Dilation Definition and 1000 Threads

Hello, I'm working on a hypothetical situation involving a planetary body orbiting a black hole (similar to the scenario in Interstellar, but for different reasons), trying to balance tidal forces with orbital distance and time dilation. First, I'm interested in the effect of gravitational...

OK, I could probably find the answer of this simple question somewhere, but... If an astronaut stays on space station, in a weightless state, for 30 years, how much older does he/she become compared to a person who stays on the Earth all the time? I think it is about one second. Am I...

I have a question regarding time dilation within the frame work of special relativity. I'm sorry as I know that this forum is constantly receiving questions like this however I just cannot seem to find my answer. Anyways, the question is concerning the twin paradox. We know that the twin aboard...

Homework Statement I'm reading the book Relativity, Gravitation, Cosmology by Ta-Pei Cheng. I'm in the part where he derived the gravitational time dilation formula for static gravitational field, τ1=[1+(Φ1-Φ2)/c2]τ2. This implies that clocks at a higher gravitational potential will run...

Put simply, is the explanation for velocity-based time dilation toward the end of this video correct? http://www.iflscience.com/physics/teenager-wins-400000-his-video-explaining-einsteins-theory-relativity Considering he won $400k in an international science video competition, you would hope...

No matter how much I shed light on it, there's always some dark corners of relativity into which I have trouble seeing. In a recent book I read, a starship with continuous acceleration approaches c to within many decimal places, creating a collosal time dilation - enough for the universe to age...

I am a newbie to quantum physics but have been actively reading much about it for a couple weeks. However there are a few questions I simply cannot seem to find the answer to in regards to time dialation, the relationship between speed of light and time, etc. It seems like many sources repeat...

So for an outside observer it appears someone falling into is slowing down and then gets redder and redder. But what about for the local observer? From the perspective of the person falling I would imagine that the universe would appear to speed up tremendously. Is it possible you could survive...

Hi all! I've been doing some studying length contraction and time dilation and I came across this link http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/tdil.html . I completely understand what it did with length contraction but when I got to time dilation I couldn't figure out one thing. They...

In various documentaries they bring up the argument that we won't be able to visit other stars because even if we would travel with the speed of light, it would take xxx years, since the next habitable planet is xxx lightyears away. BUT: What about time dilation? If an object approaches light...

Hello. This is not a concrete problem, rather conceptual question. Homework Statement 2. Homework Equations 3. The Attempt at a Solution [/B] Spaceship with speed v with respect to the Earth is traveling from the Earth to say some distant star, which is distant L apart from the Earth looking...

Greets everyone. I am having great difficulty trying to explain to a group of friends who do not understand math too well that the unit we know as time does not speed up or slow down since 1 second is no different than marks on a ruler and has an established interval length, in this case...

A yes answer can cause conceptual problems. What is your opinion?

In the weak field limit, we have dt = (1 + 2\phi)^{-\frac{1}{2}}d\tau where the usual meaning of the symbols applies. This means that in GR dτ < dt analogous to SR. Let suppose we measure the period dtS of a photon emitted at the surface of the Sun as well as the same photon, i.e. same atomic...

For example if there were two objects orbiting each other and one was much heavier than the other, for instance a dwarf star and a neutron star. Would the lighter object have a greater gravitational pull than it's mass would say it should because it's pull was operating longer on the heavier...

Hello, I like to calculate the time dilatation at the ISCO of a Kerr black hole: According to general relativity the time dilation is given by following formula: d \tau = \sqrt{g_{\mu \nu} \dot{x^{\mu}} \dot{x^{\nu}}} If I'm interestet in the time dilation at the ISCO I set \Theta =...

Homework Statement The highest energy protons have gamma factors around ##1.0*10^{12}##. (a) Our galaxy has a disk diameter of 30 kpc, which is ##9.3*10^{20}m##. If a photon and one of these high energy protons start traversing the galaxy at the same time, by how long will the arrival of the...

Homework Statement t = t0/(1-v2/c2)1/2 Homework Equations t = 10/(1-.95c^2/c^2)1/2 The Attempt at a Solution [/B] The provided solutiojn to the example given above is: t = 10/(1- (.95c)2/c2)1/2 t = 10/(1- .952)1/2 t = 10/ .312 t = 32 Unfortunately, no matter what I do the answer I...

Homework Statement can somebody help my figure out what t0 l0 l and t is? For instance: A girl an her dad are in an airplane, the girl starts running 20m in 8 seconds. There is also a boy standing beneath the plane (lets pretend that the airplanes floor is seethrough. Homework EquationsThe...

As an astronomer observes a galaxy, which is receding, Does time dilation occur between the two comoving galaxies? If so, which (rf) is (t) longer in, as observed here on Earth (Our local Milkyway galaxy or the remote galaxy)? Thank you.

I have seen a video in which the time dilation due to velocity is explained by saying that light and light interactions inside a moving body must travel a longer distance in space, which reduces the passage of time. Video: This explanation is new to me, and in fact, I recently heard an almost...

Re. time dilation muons, CERN. Given the accelerated muons were observed to have a lifetime increased by approximately x 29, What happens to the observers life span? Thank you.

I understand that if someone is traveling away from Earth at a very high speed, time will slow down for the traveler relative to the people on earth. However, why is it not the other way around? If there is no universal reference frame, could this situation not also be thought of as the traveler...

The video is pretty popular and being spread by science channels. Is the last bit about the cause of time dilation correct? I used to think like this, but came to the concoction its wrong, but seeing this video makes me wonder once again how could this be correct. If the video is true then -...

I'm relatively new here, and was told that the GP group was a good place to ask some basic questions. If this isn't he right place for the question, please direct me to the proper group. For years I have been fascinated with the implications of the time dilation mental experiment -- the...

Hi! I've written a novel in which my main character travels through time (into the future) 18 years. While the concept of time travel is necessary to the plot, the details are not. Meaning, the book isn't sci-fi, but contains elements that wouldn't normally exist in a contemporary novel, so...

Good day, I'm a high schooler so my knowledge of physics is futile and still expanding. Please correct me when I'm wrong, I love physics. Now to my question. I'm still a bit fuzzy on this theory of time dilation and the speed of light etc. But if time dilation happens at the speed of light can...

Considering the enormous number of questions posed on this forum and other places, the concepts seem fundamentally flawed (because both are formally and practically unobservable). The calculations themselves (together with the Lorentz Transform) are highly error-prone and the results misleading...

Orodruin submitted a new PF Insights post A Geometrical View of Time Dilation and the Twin Paradox Continue reading the Original PF Insights Post.

Let’s assume it is 5,000,000 years in the future and we have created a quantum synchronization box that can broadcast a signal, used to synchronize two clocks and video feeds, no matter where they are in the universe. The third observer watches a split TV screen, which features the faces of two...

Dear all, As far as I understand, for a distant observer, time stands still at the event horizon of a black hole, right? In particular, nothing will ever pass the EH. Instead, everything that approaches the BH will get stuck at the EH and stay there forever from the perspective of the distant...

Homework Statement Five identical quintuplets leave Earth when they reach the age of 21, in the year 2121. Each quintuplet goes on a spaceship journey that takes T years, as measured by a clock in each spaceship. During the journey they travel at a constant speed v, as measured on earth, except...

Hello PF. A moving clock is seen by the platform observer to run slow. This applies to all clock constructions. A light clock runs slow because the light path lengthens and the clock takes longer to tick over. Other types of clocks don't have a light path to lengthen. By what mechanism do...

I think I have a layman's understanding of time and length contraction. However, I don't really understand gravitational time delay or distance contraction. If we were to put two clocks at the front and end of a rocket, the one on the top would experience time more quickly than would the one on...

Let me first preface this with a couple facts about me. I am not a physicist, nor have I ever taken any classes in my life to warrant any extensive knowledge on the subject. I'm a software engineer by trade but have a great interest in physics (or at the very least, spacetime and how it all...

I'm wondering if a ship orbited a black hole for a year, how large would the black hole be for it to equal 10,000 years on earth?

I was watching a Youtube video and the narrator mentioned that sometimes antimatter can be thought of matter traveling backwards in time and that confused me. I started thinking about what time is and it doesn't make any sense that antimatter acts in any way like it's traveling backwards in...

Leaving Earth at constant acceleration will make time on board go slower. Acceleration will take the ship closer and closer to c Question is: How long will acceleration act on the ship? The time as measured on Earth or on the ship? The final v will be greatly different. Of course, given enough...

Here is an oddball that I am wondering - could the spaghetification be countered by time dilation? Because as you approach a black hole (assuming you go in legs first) not only do your legs experience higher gravity than your torso, but they are also subjected to more time dilation - as they...

[Mentor's note: This thread was split off from https://www.physicsforums.com/threads/time-dilation-and-redshift-for-a-static-black-hole-comments.835277/ as clarifying misunderstandings about time in general is off-topic in a thread about the specifics of time dilation around a black hole]...

So let's say there's a train and according to the passengers on the train the trip takes a time t to go from the station and back. According to an observer at the station, would they measure a time interval of gamma *t or t/gamma? I know they both should see the others clock ticking at a...

stevebd1 submitted a new PF Insights post Time Dilation and Redshift for a Static Black Hole Continue reading the Original PF Insights Post.

I will not bother saying to much because the post will just get closed if I do not accept the forced discipline. If I shot the aeroplane out of the sky with the Keating experiment on board, destroying the atomic clock in essence stopping the beats per second of the clock, does this mean time...

The formula for time dilation in a circular orbit is readily available but the literature seems to indicate it would not be so simple in the case of an elliptical orbit, and no simple formula seems to be available. Given that time dilation in a circular orbit adds the velocity effect (GM/r) to...

Hi, I am wondering. Is it possible to predict the amount of time dilation on the surface of the sun compared to the surface of the earth? Is this a correct question to ask, or have I made a bad assumption? Thanks in advance. Ayjay

is This example correct? I made it up Twin Z get close to a black hole to observe it (theoretically he is Not in orbit, Not moving but close in off to an black hole to be affect by the gravity of it, and the black is not moving in space or rotating) And Twin X stay behind on the mothership...

If possible can someone tell me what is the formula of time dilation for an object Which theoretically is Not in orbit, Not moving but close in off to an black hole to be affect by the gravity of it. It will be greatly appreciated.

So if time dilation is what's left after correcting for the optical effect and we want to know our motion through the universe. We can't use light because we have no reference point to what not being in motion is and there's lots of attempts using light which doesn't work. Why don't we just take...

As I understand, 'Einstein's mirrored light clock' shows us that a vessel (containing said clock) traveling at any speed greater than that of a duplicate, at rest will observe a slower passage of time. I understand that this is because of simple Newtonian physics that shows us that in the case...

Hello Physics Forum. Given time runs slow as seen by a moving observer, why doesn't light travel further in the slowed time? Thereby negating the greater distance light has to travel, mirror to mirror in the light clock on the train thought experiment?