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Mar
27
accepted Would the presence of B-modes in the CMB provide evidence for quantum gravity?
Mar
27
comment Would the presence of B-modes in the CMB provide evidence for quantum gravity?
In the context of my question, this looks like a great answer. Of course, if we see gravitational waves originating in an environment where quantum effects might be observable, that doesn't mean "the gravitational field is therefore quantized". But, since I framed the question as a scale problem, this looks to be the right answer, since the scale is appropriate for quantum effects.
Mar
27
comment Would the presence of B-modes in the CMB provide evidence for quantum gravity?
Since I asked the question, I'll just say that it's true this answer didn't directly provide explanation, but the links included in the answer do. And they are exactly relevant for the topic at hand, not the answerer's apparent dislike of inflation. In my book that's a good answer with some extraneous information, which is why I upvoted.
Mar
25
comment Would the presence of B-modes in the CMB provide evidence for quantum gravity?
...and we HAVE detected gravitational waves indirectly. Hulse and Taylor won a Nobel for it.
Mar
25
comment Would the presence of B-modes in the CMB provide evidence for quantum gravity?
Good answer with great links - Hoessenfelder's blog is always excellent. I think you get a little off-topic with the inflation comments - we don't have throw out the baby with the bathwater. I'm just curious about experimental evidence for quantum gravity, there are still great reasons for inflation.
Mar
25
revised Would the presence of B-modes in the CMB provide evidence for quantum gravity?
added something from a comment.
Mar
25
comment Would the presence of B-modes in the CMB provide evidence for quantum gravity?
@Danu: Yes, you are correct that is what I meant, and is one of the reasons I added my clarification - I don't want to worry about dust. But I'll add something more specific to the question.
Mar
25
asked Would the presence of B-modes in the CMB provide evidence for quantum gravity?
Mar
4
comment An image in movement viewed by different cameras
I believe your assessment of "a modern camera" is incorrect - the image is blurred because the aperture to the camera lens was left open for longer than the frequency of vibration. I'm not sure if it possible or not to avoid this, but that's why you see it.
Mar
4
comment The Aharonov-Bohm effect is purely classical, right?
Is it fair to say the path integral formulation of classical mechanics would be part of this "post classical formulation"? So, no quantization, but requires an unknown constant that turns out to be $\hbar$.
Feb
23
comment Derivative of a function of an operator
I guess by assumption also their derivatives do not commute. I wonder: does $[A,B]\neq 0$ imply $[A',B]\neq 0$?
Feb
23
comment Can a sufficiently large black hole be singularity-free?
Related: physics.stackexchange.com/q/24934
Feb
17
comment The Solar System explosion in the Nice model
Perhaps you could clarify why this hurts your intuition? I guess if you picture this process happening in a continuous manner, you are thinking at some point during the orbit swap, Neptune and Uranus will have a close approach. Is that it, or is there something else which doesn't seem right to you?
Feb
3
comment Is there a limitation on Gauss' law?
@Timaeus: I am arguing that Gauss's law still works - the integral of the electric field over a closed surface is the charge contained within. Since I set my problem up to sum of the charges in pairs, your argument about $+1-1...$ does not apply. Every $+1$ has a corresponding $-1$, by construction.
Feb
3
comment Is there a limitation on Gauss' law?
I have various questions about this answer, but the immediate one is "infinite sums don't exist." Taking this at its face would mean a full half of math reference books like Abramovitz and Stegin are flatly incorrect. You mean something els - like "one must be careful" or "the sum $1-1+1....$ doesn't exist".
Feb
3
revised Is there a limitation on Gauss' law?
Clarification - maybe?
Feb
3
answered Is there a limitation on Gauss' law?
Jan
26
answered What is potential energy truly?
Jan
26
answered Why does my apple not weigh 500 tons?
Jan
24
answered Locally flat coordinate and Locally inertial frame