960 reputation
313
bio website
location
age
visits member for 2 years, 10 months
seen Jul 28 at 15:48

Just here to learn and share.


Feb
16
accepted What is the definition of precession (in the context of Spinors)?
Feb
16
answered Some questions on observables in QM
Feb
16
asked What is the definition of precession (in the context of Spinors)?
Jan
7
answered For a theoretical (not mathematical) physicist, is there a need to learn pure mathematics?
Jan
5
awarded  Enthusiast
Jan
1
comment Where does the principle of superposition come from in newtonian mechanics?
Johnson, the linearity you are referring to is operator linearity (homomorphism + additional constraints). It does not make sense to talk about linearity of the spaces themselves. What do you mean by GR will necessitate modification of the superposition principle? Removed the -1 on Ron Miamon's comment.
Jan
1
comment Where does the principle of superposition come from in newtonian mechanics?
Ron,thanks for pointing that out. Sometimes, I miss the obvious question. :)
Jan
1
comment Where does the principle of superposition come from in newtonian mechanics?
"Why is force a vector?"- A very good question! I don't know enough group/field theory to give you an answer consistent with my previous answer. One does not have to explicitly speak of QM or CM when discussing superposition. It is a more general concept.
Dec
30
comment What does a unitary transformation mean in the context of an evolution equation?
I don't wish to argue, but the moment you say "on a normed space" are you not working with a representation?
Dec
30
answered What does a unitary transformation mean in the context of an evolution equation?
Dec
27
revised Radar Frequency Bandwidth
added 219 characters in body
Dec
27
answered Radar Frequency Bandwidth
Dec
27
comment Numerical simulation of mechanics problem
That's why I said "quick and dirty". I always ask people who are writing something for the first time to try an Euler method because it is helpful to find areas where the solution blows up. Also given that all it takes is one line of actual code, it can be useful to assist in debugging your program. The method can always be changed once decelerations etc are set correctly.
Dec
26
answered Numerical simulation of mechanics problem
Dec
24
comment How do I join two co-axial cables?
Make sure the inner core is not in contact with the outer wire mesh. Blunt any pointy mesh ends. Those things act as antennas and pick up ambient RF.
Dec
23
comment J.J. Sakurai book on Q.Mech
It is not an introductory level text. Some knowledge of Group Theory is necessary or you will be lost immediately when he starts talking about generators. Try Bohm, Messiah or Liboff instead.
Dec
22
comment What exactly is a quantum of light?
@lurscher: What does $[\hat{n},\hat{a}]$ have to do with Ron Miamon's reply? I'm not sure I understand your statement.
Dec
22
answered What exactly is a quantum of light?
Dec
20
comment Focusing laser & off-axis illumination & diffraction limit
It is possible to beat the diffraction limit. Check my answer here-->physics.stackexchange.com/questions/17881/…
Dec
20
answered Does the Pauli exclusion principle instantaneously affect distant electrons?