Time Travel

Edited by Sam Baron (Australian Catholic University)
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  1. Potentials of Future-Viewing Machines.Aaron M. Feeney - manuscript
    {June 2018 UPDATE: This work has been greatly surpassed by "Utilizing Future-Viewing Instruments" which will appear in the July 2018 issue of Progress in Physics. It can now be downloaded in PDF form from their website.} -/- The introduction of new scientific instruments has always played a vital role in the advancement of science and society. All scientific instruments to date have only been able to gain information pertaining to events of our immediate and distant past. Concerning our attempts to (...)
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  2. La philosophie du voyage dans le temps.Nicolae Sfetcu - manuscript
    L'éternalisme soutient que le passé et le futur existent réellement, en partant de l’idée que le temps est une dimension similaire aux dimensions spatiales, que les événements passés et futurs sont « présents » sur l’axe du temps, mais cette opinion est contestée. Dans la vision à quatre dimensions, l'univers est une topologie espace-temps existante, contenant tout ce qui s'est passé, tout ce qui se passe et tout ce qui va se passer. Il en résulte qu'il n'y a aucun moment (...)
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  3. Buclele cauzale în călătoria în timp.Nicolae Sfetcu - manuscript
    În această lucrare analizez posibilitatea călătoriei în timp pe baza mai multor lucrări de specialitate, printre care cele ale lui Nicholas J.J. Smith ("Time Travel", The Stanford Encyclopedia of Philosophy”), William Grey (”Troubles with Time Travel”), Ulrich Meyer (”Explaining causal loops”), Simon Keller și Michael Nelson (”Presentists should believe in time-travel”), Frank Arntzenius și Tim Maudlin ("Time Travel and Modern Physics") și David Lewis (“The Paradoxes of Time Travel”). Lucrarea începe cu o Introducere în care fac o scurtă prezentare a (...)
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  4. Paradoxuri cauzale în călătoria în timp.Nicolae Sfetcu - manuscript
    Orice teorie care ar permite călătoria în timp ar introduce probleme de cauzalitate. Aceste tipuri de paradoxuri temporale pot fi evitate prin principiul de consecvență Novikov sau printr-o variație a interpretării multor lumi cu lumi care interacționează. Argumentul clasic împotriva cauzalității înapoi este argumentul bilking, Dacă un eveniment A provoacă un eveniment anterior B, bilking recomandă o încercare de a decorela A și B, adică de a aduce A în cazurile în care B nu a avut loc și de a (...)
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  5. Causal Loops in Time Travel.Nicolae Sfetcu - manuscript
    About the possibility of time traveling based on several specialized works, including those of Nicholas J. J. Smith ("Time Travel"), William Grey (”Troubles with Time Travel”), Ulrich Meyer (”Explaining causal loops”), Simon Keller and Michael Nelson (”Presentists should believe in time-travel”), Frank Arntzenius and Tim Maudlin ("Time Travel and Modern Physics"), and David Lewis (“The Paradoxes of Time Travel”). The article begins with an Introduction in which I make a short presentation of the time travel, and continues with a History (...)
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  6. Paradoxe du grand-père.Nicolae Sfetcu - manuscript
    L'exemple le plus connu de l'impossibilité de voyager dans le temps est le paradoxe du grand-père ou l'argument de l'auto-infanticide: une personne qui voyage dans le passé et tue son propre grand-père, empêchant ainsi l'existence d'un de ses parents et donc sa propre existence. Une réponse philosophique à ce paradoxe serait l'impossibilité de changer le passé, (à l'instar du principe de cohérence de Novikov. Le paradoxe du grand-père implique toute action qui change le passé. Il se présente sous de nombreuses (...)
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  7. Călătoria în timp.Nicolae Sfetcu - manuscript
    Călătoria în timp implică deplasarea într-un timp diferit de cel prezent, în trecut sau în viitor, în principiu fără o deplasare în spațiu cu referire la un sistem de coordonate local. Călătoria în timp poate fi făcută de un corp material care poate fi sau nu o ființă vie, și pentru care se folosește de obicei un dispozitiv special denumit mașina timpului. Călătoria în timp este un concept recunoscut în filosofie și știință, dar a cărui posibilitatea este foarte disputată, dând (...)
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  8. Space, Time, and Time Travel.Nicolae Sfetcu - manuscript
    Newton supported the idea of absolute time, unlike Leibniz, for which time is only a relation between events and cannot be expressed independently, a statement in concordance with the relativity of space-time. Eternalism claims that the past and the future exist in a real sense, going to the idea that time is a dimension similar to spatial dimensions, that future and past events are "present" on the axis of time, but this view is challenged. On four-dimensional vision, the universe is (...)
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  9. Filosofia călătoriei în timp – Paradoxul bunicului.Nicolae Sfetcu - manuscript
    Newton a susținut ideea timpului absolut, spre deosebire de Leibniz pentru care timpul este doar o relație între evenimente și nu poate fi exprimat în mod independent, afirmație în concordanță ci relativitatea spațiu-timpului. Eternismul susține că trecutul și viitorul există într-un sens real, mergându-se până la ideea că timpul este o dimensiune similară cu dimensiunile spațiale, că evenimentele viitoare și trecute sunt "prezente" pe axa timpului, dar această opinie este contestată. Cel mai cunoscut exemplu de imposibilitate a călătoriei în timp (...)
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  10. Time Travel.Nicolae Sfetcu - manuscript
    Time travel is a recognized concept in philosophy and science, but whose scope is highly disputed, giving rise to numerous paradoxes in both philosophy and science. Time travel is considered by some accepted both in general relativity and quantum mechanics, but there is a unanimous consensus that it is not feasible with current technology. (Hawkins 2010) The raised issues are different for the time travel in the past compared to the time travel in the future.
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  11. Grandfather Paradox in Time Travel.Nicolae Sfetcu - manuscript
    The most well-known example of the impossibility of traveling in time is the grandfather paradox or self-infanticide argument: a person who travels in the past and kills his own grandfather, thus preventing the existence of one of his parents and thus his own existence. A philosophical response to this paradox would be the impossibility of changing the past, like Novikov self-consistency principle (if an event exists that would cause a paradox or any "change" to the past whatsoever, then the probability (...)
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  12. Voyage dans le temps.Nicolae Sfetcu - manuscript
    Une autre définition du voyage dans le temps (Arntzenius 2006) (Smeenk and Wüthrich 2011) l'assimile à l'existence des courbes temporelles fermées, une variété lorentzienne d'une particule matérielle dans l'espace-temps qui revient à son point de départ. Certains auteurs acceptent l’existence de deux dimensions temporelles et d’autres envisagent des scénarios comportant plusieurs univers « parallèles », chacun ayant son propre espace-temps à quatre dimensions.Mais la question est de savoir si un voyage dans une autre dimension temporelle ou dans un autre univers (...)
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  13. La causalité dans le voyage dans le temps.Nicolae Sfetcu - manuscript
    Certains scientifiques et philosophes sont d’avis que toute théorie permettant un voyage dans le temps introduirait des problèmes de causalité. Ces types de paradoxes temporels peuvent être évités grâce au principe de cohérence de Novikov ou à une variation de l'interprétation des mondes multiples avec des mondes en interaction. L'argument classique contre la causalité rétrograde est l'argument du contournement. La causalité implique un avenir ontologiquement fermé - une position métaphysique sur le temps communément appelée l'éternalisme, une forme spécifique de non-présentisme. (...)
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  14. Boucles causales dans le voyage dans le temps.Nicolae Sfetcu - manuscript
    À propos de la possibilité de voyager dans le temps sur la base de plusieurs ouvrages spécialisés, notamment ceux de Nicholas J. J. Smith (« Time Travel »), William Grey (« Troubles with Time Travel »), Ulrich Meyer (« Explaining causal loops »), Simon Keller and Michael Nelson (« Presentists should believe in time-travel »), Frank Arntzenius and Tim Maudlin (« Time Travel and Modern Physics »), et David Lewis (« The Paradoxes of Time Travel »). L'article commence par une (...)
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  15. Back to the Future: Curing Past Sufferings and S-Risks Via Indexical Uncertainty.Alexey Turchin - manuscript
    The long unbearable sufferings in the past and agonies experienced in some future timelines in which a malevolent AI could torture people for some idiosyncratic reasons (s-risks) is a significant moral problem. Such events either already happened or will happen in causally disconnected regions of the multiverse and thus it seems unlikely that we can do anything about it. However, at least one pure theoretic way to cure past sufferings exists. If we assume that there is no stable substrate of (...)
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  16. 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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  17. Time Travel and Coincidence-Free Local Dynamical Theories.Giuliano Torrengo - forthcoming - Synthese (11):4835-4846.
    I criticize Lockwood’s solution to the “paradoxes” of time travel, thus endorsing Lewis’s more conservative position. Lockwood argues that only in the context of a 5D space-time-actuality manifold is the possibility of time travel compatible with the Autonomy Principle. I argue that shifting from 4D space-time to 5D space-time-actuality does not change the situation with respect to the Autonomy Principle, since the shift does not allow us to have a coincidence-free local dynamical theory.
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  18. Back to the (Branching) Future.Giacomo Andreoletti - 2020 - Acta Analytica 35 (2):181-194.
    The future is different from the past. What is past is fixed and set in stone. The future, on the other hand, is open insofar as it holds numerous possibilities. Branching-tree models of time account for this asymmetry by positing an ontological difference between the past and the future. Given a time t, a unique unified past lies behind t, whereas multiple alternative existing futures lie ahead of t. My goal in this paper is to show that there is an (...)
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  19. Time Travel and the Immutability of the Past Within B-Theoretical Models.Giacomo Andreoletti & Giuliano Torrengo - 2019 - Philosophia 47 (4):1011-1021.
    The goal of this paper is to defend the general tenet that time travelers cannot change the past within B-theoretical models of time, independently of how many temporal dimensions there are. Baron Pacific Philosophical Quarterly, 98, 129–147 offered a strong argument intended to reach this general conclusion. However, his argument does not cover a peculiar case, i.e. a B-theoretical one-dimensional model of time that allows for the presence of internal times. Loss Pacific Philosophical Quarterly, 96, 1–11 used the latter model (...)
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  20. The End of Mystery.Sam Baron & Mark Colyvan - 2019 - American Philosophical Quarterly 56 (3):247-264.
    Tim travels back in time and tries to kill his grandfather before his father was born. Tim fails. But why? Lewis's response was to cite "coincidences": Tim is the unlucky subject of gun jammings, banana peels, sudden changes of heart, and so on. A number of challenges have been raised against Lewis's response. The latest of these focuses on explanation. This paper diagnoses the source of this new disgruntlement and offers an alternative explanation for Tim's failure, one that Lewis would (...)
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  21. Multilocation Without Time Travel.Justin Mooney - 2019 - Erkenntnis:1-14.
    Some philosophers defend the possibility of synchronic multilocation, and have even used it to defend other substantive metaphysical theses. But just how strong is the case for the possibility of synchronic multilocation? The answer to this question depends in part on whether synchronic multilocation is wedded to other controversial metaphysical notions. In this paper, I consider whether the possibility of synchronic multilocation depends on the possibility of time travel, and I conclude that the answer hinges on the nature of time (...)
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  22. Review of Paradoxes of Time Travel. [REVIEW]Giacomo Andreoletti - 2018 - Argumenta 6:381-384.
    Book review of Wasserman, R. (2017), Paradoxes of Time Travel, OUP.
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  23. If Time Travel to Our Location is Possible, We Do Not Live in a Branching Universe.James Norton - 2018 - Analysis 78 (2):260-266.
    This paper argues for the following disjunction: either we do not live in a world with a branching temporal structure, or backwards time travel is nomologically impossible, given the initial state of the universe, or backwards time travel to our space-time location is impossible given large-scale facts about space and time. A fortiori, if backwards time travel to our location is possible, we do not live in a branching universe.
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  24. Time Travel and the Movable Present.Sara Bernstein - 2017 - In John Keller (ed.), Being, Freedom, and Method: Themes from the Philosophy of Peter van Inwagen. pp. 80-94.
    In "Changing the Past" (2010), Peter van Inwagen argues that a time traveler can change the past without paradox in a growing block universe. After erasing the portion of past existence that generates paradox, a new, non-paradox-generating block can be "grown" after the temporal relocation of the time traveler. -/- I articulate and explore the underlying mechanism of Van Inwagen's model: the time traveler's control over the location of the objective present. Van Inwagen's model is aimed at preventing paradox by (...)
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  25. Is Some Backwards Time Travel Inexplicable?Kristie Miller - 2017 - American Philosophical Quarterly 54 (2):131-141.
    It has been suggested that there is something worrisome, puzzling, or incomprehensible about the sorts of causal loops sometimes involved in backwards time travel. This paper disentangles two distinct puzzles and evaluates whether they provide us reason to find backwards time travel incomprehensible, inexplicable, or otherwise worrisome. The paper argues that they provide no such reason.
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  26. A Blast From The Past.Kristie Miller - 2017 - The Philosophers' Magazine 77:82-86.
    That we find the idea of travelling in time, and in particular travelling backwards in time, fascinating, is evidenced by the plethora of new science fictions shows depicting time travel that hit our TV screens in 2016. I love time travel shows, and I can hardly keep up. In almost all cases these shows depict what philosophers call inconsistent time travel stories: stories that commit what my colleague Nick Smith (The University of Sydney) calls the second time around fallacy. These (...)
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  27. The Metaphysics of Mortals: Death, Immortality, and Personal Time.Cody Gilmore - 2016 - Philosophical Studies 173 (12):3271-3299.
    Personal time, as opposed to external time, has a certain role to play in the correct account of death and immortality. But saying exactly what that role is, and what role remains for external time, is not straightforward. I formulate and defend accounts of death and immortality that specify these roles precisely.
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  28. Time-Traveling Image: Gilles Deleuze on Science-Fiction Film.Joshua M. Hall - 2016 - Journal of Aesthetic Education 50 (4):31-44.
    The first section of this article focuses on the treatment of “time travel” in science-fiction literature and film as presented in the secondary literature in that field. The first anthology I will consider has a metaphysical focus, including (a) relating the time travel of science fiction to the banal time travel of all living beings, as we move inexorably toward the future; and (b) arguing for the filmstrip as the ultimate metaphor for time. The second anthology I will consider has (...)
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  29. Vor dem Starten ankommen. Über Zeitreisen und Warp-Antriebe.Kay Herrmann - 2016 - Universitätsverlag Chemnitz.
    Time travel and superluminal travel are two of mankind's dreams. They inspire our imagination and provide material for bizarre stories. -/- A work on the subject of time travel and superluminal travel forces us to re-examine our concept of "time". The complexity and the contradictory nature this subject makes it difficult to be more precise about "time". On its deepest subjective side, time is a means of perception, a biological rhythm, a social phenomenon in terms of our collective understanding of (...)
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  30. Free Will and Time Travel.Neal A. Tognazzini - 2016 - In Meghan Griffith, Neil Levy & Kevin Timpe (eds.), The Routledge Companion to Free Will. New York: Routledge. pp. 680-690.
    In this chapter I articulate the threat that time travel to the past allegedly poses to the free will of the time traveler, and I argue that on the traditional way of thinking about free will, the incompatibilist about time travel and free will wins the day. However, a residual worry about the incompatibilist view points the way toward a novel way of thinking about free will, one that I tentatively explore toward the end of the chapter.
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  31. Nowhere Man: Time Travel and Spatial Location.Sara Bernstein - 2015 - Midwest Studies in Philosophy 39 (1):158-168.
    This paper suggests that time travelling scenarios commonly depicted in science fiction introduce problems and dangers for the time traveller. If time travel takes time, then time travellers risk collision with past objects, relocation to distant parts of the universe, and time travel-specific injuries. I propose several models of time travel that avoid the dangers and risks of time travel taking time, and that introduce new questions about the relationship between time travel and spatial location.
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  32. How to Change the Past in One-Dimensional Time.Roberto Loss - 2015 - Pacific Philosophical Quarterly 96 (1):1-11.
    The possibility of changing the past by means of time-travel appears to depend on the possibility of distinguishing the past as it is ‘before’ and ‘after’ the time-travel. So far, all the metaphysical models that have been proposed to account for the possibility of past-changing time-travels operate this distinction by conceiving of time as multi-dimensional, and thus by significantly inflating our metaphysics of time. The aim of this article is to argue that there is an intuitive sense in which past-changing (...)
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  33. Modal Persistence and Modal Travel.Kristie Miller & Michael Duncan - 2015 - Ratio 28 (3):241-255.
    We argue that there is an interesting modal analogue of temporal persistence, namely modal persistence, and an interesting modal analogue of time travel, namely modal travel. We explicate each of these notions and then argue that there are plausible conditions under which some ordinary objects modally persist. We go on to consider whether it is plausible that any modally persistent objects also modally travel.
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  34. Real Presence in the Eucharist and Time-Travel.Martin Pickup - 2015 - Religious Studies 51 (3):379-389.
    This article aims to bring some work in contemporary analytic metaphysics to discussions of the Real Presence of Christ in the Eucharist. I will show that some unusual claims of the Real Presence doctrine exactly parallel what would be happening in the world if objects were to time-travel in certain ways. Such time-travel would make ordinary objects multiply located, and in the relevantly analogous respects. If it is conceptually coherent that objects behave in this way, we have a model for (...)
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  35. Reasons-Responsiveness and Time Travel.Yishai Cohen - 2014 - Journal of Ethics and Social Philosophy (3):1-7.
    I argue that the theory of moral responsibility defended by John Martin Fischer and Mark Ravizza is incompatible with the metaphysical possibility of time travel.
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  36. Occupy Wall: A Mereological Puzzle and the Burdens of Endurantism.Paul Richard Daniels - 2014 - Australasian Journal of Philosophy 92 (1):91-101.
    Endurantists have recently faced a mereological puzzle in various forms. Here I argue that, instead of presenting a genuine worry, the puzzle actually reveals a common misunderstanding about the endurantist ontology. Furthermore, through this discussion of the alleged problem and the misunderstanding which motivates it, I reveal metaphysical commitments the endurantist has that may not be widely recognized. For instance, she is committed to interesting and perhaps controversial views about shape and location. I highlight these commitments and what they mean (...)
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  37. Understanding Future-Viewing Machines and Time Travel.Aaron M. Feeney - 2014 - Aaron M. Feeney.
    {June 2018 UPDATE: This work has been greatly surpassed by "Utilizing Future-Viewing Instruments" which will appear in the July 2018 issue of Progress in Physics. It can now be downloaded in PDF form from their website.} This is the full text of the paper that was published as a Kindle book on April 6th, 2014. In most respects, it has since been surpassed by "Potentials of Future-Viewing Machines," which is available here in this repository. Nevertheless, this earlier work addresses minutia (...)
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  38. Due osservazioni sulla metafisica della prescienza.Andrea Guardo - 2013 - Lebenswelt 3 (1):47-57.
    The paper discusses two problems concerning the metaphysics of foreknowledge. In the first section I focus on an argument that purports to show that there is no such a thing. In the second one I discuss the relation between the foreknowledge of our own behaviour and what we may call "the phenomenology of freedom". As for the first issue, I employ David Lewis’ discussion of the Grandfather Paradox to argue that the argument in question overlooks a key feature of the (...)
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  39. Time Travel and Time Machines.Douglas Kutach - 2013 - In Adrian Bardon & Heather Dyke (eds.), A Companion to the Philosophy of Time. Blackwell.
    Thinking about time travel is an entertaining way to explore how to understand time and its location in the broad conceptual landscape that includes causation, fate, action, possibility, experience, and reality. It is uncontroversial that time travel towards the future exists, and time travel to the past is generally recognized as permitted by Einstein’s general theory of relativity, though no one knows yet whether nature truly allows it. Coherent time travel stories have added flair to traditional debates over the metaphysical (...)
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  40. What Time Travelers Cannot Not Do (but Are Responsible for Anyway).Joshua Spencer - 2013 - Philosophical Studies 166 (1):149-162.
    The Principle of Alternative Possibilities is the intuitive idea that someone is morally responsible for an action only if she could have done otherwise. Harry Frankfurt has famously presented putative counterexamples to this intuitive principle. In this paper, I formulate a simple version of the Principle of Alternative Possibilities that invokes a course-grained notion of actions. After warming up with a Frankfurt-Style Counterexample to this principle, I introduce a new kind of counterexample based on the possibility of time travel. At (...)
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  41. Yet Another Confusion About Time Travel.Giuliano Torrengo - 2013 - Disputatio 5 (35):49-56.
    I argue that, contrary to an idea to be found in popularizations of time travel, one cannot more easily multiply oneself by taking younger versions of oneself back in time than by travelling back in time on one’s own. The reason is that the suggested multiplication of the traveller is, from a global perspective, only apparent.
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  42. Back to the Present: Defending Presentist Time Travel.Paul Richard Daniels - 2012 - Disputatio 4 (33):469 - 484.
    Here I defend the compatibility of presentism and time travel against a few objections. Keller and Nelson argue that, if presentism is at all plausible, presentism and time travel are as compatible as eternalism and time travel. But Miller and Sider are not convinced. I reply that for their concerns to have merit, Miller and Sider must assume presentists are committed to positions they need not be; I explain why presentists are not so committed and, in the process, defend Keller (...)
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  43. What Are Centered Worlds?Shen-yi Liao - 2012 - Philosophical Quarterly 62 (247):294-316.
    David Lewis argues that centered worlds give us a way to capture de se, or self-locating, contents in philosophy of language and philosophy of mind. In recent years, centered worlds have also gained other uses in areas ranging widely from metaphysics to ethics. In this paper, I raise a problem for centered worlds and discuss the costs and benefits of different solutions. My investigation into the nature of centered worlds brings out potentially problematic implicit commitments of the theories that employ (...)
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  44. Location and Perdurance.Antony Eagle - 2010 - In Dean Zimmerman (ed.), Oxford Studies in Metaphysics: Volume 5. Oxford Univerity Press. pp. 53-94.
    Recently, Cody Gilmore has deployed an ingenious case involving backwards time travel to highlight an apparent conflict between the theory that objects persist by perduring, and the thesis that wholly coincident objects are impossible. However, careful attention to the concepts of location and parthood that Gilmore’s cases involve shows that the perdurantist faces no genuine objection from these cases, and that the perdurantist has a number of plausible and dialectically appropriate ways to avoid the supposed conflict.
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  45. Coinciding Objects and Duration Properties: Reply to Eagle.Cody Gilmore - 2010 - In Dean Zimmerman (ed.), Oxford Studies in Metaphysics: Volume 5. Oxford University Press. pp. 95-111.
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  46. Destiny in Harry Potter.Jeremy Pierce - 2010 - In Gregory Bassham (ed.), The Ultimate Harry Potter and Philosophy: Hogwarts for Muggles.
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  47. It Doesn't Matter What We Do: From Metaphysics to Ethics in Lost's Time Travel.Jeremy Pierce - 2010 - In Sharon Kaye (ed.), Ultimate Lost and Philosophy: Think Together, Die Alone. Wiley/Blackwell.
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  48. What Time Travelers May Be Able to Do.Peter B. M. Vranas - 2010 - Philosophical Studies 150 (1):115 - 121.
    Kadri Vihvelin, in "What time travelers cannot do" (Philos Stud 81: 315-330, 1996), argued that "no time traveler can kill the baby who in fact is her younger self, because (V1) "if someone would fail to do something, no matter how hard or how many times she tried, then she cannot do it", and (V2) if a time traveler tried to kill her baby self, she would always fail. Theodore Sider (Philos Stud 110: 115-138, 2002) criticized Vihvelin's argument, and Ira (...)
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  49. Do the Laws of Physics Forbid the Operation of Time Machines?John Earman, Chris Smeenk & Christian Wüthrich - 2009 - Synthese 169 (1):91 - 124.
    We address the question of whether it is possible to operate a time machine by manipulating matter and energy so as to manufacture closed timelike curves. This question has received a great deal of attention in the physics literature, with attempts to prove no- go theorems based on classical general relativity and various hybrid theories serving as steps along the way towards quantum gravity. Despite the effort put into these no-go theorems, there is no widely accepted definition of a time (...)
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  50. Time Travel Without Causal Loops.Bradley Monton - 2009 - Philosophical Quarterly 59 (234):54-67.
    It has sometimes been suggested that backwards time travel always incurs causal loops. I show that this is mistaken, by describing worlds where backwards time travel occurs and yet no causal loops occur. Arguments that backwards time travel can occur without causal loops have been given before in the literature, but I show that those arguments are unconvincing.
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