Backwards time travel would allow for causal loops involving events, information, people or objects whose histories form a closed loop, and thus seem to "come from nowhere." The notion of objects or information which are "self-existing" in this way is often viewed as paradoxical, with several authors referring to a causal loop involving information or objects without origin as a bootstrap paradox, an information paradox, or an ontological paradox. The use of "bootstrap" in this context refers to the expression "pulling yourself up by your bootstraps" and to Robert A. Heinlein's time travel story "By His Bootstraps". The term "time loop" is sometimes used to refer to a causal loop, but although they appear similar, causal loops are unchanging and self-originating, whereas time loops are con

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dbo:abstract
  • Une boucle de causalité, dans le contexte de voyage dans le temps ou de la rétro-causalité, est une séquence d'événements (d'actions, d'informations, d'objets, de personnes) dans laquelle un événement est en partie la cause d'un autre événement, qui à son tour est l'une des causes du premier événement mentionné. Un tel lien de causalité en boucle existe dans l'espace-temps, mais son origine ne peut être déterminée. Un exemple théorisé d'une boucle de causalité est donné par une boule de billard frappant ses dernières versions: la boule de billard se déplace en suivant un certain itinéraire vers une machine à voyager dans le temps, et la même boule de billard future sort de la machine à voyager dans le temps avant que sa soi passée ne soit entrée dans la machine, donnant à sa version passée un coup oblique, altérant la trajectoire passée de la boule et faisant en sorte qu'elle entre dans la machine temporelle avec un angle qui va provoquer que sa version future frappe sa version passée avec le même coup oblique qui a altéré son chemin. (fr)
  • O paradoxo de bootstrap, ou paradoxo ontológico, é um paradoxo da viagem no tempo em que as informações ou objetos podem existir sem ter sido criados. Após informações ou um objeto ser enviado de volta no tempo, ele recuperado no presente torna-se o próprio objeto ou informação que foi inicialmente levado de volta no tempo em primeiro lugar. Inúmeras histórias de ficção científica se baseiam nesse paradoxo, que também tem sido objeto de artigos de física grave. O paradoxo de bootstrap conecta de uma forma insana o passado e o futuro, tornando-se de uma certa forma até contraditório. É quase como um loop de acontecimentos que só foram possíveis porque algo do futuro interveio; o acontecimento acaba se tornando o causador dele mesmo. Um exemplo atual da ocorrência desse paradoxo é o que aconteceu na nona temporada da premiada série britânica Doctor Who, no episódio Before the Flood e em muitos outros episódios da mesma série. O termo "paradoxo do bootstrap" refere-se à expressão "puxando-se pelos cadarços de seu próprio calçado"; o uso do termo para o paradoxo de viagem no tempo foi popularizado pela história de Robert A. Heinlein By His Bootstraps. (pt)
  • Причи́нно-сле́дственная петля́, называемая также, причинной петлёй — временной парадокс, в котором повторяющаяся последовательность событий является взаимной причиной друг друга. (ru)
  • Backwards time travel would allow for causal loops involving events, information, people or objects whose histories form a closed loop, and thus seem to "come from nowhere." The notion of objects or information which are "self-existing" in this way is often viewed as paradoxical, with several authors referring to a causal loop involving information or objects without origin as a bootstrap paradox, an information paradox, or an ontological paradox. The use of "bootstrap" in this context refers to the expression "pulling yourself up by your bootstraps" and to Robert A. Heinlein's time travel story "By His Bootstraps". The term "time loop" is sometimes used to refer to a causal loop, but although they appear similar, causal loops are unchanging and self-originating, whereas time loops are constantly resetting. An example of a causal loop paradox involving information is given by Everett: suppose a time traveler copies a mathematical proof from a textbook, then travels back in time to meet the mathematician who first published the proof, at a date prior to publication, and allows the mathematician to simply copy the proof. In this case, the information in the proof has no origin. A similar example is given in the television series Doctor Who of a time-traveler who copies Beethoven's music from the future and publishes it in Beethoven's time in Beethoven's name. Everett gives the movie Somewhere in Time as an example involving an object with no origin: an old woman gives a watch to a playwright who later travels back in time and meets the same woman when she was young, and gives her the same watch that she will later give to him. Krasnikov writes that these bootstrap paradoxes - information or an object looping through time - are the same; the primary apparent paradox is a physical system evolving into a state in a way that is not governed by its laws. He does not find this paradoxical, and attributes problems regarding the validity of time travel to other factors in the interpretation of general relativity. A 1992 paper by physicists Andrei Lossev and Igor Novikov labeled such items without origin as Jinn, with the singular term Jinnee. This terminology was inspired by the Jinn of the Quran, which are described as leaving no trace when they disappear. Lossev and Novikov allowed the term "Jinn" to cover both objects and information with reflexive origin; they called the former "Jinn of the first kind", and the latter "Jinn of the second kind". They point out that an object making circular passage through time must be identical whenever it is brought back to the past, otherwise it would create an inconsistency; the second law of thermodynamics seems to require that the object become more disordered over the course of its history, and such objects that are identical in repeating points in their history seem to contradict this, but Lossev and Novikov argued that since the second law only requires disorder to increase in closed systems, a Jinnee could interact with its environment in such a way as to regain lost order. They emphasize that there is no "strict difference" between Jinn of the first and second kind. Krasnikov equivocates between "Jinn", "self-sufficient loops", and "self-existing objects", calling them "lions" or "looping or intruding objects", and asserts that they are no less physical than conventional objects, "which, after all, also could appear only from either infinity, or a singularity." The term predestination paradox is used in the Star Trek franchise to mean "a time loop in which a time traveler who has gone into the past causes an event that ultimately causes the original future version of the person to go back into the past." This use of the phrase was created for a sequence in a 1996 episode of Star Trek: Deep Space Nine titled "Trials and Tribble-ations", although the phrase had been used previously to refer to belief systems such as Calvinism and some forms of Marxism which encouraged followers to strive to produce certain outcomes while at the same time teaching that the outcomes were predetermined. Smeenk and Morgenstern use the term "predestination paradox" to refer specifically to situations in which a time traveler goes back in time to try to prevent some event in the past, but ends up helping to cause that same event. (en)
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  • Причи́нно-сле́дственная петля́, называемая также, причинной петлёй — временной парадокс, в котором повторяющаяся последовательность событий является взаимной причиной друг друга. (ru)
  • Une boucle de causalité, dans le contexte de voyage dans le temps ou de la rétro-causalité, est une séquence d'événements (d'actions, d'informations, d'objets, de personnes) dans laquelle un événement est en partie la cause d'un autre événement, qui à son tour est l'une des causes du premier événement mentionné. Un tel lien de causalité en boucle existe dans l'espace-temps, mais son origine ne peut être déterminée. Un exemple théorisé d'une boucle de causalité est donné par une boule de billard frappant ses dernières versions: la boule de billard se déplace en suivant un certain itinéraire vers une machine à voyager dans le temps, et la même boule de billard future sort de la machine à voyager dans le temps avant que sa soi passée ne soit entrée dans la machine, donnant à sa version passée (fr)
  • O paradoxo de bootstrap, ou paradoxo ontológico, é um paradoxo da viagem no tempo em que as informações ou objetos podem existir sem ter sido criados. Após informações ou um objeto ser enviado de volta no tempo, ele recuperado no presente torna-se o próprio objeto ou informação que foi inicialmente levado de volta no tempo em primeiro lugar. Inúmeras histórias de ficção científica se baseiam nesse paradoxo, que também tem sido objeto de artigos de física grave. O paradoxo de bootstrap conecta de uma forma insana o passado e o futuro, tornando-se de uma certa forma até contraditório. É quase como um loop de acontecimentos que só foram possíveis porque algo do futuro interveio; o acontecimento acaba se tornando o causador dele mesmo. Um exemplo atual da ocorrência desse paradoxo é o que acon (pt)
  • Backwards time travel would allow for causal loops involving events, information, people or objects whose histories form a closed loop, and thus seem to "come from nowhere." The notion of objects or information which are "self-existing" in this way is often viewed as paradoxical, with several authors referring to a causal loop involving information or objects without origin as a bootstrap paradox, an information paradox, or an ontological paradox. The use of "bootstrap" in this context refers to the expression "pulling yourself up by your bootstraps" and to Robert A. Heinlein's time travel story "By His Bootstraps". The term "time loop" is sometimes used to refer to a causal loop, but although they appear similar, causal loops are unchanging and self-originating, whereas time loops are con (en)
rdfs:label
  • Boucle causale (fr)
  • Paradoxo de bootstrap (pt)
  • Причинно-следственная петля (ru)
  • 因果循环 (zh)
  • Causal loop (en)
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