All Questions
Tagged with faster-than-light reference-frames
36
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Does relative motion allow for speeds $>c$?
If motion is relative, (so if X was stationary and Y was moving at v m/s, we could think of this as Y being stationary and X moving at -v m/s), could we not create a scenario in which a stationary ...
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Preception of a beam from different reference frames [closed]
Lets say there are two spaceships A and B in the vaccum of space. There are a few scenerios that I would like to explore.
Case 1: A and B are both stationary and the distance between them is a light-...
- 179
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2
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373
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Can an object move faster than light in an accelerated frame of reference?
In an accelerated frame attached to an accelerating rocket the Lorentz contraction of the rest frame is steadily increasing, which means that distant galaxies are getting closer and closer. Does this ...
1
vote
3
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880
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Faster than light travel that does not break causality
I understand that any faster than light travel can be seen as time travel, or breaking causality, in some other reference frame.
My question is, will this always be the case for every instance of ...
- 163
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11
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Why can't we surpass the speed of light? [closed]
Can anyone provide me with a complete mathematical proof about why an observer frame cannot surpass the vacuum speed of light?
I have looked for answers in Quora and FB groups but no one is really ...
2
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1
answer
190
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Does light travel faster when it is in moving spacetime? [closed]
I was wondering if light can travel faster when it is within a region of moving spacetime. I know in general, that when you move a medium such as water, like in a river, water waves travel slower when ...
- 1,896
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2
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155
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Why is gravity fictitious?
I understand from a non-rotating falling reference frame that that gravity is fictitious since there is no apparent force acting on the falling observer. However, from a rotating frame of reference ...
- 775
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42
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Why do matter waves have superluminal phase velocites?
Specifically why do they have $V = \frac{c}{β}$ as stated in this paper written by De Broglie: http://aflb.ensmp.fr/LDB-oeuvres/De_Broglie_Kracklauer.pdf ?
I follow the proof of “phase harmony” ...
- 2,123
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100
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Apparent FTL speeds seen by observer
MY guestion is if I was in a ship orbiting a black hole (not very close to the event horizon) I am orbiting pretty far and I am experiencing that my time is slowing down realitive to people on earth. ...
- 61
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2
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584
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Why do two moving inertial frames of reference atribute the same velocity to each other?
In both relativity and Newtonian mechanics, it is a self-evident axiom according to which two inertial observers who move relative to each other measure the same velocity of, say, $v$. I want to know ...
- 2,503
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Super luminal speed paradox? [duplicate]
Chosing a reference frame in which the Earth is at rest and doesn't rotate is related, but different. Here I'm asking if there is a paradox and if my attempt at resolution has merit, and if not ...
- 2,728
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151
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Space expansion and speed of light
I recently saw a video on gravitational waves that says that expansion of space can only be measured due to changes in speed of light as everything else that could have been used to measure the ...
- 126
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1
answer
371
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How is faster than light travel analogous to time travel? [duplicate]
According to this video, faster than light travel is analogous to time travel. Does this mean that if I could instantly teleport 1 light year away, and then sent a laser pulse to my friend, my friend ...
- 845
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330
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Geocentric frame of reference and superluminal speeds
I have a couple of questions on frames of reference.
From my understanding, we can do math in an accelerating frame of reference as long as "fictitious" force terms are correctly added. From this ...
- 11
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5
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Does light travel faster if fired in the direction of Earth's rotation as opposed to against it?
Recently I entertained a silly thought about if the earth's rotation can be "harnessed" to do work. So my question is:
We know that earths rotation is eastward.
If i set up 2 mirrors on 2 different ...
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