not equivalent, yet they pick out the same extension. This coincidence cries out for explanation, and it is not clear what the explanation could be.


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    Item Type: Preprint
    Additional Information: This paper is forthcoming in British Journal for the Philosophy of Science.
    Keywords: Laws, Laws of Nature, Symmetries, Measurement
    Subjects: General Issues > Laws of Nature
    Specific Sciences > Physics > Symmetries/Invariances
    Depositing User: John T. Roberts
    Date Deposited: 06 Mar 2008
    Last Modified: 07 Oct 2010 11:16
    Item ID: 3920
    URI: http://philsci-archive.pitt.edu/id/eprint/3920

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