Questions tagged [time-dilation]
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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 ...
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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 ...
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1answer
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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 ...
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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 $...
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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....
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1answer
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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 ...
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1answer
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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 ...
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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 ...
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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 ...
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3answers
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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 ...
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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^...
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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 ...
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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 ...
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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 ...
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1answer
53 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.
...
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1answer
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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?
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2answers
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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 ...
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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 ...
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144 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 ...
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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 ...
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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
...
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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 ...
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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 "$V$"......
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1answer
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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 ...
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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 ...
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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 ...
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2answers
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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 ...
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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 ...
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1answer
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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 ...
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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 ...
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2answers
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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 ...
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1answer
105 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 ...
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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....
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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 ...
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1answer
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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 ...
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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 ...
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1answer
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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?
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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 ...
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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 ...
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In what sense do photons exist?
In a photon's frame of reference travel is instantaneous, so presumably a photon cannot exist in its own frame of reference.
I am not aware that a "beam" of photons interacts via gravity despite ...
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2answers
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Is there a temporal difference between planets due to the sun's gravitational field?
since the Sun generates a gravitational field it also generates gravitational time dilatation. Hence, time further from the Sun should pass quicker than in its proximity.
Can we, therefore, say that ...
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1answer
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Journey away and back at close to the speed of light $c$
If a person drives away from a clock tower at a speed close to
$c$ for one whole day, and then drives back to it at the same speed (for another day), what would he see during each of the journeys?
I ...
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4answers
132 views
If a photon doesn't experience time, how can it have a frequency? [duplicate]
It is said that photons, moving at c, do not experience time.
But then, if a photon doesn't experience time, how can it have a frequency?
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1answer
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Inertial frames with unknown past
Let's suppose two ships that cross in space at constant speed. We do not know their previous acceleration or velocity history. When they cross, they synchronize watches.
From that moment, if they ...
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1answer
60 views
Light moving toward a moving observer's reference frame
The speed of light is supposed to be the same for all observers in an inertial frame, no matter the observer's speed. As a result, time slows down for observers moving quickly, and this explains why ...
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1answer
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Time dilation derived from first principles vs. “width contraction”
Wikipedia describes the usual derivation of time dilation with a moving light clock:
In this and similar derivations nothing is ever said about a possible "width contraction" and why it does not ...
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Calculating Time in different reference frames
Consider the following problem. A stick passes with speed v though a breadthless person whose(the stick) proper length is L. How does:
Stick See the time elapsed on my clock?
I see time elapsed on my ...
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1answer
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Time dilation inside a black hole
A clock is sent towards a black hole. My understanding is that because of time dilation, the clock will appear to tick more and more slowly to an observer on Earth, to the point where the time ...
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1answer
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If time in proximity of a big mass is dilated, the energy that “escapes” the system is dilated in time as well?
Let's suppose to have a black hole and an accretion disk. The disk will produce a certain amount of visible light, but since for a far observer time is going faster does it mean that the observer will ...
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Spacetime diagrams and their interpretation
Recently started an introductory course of relativity, and started learning about space time diagrams.
I couldn’t figure out what are the uses of a spacetime diagram as an alternative to Lorentz ...
