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General Covariance and the Objectivity of Space-time Point-events

Lusanna, Luca and Pauri, Massimo (2005) General Covariance and the Objectivity of Space-time Point-events. [Preprint]

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Abstract

"The last remnant of physical objectivity of space-time" is disclosed, beyond the Leibniz equivalence, in the case of a continuous family of spatially non-compact models of general relativity. The physical individuation of point-events is furnished by the intrinsic degrees of freedom of the gravitational field, (viz, the "Dirac observables") that represent - as it were - the "ontic" part of the metric field. The physical role of the "epistemic" part (viz. the "gauge" variables) is likewise clarified. At the end, a peculiar four-dimensional "holistic and structuralist" view of space-time emerges which includes elements common to the tradition of both substantivalism and relationism. The observables of our models undergo real "temporal change" and thereby provide a counter-example to the thesis of the "frozen-time" picture of evolution.


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Item Type: Preprint
Creators:
CreatorsEmailORCID
Lusanna, Luca
Pauri, Massimo
Keywords: Hole Argument/Space-time Objectivity/Physical Individuation/ Dirac Observables/Gauge Freedom/Temporal Change
Subjects: Specific Sciences > Physics > Relativity Theory
Depositing User: Prof. Massimo Pauri
Date Deposited: 25 Feb 2005
Last Modified: 07 Oct 2010 15:13
Item ID: 2207
URI: http://philsci-archive.pitt.edu/id/eprint/2207

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