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Results tagged with special-relativity
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user 109928
The special theory of relativity describes the motion and dynamics of objects moving at significant fractions of the speed of light.
0
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A question about the relativity of simultaneity
The figure is a Minkowski diagram, where light rays always are lines with a 45 degrees slope. The diagram also shows only one space dimension. Wordlines of observers with different speeds are represen …
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4
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What is the mechanism that restricts a body from accelerating past the speed of light?
A body can always accelerate, so there is no mechanism preventing acceleration to do its thing.
Why you cannot accelerate past the speed of light is just because velocity composition is not linear.
…
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2
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Why do electrons in a current spread apart, from their point of view?
The Lorentz transformation does not model some mechanism actually increasing or decreasing distances - it is just the expression of a symmetry in the laws of physics, where there is no absolute time a …
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Is time a byproduct of mass in some sense?
"Byproduct" is certainly not the right word, but there are indeed conceptual relationships between mass and time. For one thing, mass is a form of energy, and conservation of energy is related to the …
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Is this a fundamentally relativistic phenomenon?
Here is my answer in words attempting to translate the math in the other answers.
First, the Curious Phenomenon:
If a train car reaches a sufficiently high velocity as a result of
being accele …
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2
votes
Accepted
Do objects require velocity to exist?
In GR a (non-extended) object not moving either in space nor time would just be a point in spacetime, what is called an event. That is not really an object, since it has no structure and no dynamics. …
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What shape is the Earth in special relativity theory?
Because of the relativistic phenomenon of length contraction the shape of an object depends on its velocity relatively to the observer.
If you flied on a very fast spaceship past Earth, you would not …
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2
votes
Relativity of simultaneity in special relativity
In special relativity, the 'absolute state of the universe' is the Minkowski spacetime, where events are represented as points. In this spacetime, a point is four-dimensional, and there is no specific …
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2
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A Hidden Principle in Relativity
I do not agree with the premise of the question, that is the structure of a though experiment. Here is how I would put it instead:
We present a setup as seen by an observer
We use SR or GR to derive …
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1
vote
Why does time 'change' when gravity increases?
The 'why' of things is tricky in physics. Let me give a spin to this question by considering the alternative: why would space and time be completely uncorrelated to whatever happens in time and space? …
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3
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Perception of simultaneous events
The notion of 'perceiving an event' is misleading.
Perception happens here and now, so all perception at a given time for a given observer takes place within its own single event (the observer here-an …
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1
vote
Does a Photon take longer to reach me when travelling in the "trough" of a gravitational Wave?
In multi-messenger astronomy it has experimentally be observed that gravitational waves and light originating from a far-away source (for example the 2017 neutron stars merger) are detected on Earth w …
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2
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Do relativity and frame of reference contradict each other?
How relativity works in your example:
The situation ("nature") is absolute: when describing what happens either from the perspective of a passenger or that of a bystander, we do not get the feeling th …
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1
vote
A question on negative time and Minkowski Space
why a point originating inside the cone can never be the cause of an
event outside the cone?
Because the speed of causality has an upper limit, the speed of light, which is precisely what the whole …
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1
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Understanding time dilation in layman's terms
Consider a mountain trip.
Suppose that two twins living in a wide mountain range such as the Himalayas want to hike from a town in a valley to another town, several valleys away.
One of the twin, whic …
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