Time travel Definition and 351 Threads

I think that we travel to future all the time. As all intertial frame of motion is relative. We are currently travelling at very high speeds with relative to a particle accelerator's particle and time is slowing down for us with relative to the particle. I think so we are also travelling to...

Are there any images to show CTC such as many images are available in Google to show curvature of general relativity. As far as I understand two points of space time fabric are curved and joined . If we travel from one point to future we will again come back to the same point and now we are in...

In a recent experiment published on 5 September 2024 by a physicist at the University of Toronto called Aephraim M. Steinberg and his team in a study called "Experimental evidence that a photon can spend a negative amount of time in an atom cloud", that involved shooting photons through a cloud...

Hi everyone I'm a mild physics enthusiast but I wonder if people thought time travel was technically possible? And if Nalini's thoughts were sound on a scientific basis.

Hello, I have an idea of a fiction. The main character from Russia considers himself a contactee, and through quantum pseudo-telepathy he interacts, as it seems to him, with extraterrestrial civilizations, but in fact these are employees of the Time Patrol from the year 2500. Fortunately for...

I was watching John Michael Godier and he mentioned that since quantum measurements can change the measurement in the past (known as a delayed choice quantum eraser); that you potentially could send a message back in time. You would however have to hope the someone does the same measurement in...

I remember one of the Ant-Man movies had time travel enabled by shrinking down to an incredibly small size. This seemed silly to me at first but then I realized that a second is much closer to the age of the universe than a Planck time is to a second. This is mind-boggling and the human brain...

The premise is straight forward: A physicist from 100 years in the future grants a serious Q&A with physicists of today by issuing tickets whereby the questioners had to choose to attend one of three consecutive one hour sessions, A, B, or C. The physicist from the future tells everyone that he...

Ridiculous! I know. But as a 9th grader, there are a few things that have been bugging me. I had a conceptualisation of how 'time travel' could work. However, it's based on the presumption ( a very large one at that) that the many-worlds interpretation of quantum mechanics is correct...

This might seem like a rather peculiar observation and question. However, a rather strange physical anomaly was noted about a decade ago. While gazing thorough a living-room window. A flying-insect was seen with a portion of its torso fixed within the pane of glass. It seemed, as if, it...

Hello I have a question about space. I am no physicist nor student of any kind of science but I'm curious and I've heard some things about the speeding up of the expansion of the universe which got me thinking... If the expansion is accelerating without end and believed to even surpass the...

I subscribe to this forum because I like science. I think science is the future and I don't know why but I think that time travel is possible with science. I looking article about this subject and this is amazing. I want to learning more about time travel and other science subjects. Thanks for...

https://www.scientificamerican.com/article/is-time-travel-possible/

So at first I thought that the time would be 10 years, and that I’d have to consider the outbound motion as v = .87c and inbound motion as v = -.87c but I’m struggling with addition of the velocities and whether or not this is even the right approach?

I like time travel for entertainment purposes in books/movies but there’s one fundamental flaw I haven’t seen discussed. Any time travel example without the use of a ‘gate’ or wormhole (Star Gate SG1 for example) focuses on time only. The problem with these is you need to firstly travel in time...

General relativity permits some exact solutions that allow for time travel. Some of these exact solutions describe universes that contain closed timlike curves, or world lines that lead back to the same point in spacetime. I wondered if these solutions also permits Causal loops? Such as the one...

Hi! I want to start with saying that I'm not an expert on these type of problems, but I will be gratefull for some calarifications. I've heard that there's nothing in psysics that says that time travel is impossible. I want to make a case with the time traveling battery. Could be any mass with...

Is time travel possible in Newtonian curved spacetime?

If time travel were possible, could someone alter or set up the way they want things to happen before they went back to their desired destination?

Assumptions: There is no "absolute" time, time is all relative. Taking the twins paradox as an example, both twins measure a different proper time when they re-unite due to each twin taking paths of differing lengths through spacetime. Conclusion: Time Travel itself is a completely...

In my search about time travel for Is it possible or just a fictional thing as many of our estimed scientists and researchers have theoreticalize the time travel some how possible I have found some interesting information and articles regarding the the possibility of time travel and enlisting...

hi users, I'm a new member of the forum. My question is about time travel in the quantum world. I am aware of the enormous limitations, but my topic is about individual particles and their ability to travel through time, is that possible for them? My question comes from a speech by an important...

Summary:: Sci-Fi author looking for science advisor Hi everyone :) I have just completed the first draft of a novel and am looking for someone to review the science and confirm I'm not wildly off base, misunderstanding, or otherwise talking out of my ass before I begin the edits for the...

So picture this, its 2500 and you want to time travel back to 2300 to kill your great grandfather, this obviously creates a paradox wherein you prevent yourself from being born right? Well why don't you use your year 2500 technology to create a clone of your grandfather to replace him after (or...

The reason why I think it could happen is that spacetime is being curved really extremely in black holes and when you draw a chart of spacetime near and in black hole , you can see that time axis is being bend towards the center of black hole and that thing is happening from all sides of the...

Hello, I am currently reading "The first Fifteen Lifes of Harry August" from Catherine Webb and really like it so far. I did not even read the half or so but there was an interesting idea I would like to discuss about. As far as I understand Harry August does return after dying to the same...

I've got a good conceptual understanding of relativity (not maths based,) but the one thing which I can't quite get my head around is being able to influcence my casual past. I can picture being able to leave my light cone with faster than light travel, but not to the point where I could go...

For case B- Conditions: 1. The observer was observing since the time they were in contact. 2. There are only 2 directions for motion: back and forward. 3. Relative velocity is not equal to zero. 4. Bodies are moving away from each other Time difference = t Relative velocity = v Distance between...

It shows theory of time machine proved, what's the exact point that stopping our scientists to create time machine in reality?

And also an answer to 'where are the future time travellers?'. Let's say hypothetically that in the future time travel into the past is invented. To me many worlds looks like metaphysics, but it appears to be taken seriously by physicists, therefore, what if after traveling backwards in time as...

An electron in my gold tooth travels somewhat over half the speed of light. I don't know the math, but let's say I age 10 years for every 1 year for the electron. Suppose we had a way where that electron could trigger a counter each time it "experienced" sunrise. (Let's don't get into how the...

Professor Ron Mallett is claiming that time travel is possible using lasers. I've put this in general for a reason (I was considering putting this in the sci fi section) Article here https://www.cnn.com/travel/article/time-travel-ron-mallett-scn/index.html What I would like to ask is regarding...

Summary:: Which form of time travel would be considered more close to reality: The Flash or Avengers:Endgame? Which form of time travel would be considered more close to reality: The Flash or Avengers:Endgame?

Hi, I recently learned that if you can travel at the speed of light, or nearly, you can reach the Andromeda Galaxy within 30 years, due to time dilation and bypassing 2.5 million years on Earth. Is this true?

Even if we manage to travel back in time, according to relativity, we could never travel to a moment before we started our journey, right? So in particular I could not enjoy some moments again with a relative that passed away, say 10 years ago?

Time travel teleportation can be achieved in small scale experiment in millisecond. Using a computer byte in radio signals. I look forward for comments.

Could a particle be sent back in time on it's world line? Time is defined by events, but at absolute zero, there is no movement or vibration of a particle - does not time cease to pass then at absolute zero for the particle? If the particle was somehow brought below absolute zero, could it be...

So, I have this idea for the FTL engine for artistic purposes and I wanted to ask if anybody could point out it's flaws. I would greatly appreciate if you were willing to discuss them further. It is just a rough summary, so if you want me to disclose more details, ask away. The idea is as...

i don't understand, how does quantum eraser not imply time travel? i firmly don't believe in retrocausality, but it really does seem to imply it . can someone please explain in layman terms? in here paul davies says observers now can "constrain" the past, does this mean our perception of...

My background is that I'm an applied mathematician and engineer, self-taught in GR and QFT. It's an old idea, in some dozen or so SciFi books. But I'm looking for a mathematical framework for handling it. The second law of thermodynamics, that entropy always increases in a closed system, can be...

I was watching a Science Channel show on time travel (though I don't recall the title) and in this show (I hope I get this right from memory, correct me if need be) they stated without proof that 'if something happened in the past is must have always have happened that way', and when they posit...

Hi I'm currently writing a YA novel where the protagonist needs to leave Earth to save his mother. Meanwhile, the protagonist's mother is back on earth. I would prefer if he could be back "instantly". Superluminal traveling is possible in this story. If the protagonists travels at...

Although we can't technically do this currently, what if we could? What would be a reason to send a person on a mission into the future? If Bob travels at near the speed of light from Earth for let's say 5 years and then returns to see Alice. Alice has, and in fact the entire population of Earth...

Does anybody have any references where Einstein speaks about Time Machines? From collected sources I found, he strongly rejected the idea of Time Machine but through his theory implied that time travel may be possible if wormholes existed. Something needs to be infinitely fast to do this? Have...

How can we travel back and forth in time? And is it really possible?

I've seen across the internet the explanations of why (ignorind wind) the time an airplane takes to travel from one place to another on Earth is the same regardless of its direction of flight. The explanations usually rely on using reference frames. But I thought of one that I think is more...

Hi. Perhaps it falls into a fallacy similar to the attempt to deny the Second Principle of Thermodynamics, misrepresenting the statistical and probabilistic interpretation. I will also expose what causes me curiosity. My cell phone and the base of the service communicate with each other because...

Hey. I know I asked questions about time travel before, but I'm just really interested in it. So, you know the phrase 'Future events cannot effect past events'. Well, in certain movies (eg. Groundhog Day) time keeps resetting, so future events don't effect past events in this scenario. So...

This is a possible science-fiction scenario, and I'm wondering if it is scientifically plausible. If someone wanted to take a one-way trip into future, say 1000 years from now, then SR gives you a possible way to do it without dying of old age: Just hop in a rocket ship, accelerate to nearly...

I asked myself this question today, found that exact question asked here (February 10, 2005)... and I could not say anything, not even a squeak. Well, boil that dustmote! "Why would aliens come here?" I ask and the voices in my head speak. We are far from the galactic center of an average...