Questions tagged [time-dilation]

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Could theory of Relativity be overlooking a relationship between time and force? [closed]

Does Time dilation effect correspond to a property of the world that is suited to the term's "modulated force" or "force dilation"? It seems a simple truth. A modulation in the rate of force-driven ...
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2answers
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Gravitational time dilation with a unit of time corresponding to the period of a light wave

How is it that time runs faster at regions further out from the center of a gravitational field if: A clock's arm is made to make one cycle for a complete wavelength of a particular light beam. ...
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52 views

Dark energy time dilation

I have read here that dark energy is somewhat like negative mass. Here Wikipedia states: ... that the cosmological constant required that 'empty space takes the role of gravitating negative masses ...
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If objects slow down near a black hole, doesn't that mean the black holes won't absorb it until later? [duplicate]

First off, black holes grow (and also not die) by consuming matter, right? And if people (or any object) were to get close to a black hole, time would slow down for them which means they would ...
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2answers
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Time dilation calculation in the relativistic rocket

Rindler coordinates are useful for describing objects moving at constant acceleration: \begin{equation} \mathbf{x} = \begin{pmatrix} t \\ x \end{pmatrix} = \begin{pmatrix} \xi\sinh [\alpha \zeta] \\ \...
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Time dilation, mass-energy equivalence, and implications for the passage of time [closed]

I'm an amateur physics enthusiast, and there is a question that's been in the back of my mind for some time that I haven't been able to answer on my own. First, I want to define a couple of terms and ...
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3answers
153 views

Using time-dilation to our advantage?

Assume we have a super-computer working on an important problem, and we estimate it will take about $200$ years to solve. But, we need the answer in $20$ years. Could we ship the super-computer into ...
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0answers
38 views

Measurement of time span of a free fall into a black hole

Observations of events seen from different reference systems always confuse me: A good example is the free fall of a particle into a -- for simplicity -- non-rotating black hole. In the reference ...
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1answer
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Gravitational Time Dilation and Speed of Light [duplicate]

From what I'm understanding, the Speed of Light is roughly 186k MPS NO MATTER WHAT! Then say if a bean of light shoot pass near a Black Hole (Outside the Event Horizon of course) 1k lightyear away to ...
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29 views

Is it possible to calculate the distance between two points in space if time dilation difference is known?

If 19.4 minutes have passed on Earth and correspondingly 116.64 million years have passed on another place (Brahma loka), is it possible for me to find the distance between Earth and the other place ...
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1answer
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Time dilation in tower-clock experiment

Suppose on the earth one put a tower of height $h$, there's two clock synchronized with respect to ground observer at $t_0$. Clock $A$ put under the tower, and clock $B$ put on top of the tower. ...
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1answer
102 views

Reference frames symmetry in Special Relativity

I have a couple of questions related to reference frames in STR. Let's consider a rocket that is inertially moving towards a star with a relative velocity 0.9c. I'd like to look at this example ...
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Time dilation in general and in particular for two opposite GPS satellites

I am going throw reading on relativity and youtube explanations at the moment. So far, I got next understanding and some questions: There is time-space thing. Moving through space at the speed of ...
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1answer
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Moving clocks observed with different observers

If a clock is moving near to speed of light with constant velocity it'll slow down, but if I were to observe from the clock will the observer on Earth slow down?
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1answer
60 views

Spacetime interval calculation - What am I doing wrong?

I'm calculating spacetime intervals in standard setup with frames A and B where t = t' = 0 and x = x' = 0, and all the motion is going only in x direction. Objects A and B move in relative velocity ...
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1answer
57 views

Lorentz Transformation Perpendicular Photons

I'm trying to derive the Lorentz Transformation on my own but I'm stuck. This is probably something stupid, but I cannot figure out why I am not getting this right. enter image description here Here'...
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1answer
52 views

Are there any experimental data about potential time dilation caused by cyclical movement of heavy objects?

I am dealing with a completely fabricated scenarios (while trying to write a sci-fi book), so my thougts are completely hyphotetical. But I would like to ask you to help me find out if following ...
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1answer
45 views

Relation of time dilation with Biological clock

I have completely understood the time dilation topic along with its mathematical derivation and consequences. And we know due to time dilation a person's biological clock slows down.So I am not ...
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1answer
89 views

Variable acceleration relativistic rocket

I was wondering how a realistic fusion-or-something rocket would fly... More specifically, I wonder about the time dilation that would be experienced (say in the classic example of two twins). So, of ...
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4answers
509 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 ...
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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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1answer
47 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 $...
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1answer
64 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....
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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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1answer
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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
108 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 ...
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1answer
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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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4answers
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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
125 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
59 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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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
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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
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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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0answers
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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
48 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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2answers
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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
61 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 ...
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2answers
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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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2answers
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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
192 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 ...
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1answer
116 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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3answers
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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....