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Simultaneity

Edited by Virendra Tripathi (University of Nebraska, Lincoln, University of Nebraska, Omaha)
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  1. Jonathan Bain (2000). The Coordinate-Independent 2-Component Spinor Formalism and the Conventionality of Simultaneity. Studies in History and Philosophy of Science Part B 31 (2):201-226.
    In recent articles, Zangari (1994) and Karakostas (1997) observe that while an &unknown;-extended version of the proper orthochronous Lorentz group O + (1,3) exists for values of &unknown; not equal to zero, no similar &unknown;-extended version of its double covering group SL(2, C) exists (where &unknown;=1-2&unknown; R , with &unknown; R the non-standard simultaneity parameter of Reichenbach). Thus, they maintain, since SL(2, C) is essential in describing the rotational behaviour of half-integer spin fields, and since there is empirical evidence for (...)
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  2. Hanoch Ben-Yami (2015). Causal Order, Temporal Order, and Becoming in Special Relativity. Topoi 34 (1):277-281.
    I reconstruct from Rietdijk and Putnam’s well-known papers an argument against the applicability of the concept of becoming in Special Relativity, which I think is unaffected by some of the objections found in the literature. I then consider a line of thought found in the discussion of the possible conventionality of simultaneity in Special Relativity, beginning with Reichenbach, and apply it to the debate over becoming. We see that it immediately renders Rietdijk and Putnam’s argument unsound. I end by comparing (...)
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  3. Fabien Besnard (2012). Simultaneity in Minkowski Spacetime: From Uniqueness to Arbitrariness. [REVIEW] Foundations of Physics 42 (9):1115-1134.
    Malament (Noûs 11:293–300, 1977) proved a certain uniqueness theorem about standard synchrony, also known as Poincaré-Einstein simultaneity, which has generated many commentaries over the years, some of them contradictory. We think that the situation called for some clarification. After reviewing and discussing some of the literature involved, we prove two results which, hopefully, will help clarifying this debate by filling the gap between the uniquess of Malament’s theorem, which allows the observer to use very few tools, and the complete arbitrariness (...)
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  4. Callender Craig (ed.) (forthcoming). The Oxford Handbook of Time. Oxford University Press.
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  5. Ted Dace, Special Relativity Completed.
    Though Einstein explained time dilation without recourse to a universal frame of reference, he erred by abolishing universal present moments. Relative simultaneity is insufficiently relativistic insofar as it depends on the absolute equality of reference frames in the measurement of the timing of events. Yet any given set of events privileges the frame in which the events take place. Relative to those events, the privileged frame yields the correct measurement of their timing while all other frames yield an incorrect measurement. (...)
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  6. Antony Eagle (2005). A Note on Dolby and Gull on Radar Time and the Twin 'Paradox'. American Journal of Physics 73:976–979.
    Recently a suggestion has been made that standard textbook representations of hypersurfaces of simultaneity for the travelling twin in the twin 'paradox' are incorrect. This suggestion is false: the standard textbooks are in agreement with a proper understanding of the relativity of simultaneity.
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  7. Brian Ellis (1971). On Conventionality and Simultaneity - a Reply. Australasian Journal of Philosophy 49 (2):177 – 203.
    This paper is a response to the "panel discussion of simultaneity by slow clock transport in the special and general theories of relativity" ("philosophy of science", 36, (march, 1969), Pp. 1-81) which arose out of a paper by brian ellis and peter bowman on "conventionality in distant simultaneity", ("philosophy of science", 34, (june, 1967), Pp. 116-36). It is argued that the basic disagreement between the pittsburgh panel and us is an epistemological one. In particular, Our concept of a good physical (...)
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  8. Eugene Feenberg (1974). Conventionality in Distant Simultaneity. Foundations of Physics 4 (1):121-126.
    Thought experiments are described in which the one-way velocity of light appears as a physical quantity. A rotating shaft is used to define distant synchrony for a system of clocks along the shaft. In this context Einstein's definition of distant simultaneity is seen as based on a physical assumption (and not merely on an overwhelmingly sensible choice in a range of conventional possibilities).
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  9. Luke Fenton-Glynn & Thomas Kroedel (2015). Relativity, Quantum Entanglement, Counterfactuals, and Causation. British Journal for the Philosophy of Science 66 (1):45-67.
    We investigate whether standard counterfactual analyses of causation (CACs) imply that the outcomes of space-like separated measurements on entangled particles are causally related. Although it has sometimes been claimed that standard CACs imply such a causal relation, we argue that a careful examination of David Lewis’s influential counterfactual semantics casts doubt on this. We discuss ways in which Lewis’s semantics and standard CACs might be extended to the case of space-like correlations.
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  10. Amit Hagar (2013). Review of Tim Maudlin's Philosophy of Physics: Space & Time. [REVIEW] Physics in Perspective (x).
  11. Andrew Holster, Extrinsic Versus Intrinsic Curvature: Parable of the Ants.
    The theory of the ‘realist ants’ sketched in this parable refers to a real unified theory proposed in “A Geometric Model of the Universe”, http://philpapers.org/rec/HOLAGM. The parable is about the initial metaphysical controversy faced in trying to introduce such a theory. The conventional positivist philosophy of ‘space-time physics’ holds that an intrinsically curved space-time manifold, governed by GTR and represented by a tensor calculus, is the only scientifically legitimate possibility in light of ‘the known facts of modern physics’, while the (...)
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  12. Robert D. Klauber (2007). Relativistic Rotation: A Comparison of Theories. [REVIEW] Foundations of Physics 37 (2):198-252.
    Alternative theories of relativistic rotation considered viable as of 2004 are compared in the light of experiments reported in 2005. En route, the contentious issue of simultaneity choice in rotation is resolved by showing that only one simultaneity choice, the one possessing continuous time, gives rise, via the general relativistic equation of motion, to the correct Newtonian limit Coriolis acceleration. In addition, the widely dispersed argument purporting Lorentz contraction in rotation and the concomitant curved surface of a rotating disk is (...)
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  13. Marco Mamone-Capria (2012). Simultaneity as an Invariant Equivalence Relation. Foundations of Physics 42 (11):1365-1383.
    This paper deals with the concept of simultaneity in classical and relativistic physics as construed in terms of group-invariant equivalence relations. A full examination of Newton, Galilei and Poincaré invariant equivalence relations in ℝ4 is presented, which provides alternative proofs, additions and occasionally corrections of results in the literature, including Malament’s theorem and some of its variants. It is argued that the interpretation of simultaneity as an invariant equivalence relation, although interesting for its own sake, does not cut in the (...)
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  14. Jill North (2008). Book Review. Concepts of Simultaneity: From Antiquity to Einstein and Beyond. Max Jammer. [REVIEW] American Scienctist 98 (1).
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  15. Wesley C. Salmon (1969). The Conventionality of Simultaneity. Philosophy of Science 36 (1):44-63.
    After describing a new method of synchronizing spatially separated clocks by means of clock transport, this paper discusses the philosophical import of the existence of such methods, including those of Ellis and Bowman and of Bridgman, with special reference to the Ellis-Bowman claim that "the thesis of the coventionality of distant simultaneity... is thus either trivialized or refuted." I argue that the physical facts do not support this philosophical conclusion, and that a substantial part of their argument against Reichenbach, in (...)
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  16. Steven Savitt & Roberto Torretti (2011). Time in the Special Theory of Relativity. In Craig Callender (ed.), The Oxford Handbook of Philosophy of Time. Oxford University Press 546--570.
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  17. Andrew Wutke, A Study on Invariance of Temporal Coincidence.
    This paper presents an attempt to define temporal coincidence starting from the first principles. The temporal coincidence defined here differs from Einstein’s simultaneity for it is invariant across inertial frames - not relative. The meaning and significance of temporal coincidence is derived from axioms of existence and it somehow relates to Kant’s notion of simultaneity. Consistentl y applied to the Special Theory of Relativity framework, temporal coincidence does not in any way create mathematical contradictions; however it allows looking at some (...)
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  18. Andrew Wutke, The Apparent Nature of Relative Simultaneity.
    This paper presents the proof of the apparent nature of relative simultaneity originally derived from Einstein’s Special Theory of Relativity (STR). The proof does not challenge the validity of the STR but uncovers fundamental and widespread error in understanding of practical implications of Lorentz transformations. It is demonstrated that more than a century long debates generally miss the point. This results in counterintuitive claims of coexisting multiple time realities by mere equivalence of equal clock indications and simultaneity. Such claims have (...)
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  19. Peter Øhrstrøm (1980). Conventionality in Distant Simultaneity. Foundations of Physics 10 (3-4):333-343.
    The paper defends the thesis of conventionality in distant simultaneity within the special theory of relativity. The thesis can be expressed in the following way: There is no method independent of standard synchronization by which the one-way velocity of light can be measured if all empirical consequences of the special theory of relativity are to be accepted. Three methods which have recently been suggested are investigated. It is shown that they all depend on the method of standard synchronization. It is (...)
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