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2d
comment What makes water heavier than air?
It is not only the dipole and bonding, also on the other hand HH, NN and OO have very simple, almost ideal gas, properties. But up with your answer, it is the only non-tautological one :-)
2d
answered What makes water heavier than air?
Oct
19
comment Is there supersymmetry between Dirac and Klein Gordon solutions?
@user2309840 I was thinking on something coming from QFT, and preferentially 3+1 QFT. Relativistic QM looks an acceptable answer if nobody is going to try to explain via 3+1 one-particle states, but it should still explain how the transform KG--->Dirac--->KG becomes a translation. Note that articles on "Susy QM" are usually about a different subject, pairs of potentials without really considering Spin or spacial translations.
Oct
18
comment Is there supersymmetry between Dirac and Klein Gordon solutions?
Possible references iaea.org/inis/collection/NCLCollectionStore/_Public/28/002/… sciencedirect.com/science/article/pii/0370269382906116 inspirehep.net/record/109550?ln=es
Oct
17
comment Are all conservative forces a central force?
Gravity on flat earth surface.
Oct
16
revised Is there supersymmetry between Dirac and Klein Gordon solutions?
minor format
Oct
16
asked Is there supersymmetry between Dirac and Klein Gordon solutions?
Oct
15
comment Why does a remote car key work when held to your head/body?
The skeptic answer, in the skeptics SE, is horrible :-( Armchair quoting from internet, plus standard blurb about confirmation bias. Tell about groupthinking to these guys.
Oct
15
revised Why is the contribution of a path in Feynmans path integral formalism $\sim e^{(i/\hbar)S[x(t)]}$
added 406 characters in body
Oct
14
comment How are the watt-second, the newton-meter and the joule different?
@LubošMotl what about equaling action and angular momentum? Seems the same case.
Oct
12
comment Why fermions have a first order (Dirac) equation and bosons a second order one?
It could be interesting to make a separate question for the last point, the one about susy. Of course, you have two cases: the fermion with scalar partners, and the spin 1 vector with fermion partners.
Oct
10
comment Phosphorus particle experiment
I like the question, in the sense of a facebook like :-) Still, it is a bit forum-like, invites more to discussion of particle detectors than to straight answers.
Oct
10
comment What is the meaning of “a straight line”?
Not even 5 dimensions. The embedding theorem for spaces with a pseudoriemaniann metric asks for a lot more dimensions than just the embedding of manifolds. For 3 spatial and one time dimension, I think the minimum number D of dimensions where you can grant that a geodesic of 3+1 is a straight flat line in D+1 is about ninety. And well, even this is the contrary of the affirmation of your quote.
Oct
2
revised Can the up quark still be massless?
added 99 characters in body
Sep
28
comment Could string theory be an effective theory?
+1 on the remark "I can't see of any motivation, I am just putting my finger here into your eyeball just for curiosity" :-D
Sep
28
comment The classical hydrogen atom
Following the hints of Ben and CuriousOne, divide by c and see if it is a huge frequency: 3 10^14 Hz, or 300 TeraHertz. Yum, sounds huge, but visible light is the band 400-800 Thz. So we are just ok; surely we are interested in acceleration differences, but also the electron goes slower than c.
Sep
28
comment What happens when anti-matter falls into a black hole?
related: physics.stackexchange.com/q/7290
Sep
28
comment Binding Energy of an atom
Are you asking if binding energy includes ionisatio energy of the electro one must to add to the atom?
Sep
28
revised Why are hydrogen energy levels degenerate in $\ell$ and $m$?
added 426 characters in body
Sep
28
comment Why are hydrogen energy levels degenerate in $\ell$ and $m$?
what do you refer with "among other things"?