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HNQ
3:28 AM
3
Q: Is there a Dark Matter Paradox?

timmAccording to this preprint, The Importance of Being Symmetric: Flat Rotation Curves from Exact Axisymmetric Static Vacuum Spacetimes, spiral galaxies possess flat rotation curves without assuming Dark Matter. But this is in contrast to the power spectrum of the microwave background where the seco...

 
9 hours later…
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HNQ
12:22 PM
3
Q: Does the Larmor Formula assume circular motion?

tparkerThe Wikipedia page on the Larmor formula says that the Larmor formula makes the unavoidable assumption that the charged particle is orbiting in a circle. This quoted sentence isn't true, correct? I just reread the derivation of the Larmor formula in a couple sources and never saw any assumption...

 
10 hours later…
HNQ
HNQ
10:25 PM
4
Q: When is a state entangled?

Daniel JanjaniI have read from What's the difference between an entangled state, a superposed state and a cat state? that an entangled state is one that cannot be expressed as product state. Suppose we have the following state $$ |\psi\rangle = |\alpha\rangle_1 |\beta\rangle_2 $$ which can be seen as a produc...

3
Q: Is intrinsic spin a quantum or/and a relativistic phenomenon?

SaeedOk, this is my reasoning. I am probably making some wrong assumptions here, pls tell me where I am going wrong. Spin as a quantum phenomenon: Quantum phenomena disappear as plank constant goes to zero and since the intrinsic spins are proportional to Planck constant, it is a quantum phenomenon. S...


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