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bhobba's latest activity
bhobba
reacted to
PeterDonis's post
in the thread
I
I want a good reference to a discussion of the meaning of "the speed of light is constant"
with
Like
.
Unfortunately, Wikipedia, as is often the case, does a poor job of describing the actual physics involved. The actual physical quantity...
Wednesday, 9:16 PM
bhobba
reacted to
PeterDonis's post
in the thread
I
I want a good reference to a discussion of the meaning of "the speed of light is constant"
with
Like
.
What does this even mean?
Wednesday, 9:16 PM
bhobba
reacted to
PeterDonis's post
in the thread
I
I want a good reference to a discussion of the meaning of "the speed of light is constant"
with
Love
.
Intervals aren't "at" points. They are between two points. If you want to consider quantities at one point, you really should be...
Wednesday, 9:15 PM
bhobba
reacted to
DrGreg's post
in the thread
I
I want a good reference to a discussion of the meaning of "the speed of light is constant"
with
Like
.
I presume bhobba means "Principle of Relativity" a.k.a. "Einstein's 1st Postulate".
May 31, 2024
bhobba
reacted to
cianfa72's post
in the thread
I
I want a good reference to a discussion of the meaning of "the speed of light is constant"
with
Like
.
Sorry, what do you mean with POR ?
May 31, 2024
bhobba
replied to the thread
I
I want a good reference to a discussion of the meaning of "the speed of light is constant"
.
These discussions are always interesting. I like the approach where an invariant speed follows from the POR in inertial frames...
May 30, 2024
bhobba
reacted to
PeterDonis's post
in the thread
I
I want a good reference to a discussion of the meaning of "the speed of light is constant"
with
Like
.
Careful. The measurement involves only one clock, so the round-trip travel time of the light is invariant. But converting that to a...
May 30, 2024
bhobba
reacted to
cianfa72's post
in the thread
I
I want a good reference to a discussion of the meaning of "the speed of light is constant"
with
Like
.
I would add that in the context of SR what is constant/invariant is the two-way speed of light along any closed path (of given length)...
May 30, 2024
bhobba
reacted to
PeterDonis's post
in the thread
I
I want a good reference to a discussion of the meaning of "the speed of light is constant"
with
Like
.
But what is invariant is the light cones, not the numerical value of ##c##. One can always find a coordinate transformation that changes...
May 30, 2024
bhobba
reacted to
Dale's post
in the thread
I
I want a good reference to a discussion of the meaning of "the speed of light is constant"
with
Like
.
The important thing about ##c## isn’t that it is constant. The important thing is that it is invariant.
May 30, 2024
bhobba
replied to the thread
I
Which theory of time is the most evidence-based?
.
The thread is shut. Here's a comparison that might help. Remember geometry from school? Points have position but no size and a line...
May 15, 2024
bhobba
reacted to
Ibix's post
in the thread
I
Which theory of time is the most evidence-based?
with
Like
.
That's really a symptom of popularisation. They can't use the maths so they can't really say what they mean, and they come up with nice...
May 15, 2024
bhobba
reacted to
Vanadium 50's post
in the thread
I
Which theory of time is the most evidence-based?
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Like
.
It sounds like you are trying to come up with a coherent description of physics by stitching together sound bites from popularizations...
May 15, 2024
bhobba
reacted to
Bosko's post
in the thread
I
Which theory of time is the most evidence-based?
with
Like
.
Space-time is a coordinate system. There are 4 numbers for each coordinate. Three for space and one for time. Some laconic answer would...
May 15, 2024
bhobba
reacted to
Dale's post
in the thread
I
Which theory of time is the most evidence-based?
with
Like
.
Spacetime is the geometry of the universe. There is no reason that geometry should be made of something. Geometry is part of both vacuum...
May 15, 2024
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