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Apr
3
comment Bound state of $\mu^- \mu^+$ . Why non-relativistic muon states?
@Lefteris, those k's are vectors and they are opposite to each other in the C.M. frame.
Mar
22
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Feb
4
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Jan
2
awarded  Popular Question
Oct
13
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Jun
11
awarded  Notable Question
Feb
4
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Nov
25
comment Why does the Sun always rise in the East?
@supercat, yeah you are right, very slow spin could also be a possibility.
Nov
25
comment Why does the Sun always rise in the East?
@supercat, Yeah I got that too, and that would be due to very fast orbital motion, which is not the case here.
Nov
25
comment Why does the Sun always rise in the East?
@supercat, yeah I agree with you as I have already confessed in earlier comments that if that is the way North is defined there then the sun rises in the east in those planets too.
Nov
25
revised Why does the Sun always rise in the East?
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Nov
25
answered Why does the Sun always rise in the East?
Nov
20
revised Why can we see white objects as white under the sun if the sunlight is yellow?
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Nov
20
answered Why can we see white objects as white under the sun if the sunlight is yellow?
Nov
19
comment Why can we see white objects as white under the sun if the sunlight is yellow?
you might be interested in this. See the irradiance is maximum in the visible region.
Oct
23
comment What is the meaning of spin two?
Hi you have discussed spin-0 particle as the quanta of scalar field, spin-1 particle as the quanta of vector field and spin-2 particle as the quanta of tensor field. But what about spin-1/2 particles? What do we call the field of spin-1/2 particles?
Oct
12
comment Jarlskog Invariant and its mathematical origin
@LubošMotl, The quotation in my comment is from your answer (see just below the definition of J) where you have mentioned if any of the sines or cosines of the angles is zero then the U matrix can be brought to real. But from standard parametrization, we see that if $s_{13}=0$, then only U matrix is real.
Oct
12
comment Jarlskog Invariant and its mathematical origin
@LubošMotl, Is this really true "or if any of the sines or cosines of the angles vanish in which case it's also possible to bring the matrix into a real form." ? I thought it is possible only when $s_{13}$=0. Can you give some reference ?
Sep
25
revised Why doesn't current flow when the wire is open?
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Aug
30
comment Finding the direction of the magnetic force acting on a conducting wire
The Lorentz force acting on the wire is given by $\vec{F}=q(\vec{v} \times \vec{B})$. If you don't know how to find the direction of the cross-product of the two vectors, please refer to this wiki article