cianfa72's latest activity
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@James Hasty - here's why all attempts to measure the one way speed of light fail. This is a Minkowski diagram - it shows the position... -
And the answer would depend on your assumptions, as always. Your error is in (a) assuming that the clocks are initially synchronised...
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He defined time in a particular kind of coordinate chart (an inertial chart with orthogonal axes) that way. But that definition is...
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No it doesn't! That's the point! No, you're approximately using Rindler coordinates.
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cianfa72 replied to the thread A 1-Way Speed of Light.I'd add the qualifier coordinate speed in both SR and GR is invariant in inertial frames since the 4-velocity of light, like any...
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The two way speed of light is only guaranteed to be invariant for inertial observers. Your apparatus is not inertial. The difference...
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cianfa72 replied to the thread I Conventionality of the One-Way Speed of Light.In the above, I believe the only sensibile way to check/ensure what I highlighted in bold, is to use light beams sent forth and back...
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Worth noting that you'll get different two way speeds of light in the vertical configuration depending on which clock you use. If you...
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No, it won't. Ideally it will be 180 degrees, since A and B are on opposite sides of the wheel. No, opposite directions. No, they...
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cianfa72 reacted to PeterDonis's post in the thread I Is a Gravitational Field Real or Just a Coordinate Transformation Artifact? with
Agree.
I don't think this is a good way to put it. As most other textbooks use the term "locally flat", it means that you an always find a... -
cianfa72 reacted to Dale's post in the thread I Is a Gravitational Field Real or Just a Coordinate Transformation Artifact? with
Like.
The connection between the two is tidal gravity. Spacetime curvature cannot be removed by a coordinate transformation and tidal effects... -
cianfa72 reacted to PeterDonis's post in the thread I How do non-diagonal indices of a metric allow for local flatness? with
Informative.
Not the way you mean. The Minkowski metric is diagonal when you choose a particular coordinate chart. But you can also choose a chart on... -
cianfa72 reacted to Ibix's post in the thread I How do non-diagonal indices of a metric allow for local flatness? with Agree.
Another way to look at it is that it's always possible to pick a timelike vector and three spacelike vectors that are mutually...
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cianfa72 reacted to PeterDonis's post in the thread I Transformation for Lemaitre coordinates with Like.
This will be true in general for any transformation between the Schwarzschild chart and a chart that doesn't have a coordinate...
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cianfa72 reacted to Dale's post in the thread I Deriving Einstein's Relativity Postulates from Minkowski Spacetime with Like.
You need to say a little more than just "Minkowski spacetime metric" for it to follow naturally. The Minkowski metric is just a...