Questions tagged [time-dilation]

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How do you get time dilation from $g_{00}$ in general and from the Schwarzchild metric in particular?

1.Why is the observer at the bottom measuring the proper time rather than the coordinate time? 2.How do we go from time dilation to $g_{00}$ or from $g_{00}$ to time dilation? I'm trying to understand ...
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Have we observed time dilation on quickly-vibrating or very hot objects?

The common sci-fi example of time dilation would involve a futuristic spacecraft going on a one-year mission, returning to Earth 100 years later. We can imagine this happening on a smaller scale, too. ...
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Are black holes exploding just like the singularity at the big bang did, we just can't see it because of time dilation?

There is only a few question about exploding black holes but that does not address my question. Can a black hole explode? Is there a relationship between Black Holes and the Big Bang? Did the Big Bang ...
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The one-way of speed of light [closed]

My friend has a proposal to find the one-way speed of light. Synchronize two local clocks 'A' and 'B' and then move B to one kilometre apart. But because of time dilation we know B would get dilated ...
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Special relativity with horizontal mirror clock? [duplicate]

Every explanation video about special relativity comes with a constantly moving train and a vertical (according to the train's speed direction) mirror clock. So first of all, why in the classical ...
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Special Relativity: Time Dilation Thought Experiment

Setup Stationary Observer S Observer A, moving only in x-direction with the velocity v (comparable to c) wrt to S Observer B, moving with the velocity -v wrt to S Both A and B have a camera and a time-...
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Twin Paradox Explanation via Spacetime diagrams [duplicate]

Can someone explain to me the twin paradox with the help of spacetime diagrams? (No algebra and calculus)
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2answers
70 views

Why should time slow down for light?

So I just learnt about relativity and time dilation. One of the visualisations used to explain time dilation is an apparatus contaning a beam of light moving between two mirrors. When the apparatus is ...
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1answer
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Length contraction, time dilation, and spacetime intervals contradiction

I'm learning about spacetime and relativity in class. Default units are seconds and $c$. I'm using the length contraction calculator and time dilation calculator here: https://www.omnicalculator.com/...
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How are different parts of an extremely fast spinning disk affected by time dilation? [duplicate]

Especially the outer edges will have an extremely high relative velocity from the perspective of an external observer. In the Twin Paradox, two objects age differently due to different reference ...
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2answers
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Time Slows Down or Speeds Up for the Traveler According to Special Relativity? [duplicate]

Einstein's 1905 postulates entail that, if two clocks are in relative motion, either clock is slow as judged from the other clock's system (SYMMETRIC time dilation). An obvious implication is: Time ...
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How fast can an object be made to vibrate?

Can an object (or system) be made to vibrate so fast, that the vibrational transit speed approaches the speed of light therefor slowing time down significantly for the object or system relative to ...
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Asymmetric Time Dilation: Why Do They Teach It?

Brian Greene: The moving clock is slow, the stationary one is fast: https://youtu.be/Q1y3YnPgaY4?t=1157 This is obviously non sequitur in special relativity (Einstein's 1905 postulates do not entail ...
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Does time expand?

If the time component of spacetime does not "expand" in the sense that space expands, doesn't that imply that time must already exist in its entirety, past and future? I believe I have seen ...
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Testing whether the speed of light is inconsistent towards different directions [duplicate]

https://www.youtube.com/watch?v=pTn6Ewhb27k In this video of veritasium, the challenges of measuring the one-way speed of light is discussed and suggests the possibility of the speed of light being ...
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Does someone falling into a black hole see the outside universe moving faster?

Similar questions have been asked twice before, and gotten two completely different answers: Time dilation when falling into black hole - Answer is a definitive 'no' Does someone falling into a black ...
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How would a motionless person/object with no gravitational forces acting upon them experience time relative to a person on earth?

Regarding time dilation, how slowly would a theoretically completely stationary person experience time in comparison to those on earth, with that person being infinitely far away from any other object ...
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Gravitation time delay

Einstein showed us that our reality is very different from what we perceive, he taught that time under the influence of matter passes slowly. When I got to know this fact and tried to find a ...
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1answer
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How can time dilation make two photons move at the speed of light? [closed]

So I'm goin down the highway at 25mph and there's a photon moving the same direction I am (ridden by Klaus) and a photon moving the opposite direction (ridden by Steff). I know Klaus and Steff have to ...
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Entanglement and the relativity of simultaneity: an experiment [duplicate]

Setting of the experiment: Triplets Alice, Bob, and Carla have plenty of entangled electrons when they depart from Earth. Alice stays behind, Bob goes to Zeta Reticuli, and Carla goes to Andromeda. ...
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Twin Paradox and experience of speed

I'm sure someone has thought and discussed this before - I just can't seem to find any answers. Maybe the answer is so simple no one bothers to write it anywhere... The classical twin paradox: Person ...
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4answers
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Is there any way to create the distinction between time slowing down and clocks slowing down?

As Einstein once said, "Time is what you measure with a clock". So my question is: is there any way to create the distinction between time slowing down and clocks slowing down because of ...
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1answer
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Time dilation between perihelion and aphelion of earth with the combined effects of Special Relativity and General Relativity

I am a high school student and a total newbie in the field so I apologize for any misconceptions or mistakes I may do in advance. I am trying to calculate the time dilation observed on earth at it's ...
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Does time slow down due to relativistic mass increasing?

I once heard of how the existence of time dilation means relativistic mass must increase to conserve momentum but wouldn't it make more sense that something moving relative to something else leads to ...
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1answer
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Gravitational Time Dilation’s Effect on Two Observers Observing Each Other’s Time

Before reading any further, I want to warn everyone that I have absolutely no formal (nor much informal) exposure to physics outside of the small amount I got during a calculus course I took in ...
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What do you think of the idea of measuring macroscopic Special Relativistic-kinematic time dilation by placing atomic clocks onto moving dollies?

We first attempt to synchronize two stationary clocks placed apart, and we assume we succeed using the Einstein synchronization convention. Then, we run a third clock along a dolly at a constant speed....
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Special relativity - 2 astronauts syncronize their clocks and moves in different paths at different velocities, which clocks is left behind? and why? [closed]

i have the following problem and I'm not understanding if my strategy to solve it is correct: Two astronauts synchronize their clocks starting at time zero from the origin $O$ of an inertial reference ...
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'Two neutrons as twins' paradox

Is this confusing for other people? Let pressume we can extract two neutrons from their atoms and do an experiment. At time t0 we leave one of them standing still and the other one circulate inside a ...
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3answers
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Will this spaceship collide with the star? (time dilation)

I thought of the above thought experiment and arrive on 2 conflicting conclusions. I can't seem to identify the flaw in my reasoning. Suppose there is a star 4 light years from earth that has will ...
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1answer
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Is Sergei Krikalev living slightly in the future, or is his body just younger than it otherwise would have been? [closed]

Due to cosmonaut Sergei Krikalev's time on board space station Mir in Earth orbit, the combined effects of velocity and gravity have caused him to experience an accumulated 20 milliseconds of time ...
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Is proper time equal to the Invariant Interval or the time elapsed in the Rest Frame?

In SR consider two time like separated events - In some frame \begin{equation}ds^2= dt^2 - dx^2\end{equation} In a frame where the events occur at the same place ( rest frame; $dx' =0$) then according ...
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1answer
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Gravitational Time Dilation Paradox?

I can't get this around my head it seem a paradox to me. In my thought experiment. Suppose there are two guys John and Jack. John start throwing a ball at near speed of light Meanwhile Jack stays very ...
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2answers
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Understanding proper-time as “evenly spaced gradations” on the worldline?

In this video series on relativity, proper-time is explained as "evenly spaced gradations" along a particle's worldline. Here is a screenshot: Suppose I carry a clock with me that ticks at ...
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1answer
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Relativity of simultaneity & time dilation for the purposes of nonsense [closed]

I'm a fiction writer who's tinkering around with a sci-fi project and trying to dial in how "hard" it's going to be, on a sliding scale between Clark and Kessel-run-in-parsecs. To that end I'...
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3answers
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Given time dilation from traveling near light speed, would a spacecraft be able to reach any arbitrary distance including to another galaxy? [duplicate]

Not much more than in the title except that when I took an astronomy class the professor said, Andromeda is 2 million lightyears away so it is safe to say humans will never reach there. But with time ...
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1answer
45 views

Time dilation between objects with information exchange

In the example of two objects moving towards each other say at $0.5*c$ starting with synchronized clocks (edit: say synchronized by a third frame, like earth). it is understandable that each object ...
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2answers
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How do I deal with the radius-coordinate of the schwarzschild-metric in this numerical problem?

It is well known that if a black hole fulfills certain conditions, it's tidal forces will rip incoming objects apart even before they cross the event horizon. So at some point, the curvature of space ...
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1answer
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Computing in Kruskal coordinates

In my last question I learned that movement inside event horizon is actually well defined when represented in Kruskal coordinates. However, I still don't understand how it is working out. Can you help ...
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Confusion Around Relativity and Observed Clocks

I know similar questions have been asked, but I've had trouble finding an answer I understand as this is all pretty new to me. I'm trying to get a better understanding of the Special Relativity, with ...
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3answers
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Is there a force that a body experiences as it approaches light speed?

My question can be boiled down to a thought experiment. Assume you have a space ship in an empty universe. This space ship is capable of a constant $1 m/s^2$ acceleration. As it approaches light ...
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Does Coordinate time make sense in a universe with wormholes?

Let us say that you have a spacetime with wormholes, and a coordinate system. The two ends are created at almost the same point in spacetime. Then the one end is taken far away and time dilated; (note:...
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Does time dilation really have to exist?

(This is an offshoot of another question I asked regarding orientation of light clocks) Imagine we're back before the light clock example was invented and before time dilation was mentioned as a ...
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How is force transmitted through a gravitational well via matter in GR?

Lets say we have a hollow spherical shell of mass with a small hole in it. Inside the shell, the gravitation time dilation makes time pass $t_d$ times as fast as time passes infinitely far away. There ...
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2answers
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Effect of gravitational time dilation on chemical reaction kinetics

Suppose we have two identical barrels filled with water in which a specific amount of a chemical is dissolved. We add an enzyme (that slowly degrades that chemical with a constant rate (i.e. first ...
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Time dilation due to acceleration - four simple situations to try to clarify

I see some relatively comprehensive answers here but then I listen to this Don Lincoln presentation on the twin paradox which seems to be saying that the resolution to the paradox is more ...
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1answer
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How much time does a moving observer measure me measuring?

suppose I and a friend are moving relative to each other at 87% the speed of light. My friend has a large pendulum with a time period of 10 seconds. Since the pendulum is moving relative to me too, ...
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1answer
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Relativistic time dilation with vectors (any velocity direction) and seeming contradiction

I've studied the existing derivation for relativistic time dilation, namely the light clock example that results in the following well-known equation: $$ \Delta t = \Delta t_0\frac{1}{\sqrt{1-\frac{u^...
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2answers
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$t'$ in time dilation formula

in the time dilation formula, I know that $t$ is the time measured by the stationary observer between 2 events. However, is $t'$: the time measured by the moving observer on his own clock between ...
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Do I have the correct idea of time dilation?

Suppose that I send my twin away from the earth at 87% the speed of light. From the time dilation equation, since the twin is moving, the time interval between any 2 events, as measured by me, would ...
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1answer
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Does an extreme electric/magnetic field dilate time rates for a charged/magnetized clock?

I want to know if general relativity (or any defined metric in general relativity) predicts any change for the clock rates in the electromagnetic fields (potentials) for some charged or magnetic ...

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