Pitts, J. Brian (2006) The Anderson-Friedman Absolute Objects Program: Several Successes, One Difficulty. In:  Philosophy of Science Assoc. 20th Biennial Mtg (Vancouver) > PSA 2006 Contributed Papers.
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The Anderson-Friedman absolute objects project is reviewed. The Jones-Geroch dust 4-velocity counterexample is resolved by eliminating irrelevant structure. Torretti's example involving constant curvature spaces is shown to have an absolute object on Anderson's analysis. The previously neglected threat of an absolute object from an orthonormal tetrad used for coupling spinors to gravity appears resolvable by eliminating irrelevant fields and using a modified spinor formalism. However, given Anderson's definition, GTR itself has an absolute object (as Robert Geroch has observed recently): a change of variables to a conformal metric density and a scalar density shows that the latter is absolute.
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|Item Type:||Conference or Workshop Item (UNSPECIFIED)|
|Keywords:||general covariance, absolute object, spinor, density|
|Subjects:||Specific Sciences > Physics > Symmetries/Invariances|
Specific Sciences > Physics > Relativity Theory
Specific Sciences > Physics > Quantum Field Theory
|Conferences and Volumes:|| Philosophy of Science Assoc. 20th Biennial Mtg (Vancouver) > PSA 2006 Contributed Papers|
|Depositing User:||Dr. Dr. J. Brian Pitts|
|Date Deposited:||21 Oct 2006|
|Last Modified:||07 Oct 2010 11:14|
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