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Questions tagged [time-dilation]

This tag is for questions regarding the 'time dilation' which is the lengthening of the time interval between two events for an observer in an inertial frame that is moving with respect to the rest frame of the events (in which the events occur at the same location).

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Does Mass Actually Displace Space-Time, or does Mass only Distort it?

1. Question Given the plethora of space-time illustrations, there is a sense that space-time is actually being displaced by mass, (planets). But on its face, this doesn't really make sense because ...
elika kohen's user avatar
-4 votes
0 answers
52 views

Could Space-Time Displace or Distort Itself? [closed]

1. Question Could space-time distort and displace space-time? If space-time can interact with surrounding space-time, then which ...
elika kohen's user avatar
0 votes
2 answers
85 views

is $LT$ a Lorentz invariant?

We know the relations of time dilation and length contraction $$L=\frac{L_0}\gamma\\ T=\gamma T_0$$ If we multiply them together, we get $$LT=L_0T_0.$$ This holds for all $L$ and $T.$ So, is $LT=L'T'$ ...
user7777777's user avatar
1 vote
1 answer
74 views

Can black holes fully merge, according to a distant observer? [duplicate]

According to a distant observer, an object falling into a black hole doesn't disappear behind the even horizon but rather red-shift due to time dilation. Does the same apply to merging black holes? ...
Michael's user avatar
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2 votes
2 answers
523 views

Time dilation in Einstein's train example (lightning strike)

In Einstein's famous thought example involving a fast-moving train (say with a velocity of $c/2$), we assume that lightning strikes occur simultaneously at the front and rear end of the train as ...
user12277's user avatar
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-14 votes
1 answer
120 views

Do satellites in orbit create Relativity paradoxes? [closed]

Can someone point out the flaw in this very realistic scenario below? I will start by stating established first principles of the applicable orbital and relativistic conditions. Then I will describe ...
Anakin Skywalker's user avatar
2 votes
1 answer
76 views

How to properly combine kinetic and gravitational time dilation effect?

I developed a time dilation calculator that includes both kinetic (Lorentz Factor) and gravitational (Schwarzschild Metric Formula) factors to assess the time difference between Earth and satellites. ...
Eliot Mallamo's user avatar
8 votes
5 answers
1k views

Do you always experience the gravitational influence of other mass as you see them in your frame?

You see a galaxy far away. That galaxy is attracting you with a certain amount of gravity. I'm wondering if the gravity influence of the galaxy on you, as measured by you, always ends up being what ...
Zach's user avatar
  • 171
3 votes
2 answers
86 views

Tug of war between observers in frames with different rate of time

You have a very dense hollow sphere of matter. Observer A is inside the sphere inside a rocket. Observer B is in an identical rocket outside the sphere where the ring's gravity is negligible. They are ...
Zach's user avatar
  • 171
2 votes
1 answer
114 views

Physical meaning of $vx/c^2$ in Lorentz transformation

In Lorentz transformation, this is the formula of time dilation $$ t' = \gamma \left( t - \frac{vx}{c^2} \right) $$ It can be derivated from the formula of length contraction and be proved ...
Rojan's user avatar
  • 33
13 votes
7 answers
3k views

John, in his spaceship traveling at relativistic speed, is crossing the Milky Way in 500 years. How many supernovae explosions would he experience?

John, in his spaceship traveling at a stable relativistic speed, is crossing the Milky Way in 500 years of his own time. How many supernovae explosions would he experience? From my reference frame on ...
Alexandre Bart's user avatar
0 votes
0 answers
42 views

How can I find the distance between planet and black hole?

With the movie Interstellar how I can find time dilation of the Miller's planet? Do I need find the distance between the planet and the black hole? Then I can find the time dilation? If not, please ...
Enma isme's user avatar
0 votes
0 answers
40 views

Topological illustration of spacetime dilation: which function should I use for isometric lines spacing?

Scientific popularization, when it comes to illustrating spacetime dilation around massive objects, often relies on the description of a two-dimensional square-grid, which can be regarded as a cross-...
olivierlambert's user avatar
0 votes
2 answers
58 views

When it comes to getting closer to the Schwarzschild radius, how is discrete a limit?

From Keeton (2014) in Principles of Astrophysics: Using Gravity and Stellar Physics to Explore the Cosmos, Gravitational time dilation near a large, slowly rotating, nearly spherical body, such as the ...
olivierlambert's user avatar
0 votes
3 answers
87 views

Does time always dilate? [closed]

Consider a frame $O$ and a moving with speed $v$ relative to frame $O'$. By $(x,t)$ we denote the spacetime coordinates of a point. For two events $A, B$ happening in $O$, consider the following ...
Konstantinos Konstantinidis's user avatar
0 votes
1 answer
57 views

Time function as a function of energy (from velocity and gravity)?

Is there any formula, preferably in terms of energy, for the time dilation an object experiences taking both relativistic velocity and mass into account? I see both formulas frequently, but haven't ...
jamschreib's user avatar
0 votes
1 answer
68 views

If velocity is relative, why does time dilate for some observers and not others? [duplicate]

I'm trying to get my head around relativity and time dilation. What I can't figure out is how time can dilate for fast-moving observers if all velocity is relative. Here's a scenario: Alice and Bob ...
Justin Morgan's user avatar
0 votes
1 answer
63 views

Failures on deriving the Lorentz factor: using light clocks to calculate the dilation on space and time

I wanted to check my understanding of special relativity and set up one experiment that could lead to deriving the Lorentz factor. Usually, the deriviation for the Lorentz factor is explained using a ...
I am Einstein's user avatar
1 vote
0 answers
29 views

Moving observer detects incoming photon: Is this the full derivation of the relativistic Doppler effect?

I have a very trivial question that I can't quite work out. Imagine an observer moving in Minkowski spacetime. In Cartesian coordinates $(ct,x,y,z)$, their 4-velocity is $$u^\mu = (u^t ,u^i )$$ where $...
P. C. Spaniel's user avatar
0 votes
1 answer
79 views

Does time arising from entropy agree with GR?

There's a theory that the direction of time arises from entropy and the correlations (interactions) between bodies. However, I don't see how this would incorporate the effects of General Relativity, ...
Flamethrower's user avatar
0 votes
1 answer
99 views

Time dilation with atomic clocks near accelerators or colliders

Consider an atomic clock positioned close to a high energy particle accelerator or collider. Would the atomic clock read different values when the accelerator is operating at different "energy ...
Precious Adegbite's user avatar
2 votes
4 answers
1k views

Time Dilation when they meet

I am starting over because what I was asking was unclear. I have read many articles, such as How can time dilation be symmetric? and others suggested by people here and understand the overall concepts ...
DMacks's user avatar
  • 69
4 votes
0 answers
77 views

Relativity with three clocks [duplicate]

I saw a statement that if you have a clock on Earth and a clock on a space ship, and the spaceship moved away from Earth at a significant percentage of light speed, people on both Earth and the ...
DMacks's user avatar
  • 69
0 votes
1 answer
47 views

Time dilation cancelling out with movement in two directions

I'll preface by saying I'm fairly new to physics - was an English major back in college :-) I'm learning time dilation. As I understand it, if a rocket is travelling away and then to from Earth at ...
Hank Lyensen's user avatar
1 vote
0 answers
52 views

Is there any proposed holographic/thermodynamic interpretation of gravitational time dilation?

In AdS/CFT and holography more generally, many proposals of various degrees of plausibility have been made linking apparently physical notions on the bulk side to more information-theoretic, ...
1 vote
2 answers
86 views

Maximizing proper time with parabolic trajectory in uniform gravitational field

In Feynman Lectures, Vol II, Chapter 42, he states, "In a uniform gravitational field the trajectory with the maximum proper time for a fixed elapsed time is a parabola." How can I prove ...
sku's user avatar
  • 756
2 votes
2 answers
771 views

Is there a different way to measure speed, other than with time?

A second on Earth is different from a second on the Sun and a second next to a black hole. Therefore speed, as measured in meters per second, is different in each of these locations. Is there an ...
foolishmuse's user avatar
  • 4,783
1 vote
1 answer
106 views

Is it possible that the mass of a black hole is located at the event horizon?

Due to gravitational time dilation, an object falling into a black hole appears to slow down as it approaches the horizon, never actually reaching it. If it were to somehow enter the event horizon, ...
DexterJ Arnold's user avatar
0 votes
1 answer
83 views

Relativistic force correction factor for time-dilated continuous entities

How does gravitational time dilation affect the transmission of mechanical forces in a hypothetical scenario where a tether extends from a less gravitationally influenced region, like the edge of the ...
Travis R's user avatar
  • 229
1 vote
0 answers
30 views

For an observer on a spaceship moving near the speed of light away from Earth, would Earth be moving near the speed of light in the other direction? [duplicate]

There is something I don't understand about time relativity in examples given in internet, television, etc. Supposedly if a spaceship takes off from Earth and moves closer to the speed of light, time ...
Pablo's user avatar
  • 167
3 votes
1 answer
134 views

Time dilation and angular velocity

Is angular velocity (the horizontal rotation of a massive disc falling through the air) sensitive to time dilation or invariant to it? Will its angular velocity (speed of rotation) increase, decrease ...
Apsteronaldo's user avatar
0 votes
1 answer
139 views

What is the time dilation at escape velocity? [duplicate]

I am a newbie but as far as I understand that there are two sources of time dialations, one due to relativistic speeds and the other is due to gravitational field. If I look at these equations they do ...
eonurk's user avatar
  • 117
-3 votes
2 answers
112 views

What made Einstein to think time also dilates, along with space, with increasing gravity?

Michelson–Morley experiment showed that speed of the light remains same regardless of speed of observer. Based on it Albert Einstein came up with the proposal of time dilation for object in speed (...
user1976551's user avatar
2 votes
2 answers
135 views

Is there a location in the universe with the minimum rate of time dilation?

According to general relativity, time dilation occurs due to strong gravitational fields and high relative velocities, causing time to pass more slowly compared to observers in weaker gravitational ...
Amirhossein Rezaei's user avatar
0 votes
2 answers
69 views

To understand relativity in time with time dilation experiment

The time dilation experiment involves two frames in relative motion, let one at ground and other at train with velocity V. The light clock runs faster in rest frame, as seen by an observer A at rest ...
Raja's user avatar
  • 11
1 vote
0 answers
31 views

Gravitational Time Dilation: How to find the time difference between orbits at different radii? [closed]

I want to calculate the difference in time measured by a clock at on earths surface (r=6000km), and a geostationary satellite (r=26000km). My approach is as follows: For simplicity, we consider curves ...
John Grace's user avatar
4 votes
2 answers
628 views

GR contribution to time dilation when both clocks are falling freely

When reading simplified explanations of time dilation experienced by satellites, such as those used for the GPS and other satellite navigation systems, the time dilation is often presented as having ...
Jeppe Stig Nielsen's user avatar
3 votes
3 answers
329 views

Comparison of clocks running at different heights in a gravitational field

I hope this question has not yet been asked. If so then please link me to the answer. If I build an apparatus which, on flicking a switch, sends a light beam, a distance to a mirror, and reflects it ...
Paul Hinrichsen's user avatar
16 votes
4 answers
4k views

How long is a second on the moon?

The Office of Science and Technology Policy, part of the government of the United States of America, issued this statement outlining the need for a Lunar Standard Time (LST) standard. They state: For ...
cms's user avatar
  • 4,030
1 vote
1 answer
97 views

Variation on Twins Paradox - Simulating Gravity

There are many questions exploring variations upon the Twin Paradox, but none I have seen seem to resolve this thought experiment. It is often said that the 1g force we feel on earth due to the ...
Stev0's user avatar
  • 11
0 votes
1 answer
71 views

On the equivalence principle

In its simplest version, it states that the effects of a uniform gravitational field are indistinguishable from those of a uniform linear acceleration of the frame of reference The thing is, you can ...
ric.san's user avatar
  • 1,644
1 vote
6 answers
119 views

Question regarding time dilation

if people in semi-light-speed ships age slower, does the world appeared to those people also 'age slower'? Because it is the external world which is moving at semi-light-speed to the people in the ...
Icer's user avatar
  • 11
0 votes
0 answers
46 views

Is there a newtonian limit approximation for gravitational time dilation?

The gravitational redshift equation (for a spherically symmetric gravitational field) is: Within the Newtonian limit, there is an approximation: The gravitational time dilation equation (for a ...
HardlyCurious's user avatar
0 votes
3 answers
124 views

Relativity and variable time - there is an alternate formulation where time is always linear. Has it been studied?

Lorentz, Einstein et. al. assume time is the variable which changes in a gravity well or as speed approaches $c$. That's the commonly accepted model. For nearly 50 years I've wondered if anyone else ...
BobT's user avatar
  • 19
2 votes
1 answer
62 views

Relativistic Time Dilation and Experienced G-forces

My question is this; does time dilation, or do any other effects of relativistic-velocity travel, effect the experience of the effects of acceleration in any way? So, for instance, if an Astronaut is ...
JohnHunt's user avatar
  • 123
0 votes
0 answers
59 views

Time dilatation of a free falling observer [duplicate]

I have two questions about time dilation near a black hole. (I question) The relation $d\tau^2 = (1-\frac{r_s}{r}) dt^2$ between the proper time $d\tau$ of an observer near a B.H. and the time dt ...
Ghilele's user avatar
  • 21
-1 votes
1 answer
45 views

Calculating time dilation from a solution to the Dirac equation

Suppose I have a Muon in a potential well. Its wavefunction is a solution of the Dirac equation, a relativistic version of the Schrodinger equation for spin 1/2 particles. Because the particle is &...
Kevin Kostlan's user avatar
1 vote
1 answer
118 views

How would a spacecraft travelling near light speed say 0.9c compensate for time dilation in radio communication from spacecraft to earth?

For a spacecraft travelling at 0.9 c for 5 seconds, only 5 seconds would have passed for an observer on Aircraft, while 26.31 second would pass for a stationary observer watching from Earth. In a ...
adarshsrivastva's user avatar
0 votes
1 answer
50 views

Gravitational time dilation correct assumption?

I have seen time Gravitational time dilation experiments measured using atomic clocks on airplanes, such as the Hafele–Keating experiment. The clocks aboard the airplanes were slightly faster than ...
hammond's user avatar
  • 11
0 votes
1 answer
105 views

Time observed in a clock when you start moving relative to it

There's an example given by Brian Green, https://www.youtube.com/watch?v=XFV2feKDK9E&t=17675s To be precise the example start at 04:56:00. In brief it is as follows: There are two persons Gracie ...
Ankur's user avatar
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