- Will human beings in the future spacecraft in the sky? (maybe not.)
- you can reason time travel usage time quantum Physics is all about probability.
- We need to already have a time machine for people to return to.
Last month, a British astronaut made news When he mentions someone’s theory, the UFOs in our skies could be future Humanity looks back at us. Tim Peake is a decorated test pilot, the first European Space Agency (ESA) astronaut from the UK, and has spent half a year in space, including the International Space Station (ISS) more time; he answered the question with humor and skepticism.
But it got me thinking.
Time travel is an iconic storytelling mechanic.It’s hard to pinpoint what the story of the first trip was, but people point to HG Wells’ novel Time Machine As a first description, well, a Time machine. Previously, stories like Rip Van Winkle The stretching of time is alluded to, but by supernatural rather than mechanical means. In the more than a century since Wells’ influential novel, time travel fiction has become almost an entire genre of its own.
People travel through time in machines; they seem to do it No Machines; they disappear into time-different pocket dimensions or alternate realities. Sometimes, like the Stephen King story”short journey“Someone disappeared through the cracks and re-emerged much older. In the greatest episode of all time”inner light” Star TrekCaptain Picard’s life was in an is abnormal. Time has passed for them, but their pocket dimension exists outside of regular time.
The way people wave time travel in fiction is creative — but how would it work in real life? Can it even? How do we begin to explain the idea of future humans visiting us by stepping back in time?
You might think that the issue of time travel raises a lot of questions, and many of them could be deal breakers when arguing about the potential of time travel. There’s nothing wrong with that, but there’s a very basic problem that underlies all other types of theories and basically separates scientists who do rigorous work from people who are a little bit dreamy. We can dream, but it’s not the same as a peer-reviewed quantum mechanics paper in terms of the scientific work we can use.
The key question is about directionality.Almost all credible people agree if Time travel is possible, and it’s most likely going in the direction time has gone forward — basically accelerating the way we already experience the passage of time. There are some ways that the universe naturally “time travels” in this way, such as a person’s time passing relativistically in space versus on the ground. There are some physical examples all around us that could eventually lead to time travel.
but can travel back Is it timely? This requires more mental gymnastics. We’re surrounded by novels where people just randomly jump around in time, but a mechanism that enables one direction may not enable the other, and vice versa. There are some theories about backward time travel, like maybe something far away, it involves a wormhole that is stationary on one side and very, very fast on the other, creating a kind of temporal anomaly. And, of course, quantum physics.
Fabio Costa is a quantum physicist at the University of Queensland in Australia. In 2020, he collaborated with a student on an article entitled “Reversible kinetics with closed time-like curves and free choice. In the paper, they explain the grandfather paradox, a thought experiment about time travel. What if you went back in time and killed your own grandfather? That would mean you didn’t exist and therefore couldn’t kill you grandfather.
So what if it was possible to go back in time, as it seems possible within some framework of quantum mechanics? Can we avoid the paradox? Costa and his team found that free agents on the trip could exercise their free will without affecting what they can find now. The grandfather paradox may not be a problem at all. I have a feeling that people doing research on this topic will answer my questions about a future where people examine us from space. (Costa gave me serious information, but I had fun knowing we were just thinking about it.)
“A common feature of all time travel models is that it is impossible to go back to time before the time machine was first invented,” Costa explained in an email. “In a sense, going back in time requires two doors, one in the future and one in the past. You can only go back when someone has opened the door to the past. So, people from the future can’t visit us… …unless someone has invented a time machine and no one knows!”
This means that time travel may feel like the beginning of a relationship in a way. When you meet a new friend, you start a mental timer, and if you’re together, you’ll pass milestones while remembering your first date. Unless your first date was to complete your new time machine, you could literally go back and relive that date if you wanted to. After all this time, you can tell your past self not to eat garlic bread!
If someone invented that time machine, it would make sense that they wouldn’t play it, because there’s really nothing to show until more time has passed. But it’s hard to imagine anyone keeping it a secret for more than a week or so. If you can send someone back in a week, that’s already a great deal! ! Even if Costa’s thesis is correct, agents of the past may not have a meaningful impact on what is happening now, but one would still want to try to disarm mass shooters, not to mention more common things like bad contracts .
A major group in time travel thinking relies on multiple universes, which means that decisions ripple through different versions of the universe. By stepping back in time, you simply approach a different version of yourself from an alternate world. Another hypothesis might be that there is only one (or no) shared reality, but the probability part of quantum mechanics simply doesn’t allow the paradox to happen. Like, you might go back in time and try to kill your grandfather, but whatever tiny possibility you miss every shot has to be a reality.
This means that if we do see future humans flying in friendly skies and try not to break first orderquantum probability can explain why we somehow no way See them or find their ship. “That leaves the question: where is the time machine?” Costa said. Unless it’s also positioned in space in some way, these ships will come in and out from somewhere and take off. If the machine had to work today in order for us to entertain future visitors, we wouldn’t be able to build that machine in the sky.
So that’s another little paradox – but it probably won’t stop us from continuing to make up more stories about time travel.
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