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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Would a supernova 1A appear to last longer if it were more distant and does it depend linearly on measured cosmological redshift?

Would a supernova 1A appear to last longer if seen more distant and does this depend linearly on measured cosmological redshift? I asked a question on a very popular radio station where they talked ...
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284 views

In special relativity, is the time light travels to the observer already included in time intervals?

tl;dr: A process takes time $\Delta t_B$ in some frame of reference B. Is the time an actual observer $A$ would see $\Delta t_A = \Delta t_B / \gamma$? Or is the time that the light travels to the ...
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Time dialtion when objects run in the same direction

Just trying to understand the basics. I saw some videos claiming that when you run towards light the speed of light may appear to be faster than C therefore time corrects it by being slow. Now the ...
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25 views

If cosmological redshift causes wavelength elongation does it mean the whole emitted signal is elongated?

If cosmological redshift causes wavelength elongation does it mean the whole emitted signal is elongated? Let say we have ten waves on the see hitting the shore.... If we somehow elongate every single ...
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3answers
81 views

Does a blueshift mean that time goes faster?

This is a follow-up question to this answer. The assumption in this answer is that time dilation always causes a small redshift when an observer looks at an object moving at a significant % of the ...
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3answers
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I am confused about this contradiction in special relativity?

Consider a stationary object and an object moving at half the speed of light to the right and light moving to the right past them. To observe light moving at the same speed that the stationary object ...
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2answers
124 views

Is a clock ticking at its highest possible tick rate as measured from any frame of reference at rest relative to any other clocks?

Is a clock ticking at its highest possible tick rate as measured from any frame of reference at rest relative to any other clocks? Consider 2 synchronised clocks A and B relatively stationary at the ...
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5answers
271 views

Cutting the twin paradox in half

A lot of the explanations of the Twin Paradox rely on acceleration, non-inertial frames, and/or curved/kinked world lines to break symmetry and therefore explain why the traveling twin ages less than ...
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3answers
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Is time dilation connected to particles or space around?

Is kinematic time dilation considered connected to accelerated particles or the spacetime around the particles?
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2answers
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How speed of light is absolute/constant if time (denominator) is relative?

Speed is path / time. How speed of light in vacuum can be always constant if denominator (time) is relative, its changing? If speed of light must be constant then path must be changed as well?
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283 views

What mechanism will force mechanical watch to tick slower when go fast, due to relativistic effects? [duplicate]

To make mechanical watch tick slower, watch tick rate must be changed, oscialtion of balance wheel must be SOMEHOW changed, how would speed change oscialtion of balance wheel, due to relativistic ...
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2answers
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SR time dilation in a centrifuge dilema

Picture a giant centrifuge gyrating close to the speed of light (indulge me). Person A is sitting in it close to the axis, person B further away on the radius and they are facing each other. To ...
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Age of the universe and time dialation [duplicate]

We currently believe the age of the universe is 13.8 billion years old. However because time is relative, what is this age relative to? As for e.g Light 0 seconds has elapsed.
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Is my understanding of the concept on time dilation accurate?

Warning, I have no background in Physics. I'm trying to understand time dilation in special relativity. I have found quite similar questions here and here but I would like to elaborate more and frame ...
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1answer
112 views

What is the frequency of the light seen by an observer free-falling into a black hole?

My question is similar to many others, Infalling light signals seen by a free falling observer for instance, but I have not seen it addressed exactly as I want to ask it. It is clear for me (I am ...
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4answers
189 views

Wrist watch close to a black hole

The article in the source below says, "As you get closer to a black hole, the flow of time slows down..." I am trying to understand this whole time slowing down with the following thought ...
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3answers
133 views

Time dilation: Whose clock will be slow on comparison?

Let us take an inertial frame $S^\prime$ moving w.r.t another inertial frame $S$ with a uniform velocity ${\vec V}=V\hat{x}$. Let us imagine the following situation. Let the $S$-observer and the $S^\...
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5answers
176 views

Are Einstein Light Clocks wrongly understood?

I wonder why people use examples of light clocks to explain time dilation. But in reality it violates the speed of light. My question is, if light speed in constant and absolute, why does a moving ...
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1answer
95 views

Clocks in gravitational field

"In a gravitational field clocks slow down" - this is an effect of gravitational redshift. Are the following statements correct? If I take a "clock" from the surface of the Earth ...
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4answers
143 views

Will two successively infalling observers meet at the event horizon?

Alice is radially free-falling towards a black hole. 1000 years later, Bob is following her, also free-falling. Will he meet Alice at the event horizon? The problem is that from the point of view of a ...
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1answer
87 views

Time dilation inside International Space Station

SR tell us that inside ISS time is running slower than on the earth. But velocity is relative. We can choose to consider either ISS or earth to be at rest. An observer inside ISS sees the earth ...
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Does string theory incorporate general relativity? [duplicate]

I know that it is supposedly possible to recover quantum field theory from string theory (as I understand, you get QFT when taking some limit). Is the same true for general relativity? That is, does ...
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3answers
162 views

This question is about time dilation but a bit different

See the image below- Here I have decribed a scenario related to relativity theory. A spaceship is travelling at "V" velocity relative to a man standing on planet. The Spaceship's frame is ...
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2answers
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Does time go slower as you travel in the air? [duplicate]

I would like to specify a few things before starting with my actual question : At the equator, the Earth spins at approximately $1000 \ \mathrm{mph}$ Currently, because we are on the Earth, even we ...
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Transverse Doppler Effect In Special Relativity [duplicate]

Based on the Wikipedia article for special relativity: It shows how light is red or blue shifted based on whether the observer is moving or the source is moving. I'm having a hard time understanding ...
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Does the clock tick faster when falling? [duplicate]

I just read this answer that explains that the time dilation due to the gravity and the time dilation due to velocity are the same thing. Does that mean that, if I fall from the top of a skyscraper on ...
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Does it really take an infinite time to reach a Black Hole's event Horizon? [duplicate]

Does it really take an infinite time to reach a Black Hole's event Horizon. The forumla for gravitaional time dialation is. $$t_0=t_1\sqrt{1-r_s/r}$$ So I used wolfram alpha to calculate the time that ...
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1answer
96 views

Question about time dilation and what an observer sees

This is a soft question I was discussing with a friend. Suppose a portal opens up (I know this is fiction) but for the sake of argument, let's suppose something like that happens. And the observer can ...
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1answer
78 views

If the Earth is placed between three spinning black holes, Will time on Earth slow down? Will we live longer?

Just randomly thought of placing the Earth equidistant from 3 spinning black holes. Will time on the Earth slow down? Will we age slower? Assuming that the Earth is not past the event horizon yet the ...
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1answer
58 views

Would a rapidly-rotating object experience time dilation?

Suppose you have an object that is rotating rapidly about its central axis. Let's say that the rotation is so fast that tangential velocity of the outermost part of the object is nearly relativistic. ...
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2answers
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Does any time dilation take place within an electrical conductor when electricity is flowing through it?

I am curious to know if any time dilation takes place within an electrical conductor when electricity is flowing through it. It is my understanding that an electrical current (electromagnetic waves) ...
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1answer
50 views

Would stellar engines cause their planets to experience time dilation? [duplicate]

For instance, if the stellar engine is moving the solar system at relativistic speeds, would, say, a 5,000 light year voyage be shorter for the inhabitants of a planet, or would the trip still take 5,...
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Confusion interpreting the meaning of the different terms in Lorentz transformation while deriving time dilation

Let us have the familiar Lorentz transformations, given by : $$\Delta t_{s'}=\gamma\left(\Delta t_s-\frac{v\Delta x_s}{c^2}\right)$$ $$\Delta t_{s}=\gamma\left(\Delta t_{s'}+\frac{v\Delta x_{s'}}{c^2}\...
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Is the speed of light slow down around gravitational body? [duplicate]

In gravitational lensing effect, there are two types of time delay; geometric delay, gravitational delay. gravitational time delay is not caused by "distance", and speed is "distance/...
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6answers
142 views

How is time dilated in a gravitational field?

I picture a box that contains a particle that travels back and forth at the speed of light. One round trip is a unit of time. We place this box on the surface of a large planet. The particles run ...
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1answer
45 views

Would a potentially explosive star live longer if it orbited very close to a black hole due to gravitational and relativistic time dilation?

Would a potentially explosive star live longer if it orbited very close to a black hole due to gravitational and relativistic time dilation? Should, according to the time dilation effects, nuclear ...
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44 views

What is the time-dilation at the surface of an antineutron star? (Does antimatter generate gravitons, an extension of the SM, as matter does?)

The time-dilation at the surface of a [matter] neutron star is calculated to approximately be four times slower than flat space-time, conventional quantum mechanics treats antiparticles as traveling ...
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3answers
116 views

Why would spacetime curvature cause gravity given that the value of gravitational time dilation is so small?

In this question, mpv provides the clearest explanation of the operation of gravity in his answer: The apple moving first only in the time direction (i.e. at rest in space) starts accelerating in ...
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8k views

Why does everyone say that the faster you move through space, the slower you move through time, when that's not the case?

Suppose, I'm on earth and my brother is moving away from earth at a constant speed, $v=0.8c$. Now, if 5 seconds $(t_0)$ pass for me, the amount of time that will pass for my brother according to me ...
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6answers
419 views

Time dilation formula in special relativity

I'm confused by the derivation of the expression for time dilation as well as the concept itself. I've read multiple answers, textbooks, watched lectures, and they confused me further due to ...
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3answers
736 views

Does GR explain cosmological time dilation?

There is plenty of evidence for a cosmological time dilation effect. For instance a supernova that takes 20 days to decay will appear to take 40 days to decay when observed at redshift $z=1$ (see Ned ...
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4answers
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A star is just born and starts travelling towards us at 99 percent speed of light. So how would an immortal observer observe the light from it?

An immortal observer is observing a new born star from billions of lightyears away travelling towards it at near the speed of light (99%). The star is a short living one and dies soon before reaching ...
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9answers
3k views

How does gravitational time dilation affect matter?

Einstein successfully melded together space and time into one entity called spacetime in his General relativity theory and gave us further insight into how matter affects spacetime. John Wheeler said “...
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Confusion about slowing of time

Take these two scenarios : If you might have seen Justice League, in the fight scene between Superman and other heroes take place, Flash moves at an incredibly fast speed. Since it is impossible to ...
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90 views

How can time slow down and speed up for a particle simaltaneously?

Suppose there's a kangaroo baby in its mother's pouch and there's a light bulb 300,000 km from them. If someone turns on the bulb, both kangaroos will agree that the light bulb takes 1 s to turn on ...
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2answers
68 views

Does Time Dilation apply to me when I'm outside the Hubble sphere?

Imagine that I'm at a fixed point on space outside the Hubble sphere. As the space outside the Hubble sphere expands faster than the people on Earth, I too should be moving away from you guys at the ...
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1answer
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These guys occur but why? [closed]

We all know that if we consider the assumption of Einstein that is no material object can travel faster than light to be true then two effects that are Length Contraction And Time Dilation seem to be ...
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1answer
65 views

Time dilation from inside gravity well

If I were on the planet from interstellar where 1 hour = 7 years on earth and I had a super-powerful telescope and looked back at our galaxy, would I see the earth revolving around the sun at a super-...
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43 views

Are nuclear processes inside the Sun's core affected by gravitational time dilation?

Is it right that nuclear processes inside the Sun's core could be affected by gravitational time dilation?

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