#closed timelike curves

[notwiselybuttoowell]

The recent research explores the possibility of closed-timelike curves, or CTCs—a hypothetical pathway back in time. The curve is a worldline—the arc of a particle in spacetime over the course of its existence—that runs backwards. Steven Hawking posited in his 1992 “Chronology protection conjecture” paper that the laws of physics don’t allow for closed timelike curves to exist—thus, that time travel is impossible. “Nevertheless,” the recent study authors wrote, “they can be simulated probabilistically by quantum-teleportation circuits.”

The team’s Gedankenexperiment goes like this: Physicists put photonic probes through a quantum interaction, yielding a certain measurable result. Based on that result, they can determine what input would have yielded an optimal result—hindsight is 20/20, just like when you can look over a graded exam. But because the result was yielded from a quantum operation, instead of being stuck with a less-than-optimal result, the researchers can tweak the values of the quantum probe via entanglement, producing a better result even though the operation already happened. Capiche?

The team demonstrated that one could “probabilistically improve one’s past choice,” explained study co-author Nicole Yunger Halpern, a physicist at the National Institute of Standards and Technology and the University of Maryland at College Park, in an email to Gizmodo, though she noted that the proposed time travel simulation has not yet taken place. 

[shadowseductress]

do you think time travel will be possible ? specially going back in time

well the idea of time travel, especially going back in time, is fascinating, but from a scientific perspective, time travel to the future is theoretically more plausible based on Einstein's theory of relativity, which suggests that time dilation can occur at speeds close to the speed of light or in strong gravitational fields.

Traveling back in time presents more challenges and paradoxes, such as the famous "grandfather paradox," where changes to the past could create inconsistencies. Theoretical models like wormholes and closed timelike curves have been proposed as potential mechanisms, but they remain speculative and face significant practical and theoretical hurdles.

[emo-space-wizard]

I think that new applicants are being put off by the baseless and unfounded rumours of the last few being driven to gibbering madness :(

Following 73 spell matrix explosions and at least two inadvertently created magic dead zones, I think I will stop trying to devise a ritual to determine from a description of an arbitrary computer program and an input, whether the program will finish running, or continue to run forever.

[hra-official]

The Timelines are Intersecting Again

We did change this account's profile picture to the new logo, so that's why there are two pictures with the same name. I still don't get how the past pfp can appear to have reblogged a post that was made after it was changed.

Bates?

Textbook case of a Closed Timelike Curve. It just means that a stable paradox was created.

Why would us putting up some files cause a stable time paradox.

Remember how you used some of the data you got from Rev's casket? And remember how them and this company came into contact during a competition to supply Baronic Unified Command for a burn weapon? And remember how you wouldn't have managed to submit a design if I hadn't manifested in Tallgrass' Lich and unhinged the local chronology to give you more time?

Long story short, several of the printcodes only exist due to a temporal anomaly, so the timeline had to form a closed curve in order to stabilize.

[stars-and-darkness]

FIC REC FRIDAY!!!

week #23

Closed Timelike Curve by LaLainaJ (@lalainajanes)

One minute Caroline's with her friends, losing a fight with some witches. The next she's in Klaus' bed but he's not even a little bit happy to see her. Because he's convinced that she's been dead for 27 years.

this such an insane au, oh my god. i would eat up hundreds upon thousands of words of this, but also, it’s possible that i wouldn’t be able to handle it, so maybe it’s better that it’s just a sneak peek.

[lovelanguageisolate]

@etirabys: puts in DoorDash order huh. It will be here in...-126 minutes.

@eightyonekilograms: it's going back through time.

Me: Whoa. I can already tell DoorDash's new tachyon-based delivery tech will be a huge hit.

---

5 min later

Me, increasingly concerned: you know, it's only a matter of time before DoorDash realizes they can build a computer based on a closed timelike curve, which means they'll be able to solve PSPACE-complete problems in polynomial time.

81k: was gonna say, they'll be able to send stock orders and troop movements back in time.

Me: yeah, unless someone wrests control from them, DoorDash will be world hegemon in a week or two. We need to stop them.

[larkral]

Chapter 11: Justin wakes up to his phone alarm.

Chapter 12: Holster ropes him into all kinds of errands in between classes.

Chapter 13: "Hey, bro, mind if I snuggle up?"

Chapter 14: That's the thing about a CTC: it definitionally prevents a paradox.

Chapter 15: "There's always tomorrow, bro."

Chapter 16: Turns out Holster is a very good student when he has the right motivation. 

Chapter 17: Holster hums in the back of his throat.

Friday Prime

"What's happening?" Holster asks. "Friday," Justin smiles back over his shoulder and bops his head to the tune. "Bro, it's Saturday. We had a game and a haus party last night."

Friday, February 19th just can't give it a rest.

[ddelline]

things I've researched and somewhat learned of through writing cv/sm aka time loop!fic

the concept and counting of international atomic time

planck time

sliding mode control

newcomb's paradox

the alcubierre metric/drive

closed timelike curves

the equation/formula for conditional probability

quantum suicide/quantum immortality and the many-worlds interpretation

[hasufin]

Recipe sins

We're all familiar with the online recipe which consists of 87 pages of some awful story about the author's supposed relationship with their grandmother and how important this food is to them, yada yada, and you have to scroll through all of it, close 18 popups, and maybe eventually get to the recipe.

But I'm thinking other sins in the recipes themselves which ought be banned, or at least consign the recipe writer to 18 days of eating nothing but dry cereal. Sins like:

Calling for multiple fresh ingredients which cannot all be acquired at the same time. Yes, I'm sure your tomato-strawberry-basil salad is a lovely thing. But tomatoes are a late summer/early fall thing, while strawberries are in the spring. The produce shipping industry thanks you.

Using trivial amounts of obscure ingredients which are only sold in large quantities. That tablespoon of pomegranate molasses surely brings the barbecue sauce together, but I've never seen the stuff sold in anything less than 300ml quantities.

A recipe which was obviously scaled up or down and never tested. It's cute that this is actually what Red Lobster uses to make 8 dozen biscuits, but when you scale it down you may observe that eggs do not come in halves.

When different parts of the recipe are not on the same scale. I do not know what magic makes you believe that 2 cups of dough will hold 12 cups of filling, but I guess I'm going to be doing something else with all this ravioli filling, aren't I?

Made entirely to look good in pictures but allergic to spices, apparently. For some reason this is a particular flaw of vegan recipes. Herbs and spices are vegan and do not contain calories. Food does not have to taste like cardboard to be healthy.

Ingredients ambiguous as to whether they should be cooked or uncooked. This especially happens with grains: 1 cup rice: cooked? Uncooked?

Wildly underrepresenting the cook times. No, onions cannot be caramelized in ten minutes. Well, they can if you're using a closed timelike curve in a Lorentzian Manifold, but those are not found in a typical home kitchen.

Randomly calling for an ingredient in a step without listing it in the ingredients list. I will forgive you for water, but nothing else.

Clustering steps into long and ridiculous paragraphs. No, the step cannot be "Cream the butter with the sugar, then combine, alternating the milk and dry ingredients. Scrap into a prepared loaf pan and bake in a preheated oven until a toothpick comes out clean." That's at least three steps, hon.

Including ingredients which were not using in the instructions. If it's in the list, it's supposed to be used!

Using stock photos for your result. No, seriously, this is a thing they do. And the people who do this should have an eye removed for doing so.

Substituting a different and unusable ingredient because you assume your audience won't be able to find the thing you used in your home country. Yes, I get it, sahlab powder is a lovely thickening agent. And cornstarch is a lovely thickening agent. The two are not the same, and you cannot substitute one for the other.

I'm sure there are others, but these are the ones I can think of off the top of my head. Some online recipes just... won't work. And it's really frustrating.

[hasufin]

Okay, so Stephen Baxter is hard SF, of the extremely crunchy variety. Like, I'm not entirely keen on the plot but that man can TOTALLY explain how stars work.

The photino birds are the overall antagonists of the Xeelee Cycle. While we get very little interaction with the Xeelee or the photino birds, they're the prime motivators of the plot. The Xeelee are the pinnacle of baryonic life; they live in and/or are part of the event horizons of black holes; they have utilized closed timelike curves (time travel) to modify their own evolution, having created an "anti-Xeelee", an intelligence which moves backwards in time in order to coordinate their work (it's not "anti" as in "opposed" by "anti" as in "opposite", like electrons and positrons).

The Xeelee are at war with these creatures which are referred to as "photino birds". These creatures are composed of photinos - dark matter - and exist independent of time as we know it. While the Xeelee regularly use time travel, the photino birds just are. While Xeelee live in the event horizons of black holes, the photino birds exist in the gravity wells of much smaller stars. They are intelligent and in order to prevent things like supernovae which would destroy the environment they prefer, they instead use various means to dampen nuclear fusion and knock stars off main sequence - their goal is to create a universe of red dwarf stars, which is anathemic to life like ours (we need main sequence stars) and also to the Xeelee who need supermassive black holes.

Now, the photino birds, being dark matter, are basically immune to most forces which can be brought to bear against them, the sole exception being gravity. However, they also don't experience TIME as we understand it, not even in the "timelike curve within a Riemann Manifold" was the Xeelee do, which means it's basically impossible to outmanuever them. It's also impossible to distinguish between them, so it's possible that every photino bird is the same individual having used what we'd call time travel for duplication (this is a real theory about certain subatomic particles, that there's actually only one existing in every time and place where it can be found).

Anyway, the photino birds are not dissimilar from your 4th-dimensional salmon; it's never clear if they're actually intelligent and self-aware as we'd understand it, it's impossible to communicate with them in a meaningful way. They're simply intent on modifying the entire universe into their ideal environment and because of their existence beyond time, they can do it.

a five year old note among my 1588 saved notes that just reads: four-dimensional salmon

[ourrobotculture]

Tipler Cylinder

A Tipler Cylinder, also known as a Tipler time machine, is a hypothetical concept from the field of theoretical physics. It’s theorized to be a massive, infinitely long cylinder that spins around its longitudinal axis. This rotation is believed to create a frame-dragging effect, which could theoretically warp spacetime around it. The warping would be such that it might allow for closed timelike curves, which are paths in spacetime that return to their starting point in time. This means, in theory, if a spacecraft were to navigate a precise spiral path around this cylinder, it could travel back in time.

However, it’s important to note that the practicality of such a time machine is highly questionable. For the mathematics to work, the cylinder would need to be infinitely long, and even then, it would require negative energy to function, which is not something we currently understand how to create or harness. So, while it’s a fascinating concept that sparks the imagination, it remains firmly in the realm of science fiction for now.

Chapter One: The Arrival

The air was crisp and the sky a clear blue as John Tiberius stepped out of the Tipler cylinder, his heart racing with the thrill of the unknown. He had done it. He had traveled back in time to 1875, to a small North Dakota town that was nothing more than a blip on the historical radar. The cylinder, a marvel of 22nd-century engineering, hummed quietly behind him, its surface cool and smooth to the touch.

John adjusted the collar of his modern jacket, an anachronism in this era of dust and horses. He couldn’t help but marvel at the simplicity of life here, so far removed from the technological wonders of his own time. The townspeople eyed him with a mixture of curiosity and suspicion, their gazes lingering on his strange attire and the odd, cylindrical contraption he had emerged from.

As he made his way through the town, John’s attention was caught by a woman standing outside the local general store. She was unlike any other person he had seen so far; her posture exuded confidence, and her eyes held an intelligence that seemed to pierce through the very fabric of time. She was dressed plainly, yet there was an elegance about her that transcended the fashion of the day.

“Good day, sir,” she greeted him, her voice carrying a hint of an accent he couldn’t quite place. “You’re new around here, aren’t you?”

John nodded, unsure how much he should reveal. “Yes, I am. Just passing through,” he replied, hoping his vague answer would suffice.

The woman smiled, and it was as if the sun had broken through the clouds. “Well, if you’re in need of any assistance, my name is Elizabeth. I’m somewhat of an inventor myself, and I have a keen interest in new technologies.”

John’s interest was piqued. An inventor? In 1875? He couldn’t have stumbled upon a more perfect ally. “Actually, Elizabeth, I could use some help. You see, I’m not just new to town—I’m new to this time.”

Elizabeth’s eyes widened, but she didn’t seem fazed. “Is that so? Well, Mr…?”

“Tiberius. John Tiberius.”

“Mr. Tiberius, why don’t we find a quiet place to talk? I have a feeling we have much to discuss.”

And with that, John followed Elizabeth, his mind racing with possibilities. What secrets did this extraordinary woman hold? And how would their meeting change the course of history?

As they walked, the Tipler cylinder behind them remained silent, a sentinel to the incredible journey that had just begun.

[explainpleaseuk]

Delve into the fascinating concept of closed timelike curves and their potential to enable time travel within the framework of general relativity.

[the-matrix-network-news]

How To Building a Time Machine

Introduction The idea of time travel has been a fascinating subject in science fiction for decades. While time machines as portrayed in movies and books remain purely theoretical, scientists and theorists have explored various concepts and theories regarding how a time machine could potentially work. In this article, we'll delve into some of these theoretical ideas and discuss the challenges and possibilities associated with each.

Theory 1: Wormholes and Einstein-Rosen Bridges

One of the most popular theories for time travel involves the concept of wormholes or Einstein-Rosen bridges. According to Einstein's theory of general relativity, it's theoretically possible for these wormholes to exist. A wormhole could create a shortcut through spacetime, potentially allowing for time travel. However, these theoretical wormholes remain purely speculative and come with various challenges, such as their stability and the requirement of exotic matter to keep them open.

Theory 2: Faster-Than-Light Travel

Another concept for time travel involves traveling faster than the speed of light, which is currently considered impossible according to the theory of special relativity. Some theories suggest that if we could somehow exceed the speed of light, we might experience time dilation effects that could enable time travel. This concept, however, is highly theoretical and has not been demonstrated in reality.

Theory 3: Closed Timelike Curves (CTCs)

A closed timelike curve is a path through spacetime that returns to the same point in both space and time. Some theories propose that manipulating the geometry of spacetime to create CTCs might allow for time travel. However, this concept raises paradoxes like the famous "grandfather paradox," where one could potentially change the past, creating logical inconsistencies.

Theory 4: Quantum Mechanics and Time Travel

Quantum mechanics introduces the concept of "quantum tunneling" in which particles can seemingly teleport through energy barriers. Some theories suggest that harnessing quantum effects could lead to time travel possibilities. However, the challenges of scaling quantum phenomena to macroscopic objects and avoiding paradoxes remain significant obstacles.

Conclusion

While time travel continues to capture the imagination of science fiction enthusiasts, it remains purely theoretical in the realm of science. Theories and concepts such as wormholes, faster-than-light travel, closed timelike curves, and quantum mechanics offer intriguing ideas, but practical implementation remains elusive. As of now, time machines are still the stuff of fiction, and the laws of physics, as we currently understand them, do not provide a clear path to building one.

Disclaimer

This article is for entertainment and speculative purposes only. Time travel remains a concept rooted in science fiction and theoretical physics. No practical time machines exist, and the ideas presented here are purely hypothetical. For more articles on intriguing scientific concepts and the latest in speculative science, visit The Matrix Network News and follow us on Instagram. Please note that the article contains a disclaimer to clarify that it's for entertainment and speculative purposes and that time travel remains theoretical and fictional. Read the full article

[hasufin]

1) If my blood sugar drops - and I can feel it - my IQ drops like 50 points. I go from “So we can navigate a closed timelike curve through a Riemann Maniflold, but the gravitational forces preclude any actual particles from surviving the trip” to “Ugh hit bunny and eat”.

2) There are a lot of things which will deplete both our water reserves and our water-soluble vitamins. That’s basically most of what a hangover is, and after ANY intense activity you will do well to replenish both. A liter of gatorade and 2 liters of water will often work wonders. If you wake up feeling like shit, it’s probably the way to go even if you don’t think you were drinking that much or working that hard.

As a biochem student and certified nerd, I feel the responsibility to bestow this knowledge upon as many people as I possibly can:

You do NOT need to "earn" meals through exercise.

You know why?

Because exercise only accounts for about 20% of your calories. The majority of the calories your body burns, it uses to keep itself alive. It uses them to power your brain and metabolism. In fact, your brain ALONE is responsible for spending about 20% of your calories.

Your BRAIN, just to keep itself going, uses up just as many (or even more!!!) calories than all the exercise you do.

Your RESTING metabolic rate is responsible for burning between 60 and 75% of your calories.

You don't just deserve food because you're working out. YOU DESERVE FOOD BECAUSE YOUR BODY NEEDS IT TO STAY ALIVE.

[dakotayounger]

Time rudder.