Here\u2019s what you\u2019ll learn when you read this story:<\/p>\n
If time travel is possible, one of the greatest questions is why don\u2019t we see time travelers in the here and now.<\/p>\n
A new theory explores the idea that time travel creates its own destruction by introducing instability into certain realities, which eventually lead to the most stable possible timeline\u2014one without time travel at all.<\/p>\n
The paper admits, however, that the most likely solution to this temporal conundrum is that time travel to the past simply isn\u2019t possible, but exploring alternative explanations is worthwhile.<\/p>\n
Is time travel truly possible<\/a>? The prospect presents its fair share of paradoxes<\/a>.<\/p>\n Of course, there are famous logical examples, such as the Grandfather paradox<\/a>, which explores what would happen if a time traveler killed their grandparent before their parent was conceived (an idea not so far removed from the plot of the sci-fi great Back to the Future<\/a>). Other paradoxes are more concerned with mathematical or physical impossibilities within our current understanding of space-time\u2014even though time travel is theoretically possible through phenomena like closed timelike curves<\/a>.<\/p>\n But maybe the biggest paradox of all is also the simplest one: If time travel were possible, wouldn\u2019t we encounter these temporal tourists all the time? Physicist Stephen Hawking<\/a> even threw a time traveler party in 2009, providing details of the event only after the fact<\/a> in the hopes of enticing some would-be time travelers\u2014obviously, Hawking partied alone. Because the world isn\u2019t awash with Marty McFlys, maybe that means time travel isn\u2019t possible after all.<\/p>\n Unfortunately, when it comes to the ins and outs of something immensely complicated like time travel, things are rarely so simple.<\/p>\n In a new study, Andrew Jackson\u2014a research associate from the School of Informatics\u2014explores reasons beyond the scientific or technological as to why time travel appears to be impossible (at least, in this reality). Published in the preprint journal arXiv and titled \u201cWhere Are All the Tourists From 3025?<\/a>,\u201d the study posits that maybe time travel itself is a self-suppressing phenomenon.<\/p>\n \u201cI conclude that, assuming my model, time travel is self-suppressing: the timeline is continually rewritten until it inevitably reaches a timeline with no time machines ever being constructed, \u201c Jackson wrote. \u201cAt this point, no further changes to the timeline are possible.\u201d<\/p>\n Jackson illustrates this idea with what\u2019s known as a Markov chain<\/a>, named after Russian mathematician Andrey Markov, which describes a sequence of possible events wherein the probability of those events depends only on the current state. In the paper, Jackson shows that introducing time travel into any timeline would create dynamic instability<\/a> that would eventually (at least, statistically) create a timeline where time travel was never invented, which is the most stable state for any timeline. The process of this continuous timeline change would, however, feel instantaneous to non-time travelers such as you and I.<\/p>\n Why would this happen this way? Well, in classical physics<\/a>, objects will always return to their most stable state, such as a hot coffee cooling to room temperature<\/a>. If time machines introduce temporal instability, then timelines will similarly default to the most stable state, which would be a timeline with no time machines at all.<\/p>\n \u201c[The paper] shows that time travel\u2014by enabling timeline alterations\u2014induces a dynamic instability that\u2014with very high probability\u2014leads to its own erasure,\u201d Jackson wrote. \u201cThis self-suppressing mechanism results in the asymptotic convergence of all timelines toward states in which no time machines ever exist.\u201d<\/p>\n Of course, Jackson admits that time travel simply being impossible is the most simple (and likely) solution. But exploring alternative explanations why we don\u2019t see a sky full of DeLoreans is still one worth pondering.<\/p>\n \u201cIt may simply not be possible to travel through time,\u201d Jackson wrote. \u201cThis may be the true solution\u2014Occam\u2019s razor would suggest so\u2014but it is not definitively the case.\u201d<\/p>\n You Might Also Like<\/p>\n","protected":false},"excerpt":{"rendered":"Here\u2019s what you\u2019ll learn when you read this story: If time travel is possible, one of the greatest…\n","protected":false},"author":2,"featured_media":137892,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32],"tags":[86159,79,86160,68895],"class_list":["post-137891","post","type-post","status-publish","format-standard","has-post-thumbnail","category-science","tag-andrew-jackson","tag-science","tag-time-travel","tag-timeline"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts\/137891","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/comments?post=137891"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts\/137891\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/media\/137892"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/media?parent=137891"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/categories?post=137891"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/tags?post=137891"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}