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PeterDonis's latest activity
PeterDonis
replied to the thread
I
Euclidean geometry and gravity
.
That's correct. Note, though, that when you have a star in the center instead of a black hole, the spacetime geometry inside the star is...
11 minutes ago
PeterDonis
replied to the thread
I
Euclidean geometry and gravity
.
First, you should say flat spacetime and curved spacetime. Those are the invariants. Second, while paper made out of the ordinary...
54 minutes ago
PeterDonis
reacted to
PAllen's post
in the thread
I
Euclidean geometry and gravity
with
Like
.
Some additional cautions may be stated: A paper so oriented is not inertial, so you have to imagine some force holding it in place...
56 minutes ago
PeterDonis
replied to the thread
I
Euclidean geometry and gravity
.
That's not what I said. What I said is that, if you're observing from a distance objects that are at rest fairly close to a black hole's...
Today, 4:55 PM
PeterDonis
replied to the thread
I
Formal derivation of statement from Peano Arithmetic system
.
Thread reopened after a post with an unacceptable reference (ChatGPT) has been deleted.
Today, 2:57 PM
PeterDonis
replied to the thread
I
Euclidean geometry and gravity
.
Not if the conditions are the same. But what someone very distant observes won't be easily interpreted as "I'm seeing non-Euclidean...
Today, 2:56 PM
PeterDonis
replied to the thread
I
Euclidean geometry and gravity
.
If the paper were oriented radially, then yes, you would be able to draw a triangle on it whose angles would not add up to 180 degrees...
Today, 2:55 PM
PeterDonis
replied to the thread
I
Euclidean geometry and gravity
.
It depends on how the paper is oriented and what its state of motion is. But for a piece of paper of ordinary size and a black hole of...
Today, 10:53 AM
PeterDonis
replied to the thread
B
What happens to information inside a blackhole
.
Yes. The coordinates don't matter; the model is the same regardless of what chart you use. The Kruskal chart is useful because it...
Today, 10:43 AM
PeterDonis
replied to the thread
B
What happens to information inside a blackhole
.
There is a mathematical model in which that's true, but it's not one that is physically realized in our universe. No, because in the...
Yesterday, 11:07 PM
PeterDonis
replied to the thread
B
The Effect of Linear and Rotational Motion on Measured Weight
.
Why would it? Tangential motion doesn't affect the normal force. The direction of the acceleration vector does, yes. But the magnitude...
Yesterday, 2:48 PM
PeterDonis
replied to the thread
I
Prof Mike Wiest's proposed link between quantum and consciousness
.
We won't know that for sure until we have a confirmed theory of quantum gravity. :wink:
Yesterday, 12:03 PM
PeterDonis
reacted to
.Scott's post
in the thread
I
Entanglement might be the result of an underlying law?
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I won't answer that question, but I will point out that if the laws of Physics were not followed, we would not be here to discuss it. In...
Yesterday, 10:41 AM
PeterDonis
replied to the thread
I
Prof Mike Wiest's proposed link between quantum and consciousness
.
I don't think the research program referred to is to use quantum gravity to explain the brain specifically. I think it is to use quantum...
Yesterday, 10:39 AM
PeterDonis
replied to the thread
I
Prof Mike Wiest's proposed link between quantum and consciousness
.
It should be noted that there are plenty of others who disagree with this point of view. One of the most notable arguments against it...
Wednesday, 9:43 PM
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