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Five Features of Multiverse Time Travel: How Past Paradoxes Can Be Avoided in the Future

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JOURNAL OF SCIENCE FICTION Volume 2, Issue 1, September 2017 ISSN 2472-0837 Five Features of Multiverse Time Travel: How Past Paradoxes Can Be Avoided in the Future Morgan Luck, Charles Sturt University Abstract: The aim of this paper is to help construct coherent time travel narratives by establishing five features of multiverse time travel. To this end, multiverse time travel will be contrasted to fixed-universe time travel, and both versions related to various cases - where each case is designed to illustrate a key feature of multiverse time travel. Keywords: time travel; multiverse; fixed universe; narratives; paradoxes 1.0 - Introduction Although there has been growing philosophical el are introduced. It is these types of problems treatment of multiverse time travel (Abbruzzese, that writers may wish to avoid, consumers may 2001; Effingham, 2012), no work has been solely wish to spot, and scholars may wish to study; dedicated to a formulation of the key features this paper aims to help us in these respects. of this type of time travel. This paper aims to However, just as importantly, this paper also aims redress this vacuum by establishing five key to encourage discussion on some interesting, features of multiverse time travel. These features and subtle, distinctions between different types are established to help the construction of more of multiverse time travel that have not yet been coherent multiverse time travel narratives. That given adequate attention. is, it is hoped that if fictional worlds are con- structed with these features in mind, they will We begin with a brief overview of a well-known avoid inconsistencies common to such worlds. To time travel paradox, the grandfather paradox. We this end, multiverse time travel will be contrasted shall use this paradox to introduce and contrast to fixed-universe time travel, and both versions fixed-universe and multiverse time travel. We related to various cases - where each case is de- shall also discover why Superman’s efforts to signed to introduce one, or more, key features of save Lois Lane are thwarted under both theories multiverse time travel. of time travel. To help illustrate why identifying such features 2.0 – The grandfather paradox might be important to creators, consumers, and scholars of time travel narratives, consider the The grandfather paradox can be presented as following simple, and typical, example of time follows: travel from the popular 1978 film Superman. In this film Lois Lane (with whom Superman is in If you could travel into the past then you love) is killed. Consequently, Superman goes could kill your own grandfather at a time 1 back in time and saves her. Despite its simplic- before your father’s conception, so prevent- ity, there are problems this narrative; problems ing your own birth, which would prevent you that render it impossible for Superman to save from traveling into the past, and so prevent Lois under either multiverse or fixed-universe you from killing your grandfather before your time travel. These problems will be made clear in father’s conception. the next section, after both theories of time trav- 54 JOURNAL OF SCIENCE FICTION Volume 2, Issue 1, September 2017 ISSN 2472-0837 Five Features of Multiverse Time Travel, continued This case highlights the notion that backwards According to fixed-universe time travel, if you time travel seems paradoxical - it appears to were to travel back in time intent on killing your both allow and deny the same event (the killing grandfather before your father’s conception, you of your grandfather). It is because of this ap- would fail. Although killing your grandfather may parent paradox that some have argued against be something well within your power to accom- the possibility of time travel (Mellor, 1998, p. 135; plish, you will not. The facts are determined to Hawking, 1992, p. 604). The simplest form of this stop you. For example, although you could travel argument can be presented as follows, back in time, locate your grandfather, and line up a lethal shot with your rifle, the rifle would jam, or 1. If backwards time travel is possible, then a you would have a heart attack, or you would slip paradox is possible. on a banana peel, and so on; and these defeat- ing factors will continue to pop up for as long as 2. It is not the case that a paradox is possible. you keep attempting the feat (Goddu, 2007). (It is because you are completely unable to kill your So, grandfather that Deutsh and Lockwood (1994) have argued that fixed-universe time travel invalidates the Feature of Autonomy. According 3. It is not the case that backwards time trav- to this feature it should be “possible to create in el is possible. our immediate environment any configuration of matter that the laws of physics permit locally, Most analytic philosophers take the truth of without reference to what the rest of the uni- 2 Premise 2 for granted. So, on the assumption verse may be doing” (p. 71)) that backwards time travel could occur (or one wishes to construct a coherent time travel narra- In short, nothing a backwards time traveller does tive), one must reject Premise 1 of this argument. in the past can alter it. This is what it means for a universe to be fixed – all the events are fixed, that A common objection to Premise 1 is that it is is, unalterable. Or, put another way, everything not traveling back in time itself that gives rise a backwards time traveller does in the past has potential paradoxes. It is altering the past that already occurred that way. This is why narratives does so. As a consequence a number of different that involve changing the past cannot occur versions of time travel have arisen that allows under fixed-universe time travel. So, although one to travel backwards in time, but not alter Superman might be permitted to travel back in the past. In this paper, we will focus on two of time, under fixed-universe time-travel he would these: fixed-universe time travel and multiverse be unable (contrary to the film) to save Lois time travel. Let us begin with fixed-universe time Lane. Narratives that operate under fixed-uni- travel. verse time travel will be more akin the 1995 film Twelve Monkeys, where the actions of the pro- Although the focus of this paper is not on tagonist James Cole (portrayed by Bruce Willis) fixed-universe time travel, a very brief introduc- fail to cause any deviation from a future that tion to this version of time travel may help, as a must come to pass. counterpoint, to better illustrate multiverse time travel. According to fixed-universe time travel, all Fixed-universe time travel denies the truth of past events are fixed in time (Dwyer, 1975; Lewis, Premise 1 of the argument against time travel by 1976; Brown, 1992; Vihvelin, 1996). So if an event providing the conditions under which time travel occurs, it is set in stone. The past is unalterable. is possible, but a paradox is not. That is, traveling (In some versions it is not only the past that is back in time is not possibly paradoxical, provid- fixed, but all present and future events also.) ing the past is not altered. Let us now contrast 55 JOURNAL OF SCIENCE FICTION Volume 2, Issue 1, September 2017 ISSN 2472-0837 Five Features of Multiverse Time Travel, continued this version of time travel to multiverse time The grandfather paradox was introduced to help travel. illustrate some important features of multiverse time travel.3 The three key features introduced by An alternative version of backwards time travel this example are as follows. is multiverse time travel. It, too, rejects Premise 1 of the argument against backwards time travel Multiverse time travel: If, at time (t), x time travels by asserting that altering the past (i.e. one’s own to some prior instant (t-y), then: past) is impossible. However, it still allows for the possibility that one might cause events that did (a) x departs from Universe A at t, and ar- not occur in one’s own past, to occur in a past rives in Universe B at t-y; qualitatively identical to your own, up until the moment you change it. (b) Universes A and B are qualitatively identi- cal up until t-y; According to multiverse time travel, when a time traveller travels back in time, they don’t arrive in (c) at t-y, the only difference between Uni- the past of their universe (that is, the universe verses A and B is that x is present in B, but from which they came). Rather, the act of their not in A. travelling back locates them in a child universe. This child universe is qualitatively identical to the In order to help us flesh out further key features parent universe the time traveller departed from, of multiverse time travel, we shall now examine up until the moment they arrive, and from then some further cases. The next case is the boot- on it is different. For example, if a time traveller strap paradox. goes back in time one hour, say from 2:00pm to 1:00pm, they depart the parent universe 3.0 – The bootstrap paradox at 2:00pm and arrive in the child universe at 1:00pm, where both parent and child universes are qualitatively identical up until 1:00pm. Consider the following case: Like fixed-universe time travel, if you were to An older version of yourself arrives from the decide to go back in time to kill your grandfather future and gives you the plans to build a time before your father’s conception, you would, again machine and then disappears.
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