All Questions
Tagged with spacetime time-dilation
251
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How to sync up different timelines and real events in general relativity? [closed]
Imagine this scenario:
Mike lives on a massive planet, so massive he experiences time going slowly.
Le petit prince lives on a small planet ( not much time dilation )
After millions of years (making ...
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2
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75
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Is it true that time dilation in a universe with no gravity could not be calculated without knowing how much mass is present in the universe?
Looking for a quick clarification on something. I am a layman and I have been trying to find out how much time dilation would exist if there was no gravity anywhere, and ignoring what seem to be ...
-3
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3
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213
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Does proper time have two different values or meanings? [closed]
I'm trying to intuitively understand proper time which is defined as the time that is always measured in a moving observer’s or particle's rest frame and is given by the equation
$\Delta\tau = \sqrt{1 ...
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2
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132
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Time dilation and contradiction
Suppose we have a reference $R$ and a reference $R'$ with velocity $v \ne 0$ respect to $R$ then we know that:
$$\Delta t = \gamma \Delta t'$$
but respect to $R'$ the reference $R$ has also velocity $...
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3
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110
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Twins paradox, Christmas photo album edition [closed]
Twin A leaves Earth in a spaceship while Twin B stays on Earth. They both agree that at the one year anniversary of their separation, according to their local clock, they will take a photo of ...
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47
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Time dilation as an observer in rocket [duplicate]
If a rocket was moving away from earth at say 0.5c, why do we consider the earth as stationary object and the rocket is moving? Can we assume that the rocket is stopped but the earth is moving ...
12
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2
answers
2k
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How do we know the assumptions of the Schwarzschild solution are valid?
The Wikipedia article on the derivation of the Schwarzschild solution (https://en.wikipedia.org/wiki/Derivation_of_the_Schwarzschild_solution) lists 4 assumptions. The second of which is:
A static ...
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112
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Understanding consequences of spacetime relativity
If I understood right, time flows slower where there is more gravitational force (or to be more precise, as it was pointed out to me, where gravitational potential is lower), compared to where there ...
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1
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109
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Does Shapiro time delay apply to massive objects? [closed]
The diagram below I have borrowed from another question about Shapiro Time Delay: Impossible dilemma about Shapiro delay and momentum conservation
My question is if Shapiro time delay applies to ...
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1
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109
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Quantum Theory and Time [closed]
I read somewhere that quantum theory requires absolute time and not a dynamic time as described in relativity. Can anyone confirm this and further describe in laymen's terms what quantum theorists ...
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4
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140
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Simultaneity of events
Apologies, this thought has been bugging me and I am... Simple
Consider two observers.
One on Earth (stationery) One travelling away from Earth at some
appreciable % of c
If the spaceship sent a ...
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33
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If a car ahead of me suddenly speeds up close to the speed of light, what would I and the car observe each of us? [closed]
Suppose I and the car is beside each other and the car went a little ahead of me, then instantly speeds up close to the speed of light. Will I observe the car is going too slow or stuck at one place ...
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1
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52
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When we use the word 'time' in spacetime and time dilation are we understanding that time has the same meaning for both entities?
When we talk about time dilation are we talking about spacetime or is time dilation a separate kind of time?
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3
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129
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Exact meaning of Lorentz transformations [closed]
This is my first year in Physics and we have been shown about S.R very superficially, just having a bunch of equations to apply. However, I feel rather confused about results such as time dilation, ...
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2
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149
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Relativity of simultaneity very confused
In the observer's frame the events A and B are simultanous ($\Delta t = 0$) and are separated by $\Delta x$
We can get the corresponding time between events in the car frame using the Lorentz ...
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