Simultaneity

Edited by Virendra Tripathi (University of Nebraska, Lincoln, University of Nebraska, Omaha)
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  1. added 2019-02-16
    More on McTaggart's AB-Series in Physics.Paul Merriam - manuscript
  2. added 2019-02-14
    Towards an AB-Series Interpretation of Time in Physics.Paul Merriam - manuscript
    How can McTaggart's A-series notion of time be incorporated into physics while retaining the B-series notion? It may be the A-series 'now' can be construed as ontologically private. How is that modeled? Could a definition of a combined AB-series entropy help with the Past Hypothesis problem? What if the increase in entropy as a system goes from earlier times to later times is canceled by the decrease in entropy as a system goes from future, to present, to past?
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  3. added 2019-01-18
    The Ineffable Now in Physics.Paul Merriam - manuscript
    While physicists know how to use quantum mechanics, there is no consensus on what quantum mechanics is a mechanics of. The aim of this paper is to introduce the beginning of what might turn out to be an interpretation of quantum mechanics—one that leaves all calculated probabilities intact. The basic idea is that quantum mechanics describes the objective world, but there must be added to it ineffable variables, one of which is the temporal 'now'. Ineffable variables are not 'hidden variables'.
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  4. added 2018-12-31
    The Arrow of Time.Ted Dace - 2018 - Cosmos and History 14 (3):321-333.
    The foundation of irreversible, probabilistic time -- the classical time of conscious observation -- is the reversible and deterministic time of the quantum wave function. The tendency in physics is to regard time in the abstract, a mere parameter devoid of inherent direction, implying that a concept of real time begins with irreversibility. In reality time has no need for irreversibility, and every invocation of time implies becoming or flow. Neither symmetry under time reversal, of which Newton was well aware, (...)
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  5. added 2018-10-27
    Absolute Distant Simultaneity in Special Relativity.Hanoch Ben-Yami - manuscript
    What is simultaneous with an event is what can interact with it; events have duration; therefore, any given event has distant events simultaneous with it, even according to Special Relativity. Consequently, the extension of our pre-relativistic judgments of distant simultaneity are largely preserved.
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  6. added 2018-10-27
    Apparent Simultaneity.Hanoch Ben-Yami - unknown
    I develop Special Relativity with backward-light-cone simultaneity, which I call, for reasons made clear in the paper, ‘Apparent Simultaneity’. In the first section I show some advantages of this approach. I then develop the kinematics in the second section. In the third section I apply the approach to the Twins Paradox: I show how it removes the paradox, and I explain why the paradox was a result of an artificial symmetry introduced to the description of the process by Einstein’s simultaneity (...)
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  7. added 2018-09-16
    Lebensweltliche Und Physikalische Zeit.Gregor Schiemann - 2015 - In G. Hartung (ed.), Mensch und Zeit. Springer. pp. 207-225.
    Zur Aufklärung der vielschichtigen Beziehungen zwischen Lebenswelt und Physik diskutiere ich die für die beiden Erfahrungsweisen jeweils typischen Konzeptualisierungen von Zeit. Nach einer Einleitung beginne ich mit der Analyse der subjektiven und objektiven lebensweltlichen Zeitformen. Anschließend erörtere ich im dritten Abschnitt das Verhältnis von lebensweltlichen und physikalischen Elementen der Weltzeit. Vier physikalische Zeitverständnisse stelle ich in ihrer Differenz zur lebensweltlichen Auffassung im vierten Abschnitt dar. Historisch hat sich die generelle Tendenz zur Vergrößerung dieser Differenz fortgesetzt, ohne dass schon Instanzen zur (...)
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  8. added 2018-09-10
    Figures of Light in the Early History of Relativity (1905-1914).Scott A. Walter - forthcoming - In David Rowe, Tilman Sauer & Scott A. Walter (eds.), Einstein Studies. New York, USA: Birkhäuser. pp. 3-50.
    Albert Einstein's bold assertion of the form-invariance of the equation of a spherical light wave with respect to inertial frames of reference became, in the space of six years, the preferred foundation of his theory of relativity. Early on, however, Einstein's universal light-sphere invariance was challenged on epistemological grounds by Henri Poincaré, who promoted an alternative demonstration of the foundations of relativity theory based on the notion of a light-ellipsoid. Drawing in part on archival sources, this paper shows how an (...)
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  9. added 2018-09-10
    Poincaré on Clocks in Motion.Scott Walter - 2014 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 47:131-141.
    Recently-discovered manuscripts throw new light on Poincaré’s discovery of the Lorentz group, and his ether-based interpretation of the Lorentz transformation. At first, Poincaré postulated longitudinal contraction of bodies in motion with respect to the ether, and ignored time deformation. In April, 1909, he acknowledged temporal deformation due to translation, obtaining thereby a theory of relativity more compatible with those of Einstein and Minkowski.
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  10. added 2018-09-10
    Henri Poincaré et l’espace-temps conventionnel.Scott A. Walter - 2008 - Cahiers de Philosophie de L’Université de Caen 45:87.
    According to the conventionalist doctrine of space elaborated by the French philosopher-scientist Henri Poincaré in the 1890s, the geometry of physical space is a matter of definition, not of fact. Poincaré’s Hertz-inspired view of the role of hypothesis in science guided his interpretation of the theory of relativity (1905), which he found to be in violation of the axiom of free mobility of invariable solids. In a quixotic effort to save the Euclidean geometry that relied on this axiom, Poincaré extended (...)
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  11. added 2018-07-09
    Relativity Vs. Absolute Simultaneity: Varying Flow of Time or Varying Frequency?Avril Styrman - 2018 - Physics Essays 31 (3):256-284.
    The General Theory of Relativity (GR) and the Dynamic Universe (DU) are evaluated in how they explain frequencies of atomic clocks. DU and GR predict the frequencies with equal accuracy, but their explanations, the postulates they apply in the explanations and the word-views that come along with them are entirely different. The central argument is that if unified and under- standable physics is appreciated, then DU deserves to be taken as a viable alternative to GR. In GR different frequencies of (...)
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  12. added 2018-07-05
    Teleportative Observers Versus Special Relativity Observers: Work in Progress.James Goetz - manuscript
    Various authors argue that special relativity implies eternalism. For example, special relativity observers are limited by the relativity of simultaneity and cannot detect a preferred universal chronology, which is an important premise for the Rietdijk–Putnam argument which implies eternalism. However, I introduce "teleportative observers" which cohere with wormhole theory based on general relativity. Teleportative observers do not teleport objects but use hypothetical teleportative sight to detect every event in every quantum system of the universe. The teleportative sight permits detection at (...)
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  13. added 2018-02-24
    Hybrid Time Physics.Paul Merriam - manuscript
    I accept that McTaggart's A-series and B-series are not inter-reducible and that both are needed for a complete temporal description of a physical system. I consider the Wigner's Friend thought experiment. The A-series are associated with each (quantum) system, and relativity is associated with the B-series. I consider temporal evolution through this 'hybrid' time. We may define the rate of temporal flow as 1 B-series second per A-series second.
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  14. added 2018-02-17
    The Coordinate-Independent 2-Component Spinor Formalism and the Conventionality of Simultaneity.Jonathan Bain - 2000 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 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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  15. added 2018-02-14
    Lucretius On Time and Its Perception.Pamela Zinn - 2016 - Kriterion - Journal of Philosophy 30 (2):125-151.
    This paper analyzes the ontology and epistemology of time in Lucretius’ De rerum natura. It uses the physiology of perception as well as epistemology to shed new light on the metaphysics. It presents an exegesis-based interpretation of the nature of time and of its perception, both arguing for and refining this interpretation by showing its explanatory power. The paper shows that Lucretius represents the perception of time or sensus temporis as a distinct sensory faculty, reconstructs how it emerges and operates, (...)
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  16. added 2017-09-13
    On the Asymmetry of Endurantistic and Perdurantistic Coexistence in Special Relativity.Florian Fischer - 2012 - Philosophia Naturalis 49 (1):43-61.
    The paper reviews Balashov’s Asymmetry Thesis concerning co-existing (point-sized) enduring objects, on the one hand, and perduring ones, on the other. In this regard, it becomes crucial to investigate whether, at a given spacetime point p, it is located only the respective temporal part of a perdur- ing whole, or that whole as well. Two alternatives ought to be distinguished and, then, I will argue as follows: If the perduring whole is located where its parts are, the original asymmetry- thesis (...)
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  17. added 2016-12-08
    Relativity Theory May Not Have the Last Word on the Nature of Time: Quantum Theory and Probabilism.Nicholas Maxwell - 2017 - In G. Ghirardi & S. Wuppulur (eds.), Space, Time and the Limits of Human Understanding. Springer. pp. 109-124.
    Two radically different views about time are possible. According to the first, the universe is three dimensional. It has a past and a future, but that does not mean it is spread out in time as it is spread out in the three dimensions of space. This view requires that there is an unambiguous, absolute, cosmic-wide "now" at each instant. According to the second view about time, the universe is four dimensional. It is spread out in both space and time (...)
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  18. added 2016-07-11
    Time Travel.John-Michael Kuczynski - 2016 - PHILOSOPHYPEDIA.
    It is clearly stated what time-travel would be, were it possible, and it is thereby shown that the very concept of time-travel is incoherent.
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  19. added 2016-07-10
    Aggregative Properties and Emergent Properties.John-Michael Kuczynski - 2016 - Amazon Digital Services LLC.
    It is said what aggregative properties are and also what emergent properties are, and examples are given each of kind of property. It is also explained why, even though all emergent properties are aggregative properties, not all aggregative properties are emergent properties. It is further made clear that, strictly speaking, emergence is a property of one's knowledge of a given kind of aggregate, and not of such aggregates themselves, this being why a property that is emergent at one time will, (...)
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  20. added 2016-06-18
    Bergson: Challenger to Einstein's Theory of Time. [REVIEW]Ray Scott Percival - 2000 - Times Higher Education:1 - 2.
    Henri Bergson is perhaps most remembered for his bold challenge to Einstein's theory of the relativity of simultaneity. Bergson maintained that Einstein's theory did not cope with our intuition of time, which is an intuition of duration. Einstein retorted that there may be psychological time, but there is no special philosopher's time. For Einstein, time forms the fourth dimension of a so-called Parmenidean "block universe". I argue that we must be on our guard not to read into the work of (...)
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  21. added 2016-02-29
    The Relativity of Simultaneity is Not a Temporal Illusion: A Critique of Brogaard and Marlow.Dylan N. Manson - 2014 - Analysis 74 (2):234-236.
    In a recent issue of this journal Berit Brogaard and Kristian Marlow claim that an absolute frame of reference is compatible with Einstein’s Special Relativity. To achieve this they tweak Einstein’s famous train and embankment thought experiment and unjustifiably attribute, to Einstein, Hans Reichenbach’s claim that cause and effect are always temporally separated. Their conclusion is incompatible with the proper Lorentz transformations to show how time dilates from one frame of reference to another; transformations they show no evidence of having (...)
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  22. added 2015-10-29
    Temporal Illusions -- Philosophical Considerations.Sean Enda Power - 2011 - In A. Vatakis, A. Esposito, M. Giagkou, F. Cummins & G. Papadelis (eds.), Multidisciplinary Aspects of Time and Time Perception. Springer. pp. 11-35.
    Does the status of certain temporal experiences as illusory depend on one’s conception of time? Our concept of time in part determines our concept of what we hold to be real and unreal; what we hold to be real and unreal partially determines what we hold to be illusory; thus, our concept of time in part determines what we hold to be illusory. This paper argues that this dependency of illusions on the concept of time is applicable to illusions of (...)
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  23. added 2015-10-14
    Simultaneity, Convention, and Gauge Freedom.Robert Rynasiewicz - 2012 - Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics 43 (2):90-94.
    As is well know from Einstein the choice of a criterion for distant simultaneity is equivalent to stipulating one-way speeds for the transit of light. It is shown that any choice of non-standard synchrony is equivalent to a Lorentz local time boost. From this and considerations from the hole argument, it follows that there is a non-trivial sense in which distant simultaneity is conventional, at least to the extent that the “gauge freedom” arising in the hole argument is non-trivial.
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  24. added 2015-10-14
    Did Malament Prove the Non-Conventionality of Simultaneity in the Special Theory of Relativity?Sahotra Sarkar & John Stachel - 1999 - Philosophy of Science 66 (2):208-220.
    David Malament's (1977) well-known result, which is often taken to show the uniqueness of the Poincare-Einstein convention for defining simultaneity, involves an unwarranted physical assumption: that any simultaneity relation must remain invariant under temporal reflections. Once that assumption is removed, his other criteria for defining simultaneity are also satisfied by membership in the same backward (forward) null cone of the family of such cones with vertices on an inertial path. What is then unique about the Poincare-Einstein convention is that it (...)
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  25. added 2015-08-29
    Causality and Temporal Order in Special Relativity.Hanoch Ben-Yami - 2006 - British Journal for the Philosophy of Science 57 (3):459-479.
    David Malament tried to show that the causal theory of time leads to a unique determination of simultaneity relative to an inertial observer, namely standard simultaneity. I show that the causal relation Malament uses in his proofs, causal connectibility, should be replaced by a different causal relation, the one used by Reichenbach in his formulation of the theory. I also explain why Malament's reliance on the assumption that the observer has an eternal inertial history modifies our conception of simultaneity, and (...)
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  26. added 2015-08-27
    Special Relativity in a Universe of Flowing Time.Ted Dace - 2015 - International Journal of Fundamental Physical Sciences 5 (3).
    By eliminating the need for an absolute frame of reference or ether, Einstein resolved the problem of the constancy of light-speed in all inertial frames but created a new problem in our understanding of time. The resolution of this problem requires no experimentation but only a careful analysis of special relativity, in particular the relativity of simultaneity. This concept is insufficiently relativistic insofar as Einstein failed to recognize that any given set of events privileges the frame in which the events (...)
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  27. added 2015-08-27
    sSecial Relativity and Perception: The Singular Time of Philosophy and Physics.Stephen E. Robbins - 2010 - Journal of Consciousness Exploration and Research 1:500-531.
    The Special Theory of Relativity (STR) holds sway as a theory of time due to its apparently successful predictive structure regarding time-related phenomena such as the increased life spans of mesons or retarded clocks on jets circling the globe, and due to the relativization of simultaneity intrinsic to this theoretical structure. Yet the very structure of the theory demands that such very real physical effects be construed as non-ontological. The scope and depth of this contradiction is explored and, if these (...)
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  28. added 2015-08-13
    Time in Classical and Relativistic Physics.Gordon Belot - 2013 - In Adrian Bardon & Heather Dyke (eds.), A Companion to the Philosophy of Time. Blackwell. pp. 185-200.
    This is a short, nontechnical introduction to features of time in classical and relativistic physics and their representation in the four-dimensional geometry of spacetime. Topics discussed include: the relativity of simultaneity in special and general relativity; the ‘twin paradox’ and differential aging effects in special and general relativity; and time travel in general relativity.
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  29. added 2015-04-07
    The Apparent Nature of Relative Simultaneity.Andrew Wutke - manuscript
    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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  30. added 2015-02-19
    Special Relativity Completed.Ted Dace - manuscript
    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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  31. added 2014-09-10
    A Study on Invariance of Temporal Coincidence.Andrew Wutke - manuscript
    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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  32. added 2014-04-02
    Relativity, Quantum Entanglement, Counterfactuals, and Causation.Luke Fenton-Glynn & Thomas Kroedel - 2015 - British Journal for the Philosophy of Science 66 (1):45-67.
    We investigate whether standard counterfactual analyses of causation 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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  33. added 2014-03-15
    Relativistic Rotation: A Comparison of Theories. [REVIEW]Robert D. Klauber - 2007 - 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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  34. added 2014-03-02
    Causal Order, Temporal Order, and Becoming in Special Relativity.Hanoch Ben-Yami - 2015 - 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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  35. added 2013-12-01
    Simultaneity as an Invariant Equivalence Relation.Marco Mamone-Capria - 2012 - 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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  36. added 2013-12-01
    Conventionality in Distant Simultaneity.Peter Øhrstrøm - 1980 - 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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  37. added 2013-12-01
    Conventionality in Distant Simultaneity.Eugene Feenberg - 1974 - 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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  38. added 2013-11-30
    Simultaneity in Minkowski Spacetime: From Uniqueness to Arbitrariness. [REVIEW]Fabien Besnard - 2012 - 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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  39. added 2012-11-27
    Review of Tim Maudlin's Philosophy of Physics: Space & Time. [REVIEW]Amit Hagar - 2013 - Physics in Perspective (x).
  40. added 2012-01-05
    Book Review. Concepts of Simultaneity: From Antiquity to Einstein and Beyond. Max Jammer. [REVIEW]Jill North - 2008 - American Scienctist 98 (1).
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  41. added 2010-06-22
    The Oxford Handbook of Time.Callender Craig (ed.) - forthcoming - Oxford University Press.
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  42. added 2010-05-14
    Time in the Special Theory of Relativity.Steven Savitt & Roberto Torretti - 2011 - In Craig Callender (ed.), The Oxford Handbook of Philosophy of Time. Oxford University Press. pp. 546--570.
  43. added 2009-07-04
    On Conventionality and Simultaneity - a Reply.Brian Ellis - 1971 - 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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  44. added 2009-06-20
    The Conventionality of Simultaneity.Wesley C. Salmon - 1969 - 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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  45. added 2008-12-31
    A Note on Dolby and Gull on Radar Time and the Twin 'Paradox'.Antony Eagle - 2005 - American Journal of Physics 73 (10):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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