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Reflections on Spacetime - Foundations, Philosophy, History (Hardcover, Reprinted from ERKENNTNIS 42:2, 1995)
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Reflections on Spacetime - Foundations, Philosophy, History (Hardcover, Reprinted from ERKENNTNIS 42:2, 1995)
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REFLECTIONS ON SPACETIME - FOUNDATIONS, PHILOSOPHY AND HISTORY
During the academic year 1992/93, an interdisciplinary research
group constituted itself at the Zentrum fUr interdisziplinare
Forschung (ZiF) in Bielefeld, Germany, under the title 'Semantical
Aspects of Spacetime Theories', in which philosophers and
physicists worked on topics in the interpretation and history of
relativity theory. The present issue consists of contributions
resulting from material presented and discussed in the group during
the course of that year. The scope of the papers ranges from rather
specialised issues arising from general relativity such as the
problem of referential indeterminacy, to foundational questions
regarding spacetime in the work of Carnap, Weyl and Hilbert. It is
well known that the General Theory of Relativity (GTR) admits
spacetime models which are 'exotic' in the sense that observers
could travel into their own past. This poses a number of problems
for the physical interpretation of GTR which are also relevant in
the philosophy of spacetime. It is not enough to exclude these
exotic models simply by stating that we live in a non-exotic
universe, because it might be possible to "operate time machines"
by actively changing the topology of the future part of spacetime.
In his contribution, Earman first reviews the attempts of
physicists to prove "chronology protection theorems" (CPTs) which
exclude the operation of time machines under reasonable
assumptions.
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