Questions tagged [time-dilation]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
3
votes
3answers
361 views

Queuing by the event horizon

I understand that an observer outside the event horizon (EH) of a black hole (BH) will not see anything disappearing from outside the EH - only the effects of the time dilution near the EH. Assume ...
-1
votes
0answers
27 views

What happens if we subtract all motion from a synchronized clock

If we were to take 2 synchronized clocks on earth and subtract from one of them the motion of the earth"s rotation, amd then of the earth's orbit around the sum, amd the solar system's movement ...
0
votes
1answer
45 views

Explanation of desynchronization of clocks in Special Theory of Relativity

I was going through a paper on De-Synchronization of 2 Clocks in Special Theory of Relativity. The author shows up number of ways clocks de-synchronize relative to 2 frames. The one I am stuck is due ...
1
vote
1answer
43 views

Time dilation at perceived constant acceleration

Let's say that we have a spaceship. From the beginning, the ship is stationary (relative to me) and not affected by outer forces (like Earth's or Sun's gravity). Then the ship starts to accelerate at $...
1
vote
1answer
54 views

Time dilation in black hole collisions

I understand the time dilation around a black hole to imply that when an object touches the event horizon of a black hole, the signals sent from the object will take infinite time to reach an observer....
0
votes
1answer
35 views

Measuring the speed of a relativistic particle

The time dilation principle shows that when measuring the time of a moving object, we find it bigger than the proper time. So, if we measure the time for a particle to move a certain distance and then ...
-1
votes
1answer
37 views

Messages at near-light speed

I’ve been reading up a bit on time dilation and near-light-speed travel for a personal project, and I’m having trouble wrapping my head around some of the numbers involved. Any help would be ...
0
votes
0answers
15 views

How to explain time dilation using Lorentz transformation? [duplicate]

Suppose that a frame S' is moving along X axis with velocity $v=\sqrt{3}c/2$ relative to a frame S. Now if a clock being at rest in the frame S', measures the times $t'_1$ and $t'_2$ and clock being ...
-1
votes
1answer
60 views

Are photons affected by SR time dilation (velocity) or not?

Photons are massless particles. Time dilation is caused between two observers either by the relative speed of the observers or by the observers being in different gravitational zones (stress-energy ...
0
votes
3answers
86 views

If time slows near a black hole how does someone age differently back on Earth?

I get that heavy gravitational pulls would make time differ but what I don’t get is if someone would age differently to this further away?! If I was to get a near a black hole then return to Earth how ...
0
votes
1answer
64 views

How much faster does time pass in a star orbiting a black hole compared to earth?

I want to calculate the shifting of the time in a star that orbits a supermassive black hole, i already know that if the star is orbiting at 5000 km/s with respect to earth the time will be 1/(1-(5000^...
1
vote
0answers
28 views

How to travel between two stationary worlds in the least amount of proper time?

I was intrigued by this question about minimizing the travel time between two worlds that are at rest with respect to each other, and disappointed that the answer turned out to be trivial. However, I ...
25
votes
4answers
3k views

How to travel between two stationary worlds in the least amount of time? (time dilation)

Let's imagine there are two, isolated, stationary worlds in space (called A and B), very far apart from each other. I live on World A, and some aliens live on World B. I want to learn about the ...
1
vote
2answers
124 views

How does the watch orbiting Earth “know” it has to be the slower one?

Pardon me for asking in layman's terms, but I find it the quickest. When an astrounaut's watch has orbited earth in high speed for a sufficient amount of time, it is delayed by a detectable amount of ...
2
votes
1answer
55 views

Hypothetical video feed of time dilation

As a thought experiment, I'm imagining an observer on Earth video conferencing with an observer traveling at a high velocity away from Earth, or in a very large gravitational field relative to Earth. ...
2
votes
2answers
172 views

Time Dilation Special Relativity

Let's say we have an observer named Jack on a spaceship traveling at a constant velocity of 0.95c to the right, according to Bill, who is on the Earth. Then the spaceship reaches planet A and then ...
3
votes
2answers
118 views

Is it possible to use two different metrics for one observer in distinct times (related to twin paradox)

I am not going to rewrite another twin paradox, what i am interested now is that if we assume an observer who moves with acceleration first (during $0<t<T_0$), then he stops his acceleration and ...
2
votes
1answer
27 views

Time dilation : Hourclock on Jupiter

Time slows down on Jupiter because of higher gravity, but Hourclock(sand clock) run faster due to higher g. If I am correct than how?
3
votes
1answer
176 views

Clock on a pendulum

If a clock is swinging on a pendulum (assume it's on some massive object with gravity) what happens when that system is moving at relativistic speeds? To an inertial observer, on the back-swing (i.e. ...
2
votes
2answers
198 views

Do black holes comply with the principle of unitary evolution?

Claus Kiefer, "Quantum gravity", 3rd ed., page 220/221, says in chapter 7 "Quantization of black holes": "A theory of quantum gravity should give a definite answer to the question of whether ...
0
votes
2answers
145 views

Hypothetical effect of Solar System/Orion Spur traveling near speed of light

I was hoping that some genius could explain what we would observe in the universe around us in the following hypothetical scenario in which the earth itself were traveling at or near the speed of ...
0
votes
0answers
60 views

Why is the onboard trip shorter when riding on a relativistic rocket as compared to a Newtonian rocket? [duplicate]

In the top answer for this question on the Space Exploration StackExchange, it's calculated that a rocket traveling at constant 1g of acceleration over 100,000 light years would, under Newtonian ...
0
votes
1answer
209 views

Gravitational Time Dilation and Schwarzschild Coordinates

So I'm trying to use this equation for the time dilation of an object, but I don't know how to get the distance that I have (in meters) to a radial coordinate in terms of schwarzschild coordinates. ...
0
votes
0answers
35 views

What forces are experienced when someone running near the speed of light jumps?

Suppose I am running near the speed of light, say 0.87c so that my gamma factor is exactly 2. What forces will I and the ground experience if I jump? Imagine it's a normal two-footed jump where I take ...
0
votes
1answer
64 views

Is there experimental evidence that gravity affects time itself instead of time measurement?

Atomic clocks tick differently with different gravity. That's a fact. This implies either one of the following statements: (1) Gravity affects time itself OR (2) Gravity affects time measurement only ...
0
votes
2answers
60 views

A thought experiment about time dilation

Suppose you are on am infinitely long train traveling on tracks and an atmosphere that has no resistance whatsoever. No this train is traveling at fractionally below the speed of light, and you are on ...
2
votes
1answer
51 views

Could you create a “fast forward” machine using something like an accelerating Ringworld?

If you had a large cylinder in space with people on the inside surface and you started it spinning at a constant acceleration of 1G until it was spinning at near light speed (so the tangential ...
0
votes
0answers
17 views

Special relativity different time dilatation? [duplicate]

We all know the kind of clocks being used to demonstrate the time expansion in special relativity, i took one of those and rotated it so the mirrors surfaces are orthogonal to the speed vector "$V$"......
1
vote
1answer
46 views

Which clock will dilate when one is moving towards the other [duplicate]

Suppose two children are standing 100m apart one of them starts running towards the other with relativistic speed...which clock would be slower? Note- I thought this was similar to the twins paradox ...
2
votes
1answer
221 views

What am I doing wrong while proving time dilation using Minkowski space-time diagram?

Consider two events A and C. They have same value of x' and time interval between them is $\triangle \tau$. This is the proper time interval between the events. The ...
0
votes
2answers
109 views

How are the time dilation and the relativistic Doppler shift added together in what observers “see”?

I'm using the illustration from this question: Suppose A and B are d light years away, and at rest. Then they symmetrically start to travel toward each other (symmetric acceleration process in ...
3
votes
2answers
230 views

Time dilation in quantum gravity

In General Relativity, time moves slower near massive objects where spacetime is curved stronger. In quantum gravity, the gravitational force is represented by the quantum field that refers to the ...
0
votes
2answers
199 views

How can we justify time dilation if we look through an spyglass at Einstein's light clock?

Assume that a space shuttle travels in a circular path having a radius $r_s$ at a tangential speed $v_s$ - a considerable fraction of the speed of light. There is a light clock inside the shuttle ...
0
votes
2answers
87 views

Why isn't time contraction a thing?

I'm very naive about relativity, but if it could be possible that Alice ages less than Bob in a journey, doesn't it logically follow that from the point of view of Alice, Bob has, at some point, gone ...
2
votes
2answers
58 views

If an object is travelling near light speed, would it's actions seem to be in slow motion?

Hypothetically if we were observing a clock travelling near light speed relative to us, we would see the clock ticking at a much slower speed than us. If that is true, then would all actions that are ...
1
vote
1answer
52 views

Nature of Experiment or Measurement tied to Special Relativity concepts

Premise: In special relativity, we come across concepts like Length Contraction and Time Dilation. Pertaining to these topics, I have come across the following diagram (or its slight variations) in ...
-1
votes
2answers
88 views

A beginner's question on time dilation [closed]

I have just started understanding relativity so the question might look absurd. I know that the faster we move through space , the slower we move through time. But I haven't understood it fully. I ...
4
votes
6answers
801 views

Time dilation and uniform motion

Assume a period of uniform relative motion (no acceleration) of a spaceship in reference frame, B, going 80% of light speed observed from my reference frame, A, when it passes by Earth (my references ...
0
votes
1answer
817 views

Time travel future (with calculations)

First, I have seen a few similar questions, but none involved the formulas and calculations I want to find. This is why I do not consider this as a duplicate. I know time travel to the future is ...
6
votes
1answer
152 views

Twin paradox with one twin in orbit, one in radial free-fall

Many questions on Physics SE relate to the twin paradox, but I did not find any that ask this specific question. Suppose that object A is in a circular orbit around a spherically symmetric, non-...
2
votes
1answer
106 views

What is the true cause of time dilation? Velocity, momentum or energy?

When learning about relativity, it is said that velocity (an object or a particle traveling close to the speed of light) results in time moving slower for the object moving. However, there is also ...
16
votes
7answers
7k views

According to special relativity, has the future already happened? [closed]

According to special relativity, a photon traveling at the speed of light, does not “experience” time. It is traveling into the future at an infinite rate, right? That would mean that everything that ...
1
vote
3answers
80 views

Time in our Universe versus time in Black Holes

The universe is immense and 13.8 Billion years has passed overall since it was formed in the Big Bang event. If time greatly slows down inside a Black Hole (BH), then logically very much less than 13....
0
votes
0answers
51 views

Due to TIME stopping, are contemporary Black Holes really just Large SHELLS of Matter and not Singularities? [duplicate]

If TIME slows down as you approach a Black Hole, has there been sufficient time in our Universe (13.8 Billion Years since the Big Bang occurred) for ANY matter inside the Event Horizon of ANY Black ...
1
vote
1answer
113 views

Voyager spacecrafts life span and theory of relativity

The Voyager spacecrafts are moving with an approximate constant speed of 16 to 17 km/s. As per Einstein's theory of relativity, time passes more slowly for them compared to us. Then, is it possible ...
2
votes
1answer
86 views

Why is light affected by time dilations in space-time curvatures

My previous question on this site gave me an answer to what affects light - space warping or time warping. The answer is- both. But what now doesn't make sense to me is why light is affected by time ...
1
vote
1answer
101 views

How slow can time get near a black hole?

The closer I get to a black hole, does time slow down proportionally? Does time stop near the event horizon?
5
votes
4answers
144 views

Time dilation in a gravitational field

A friend and I were talking about relativity and we had different opinions about this situation: If I choose a frame of reference on the surface of a planet, would time "run" differently between the ...
4
votes
2answers
97 views

Is light affected by space warping or time warping?

Gravity, according to the General Theory of Relativity, is simply the curvature of space-time. Objects in the universe move through space-time in geodesic paths. Also, the most interesting part is ...
0
votes
0answers
42 views

In special relativity, what will happen to miserable Schoedinger's cat?

In special relativity would the life of the Schroedinger's cat be observerd same by two observer? Two lights emit at the same time from each end of the train heading in the right direction whose ...