71 reputation
324
bio website dftuz.unizar.es/~rivero/…
location Zaragoza, Spain
age 47
visits member for 3 years, 7 months
seen 1 hour ago

4h
comment Why is normal ordering a valid operation?
I think to remember that there is a conection between ordering and the discretisation (combination of forward and backward derivative) you choose in Feynmann path integral.
1d
comment Quarks as preons for the whole standard model
Hi Mitchell. As I can not see how to advance more in this topic, I am summarizing the result to send it for eventual publication in some minor journal. The draft now is in vixra at vixra.org/abs/1408.0196 and I could benefit of answers in this question doing some constructive criticism and/or proofreading of the paper.
Jul
3
comment Why do the planets' orbital distances fall on an exponential curve?
By the way, I am a bit surprised that some emergent quantisation had not been tried on this topic, at least I would expect something in the crackpot or esoteric literatures. Scale-invariant systems are not rare in quantum mechanics.
Jul
3
suggested suggested edit on Why do the planets' orbital distances fall on an exponential curve?
Jul
2
awarded  Curious
Jul
2
revised Is there some quantum potential producing exponential eigenvalues?
edited title
Jul
2
comment Is there some quantum potential producing exponential eigenvalues?
Guessing... a finite set of bound states growing exponentially could approximate some potential of "tidal" kind, $V(x) \sim 1/x^2$, couldn't it?
Jul
2
comment Is there some quantum potential producing exponential eigenvalues?
I am still worried because I can manufacture a potential with any arbitrary finite set of bound states. There is some fine convergence magic here.
Jul
2
accepted Is there some quantum potential producing exponential eigenvalues?
Jul
2
revised Is there some quantum potential producing exponential eigenvalues?
added 3 characters in body
Jul
2
asked Is there some quantum potential producing exponential eigenvalues?
May
20
awarded  Nice Answer
Nov
22
comment Can a car get better mileage driving over hills?
I am a bit surprised that a brachistochrone with friction and drag is not mentioned even as a comparative example, in any of the answers.
Nov
21
comment Can a car get better mileage driving over hills?
two towns or three towns? Is the flat road doing some curve around the hills, then?
Nov
17
comment How does the Kinect device work?
This question was about the first version of the device. Note that Kinect 2.0 uses tech from Microsoft, not the one of PrimeSense anymore. In fact, rumour is that now they are going to use Time-of-Flight
Nov
11
comment Renormalization of Composite Chiral Superfields
Yep, please elaborate
Nov
1
awarded  Yearling
Oct
20
comment Is it possible to recover the old Bohr-Sommerfeld model from the QM description of the atom by turning off some parameters?
As you are asking by Sommerfeld model too, an interesting reading is L. C. Biedenharn ''The “Sommerfeld Puzzle” revisited and resolved''
Sep
5
comment Penrose's Zig-Zag Model and Conservation of Momentum
Is it related to Feynman "checkerboard" zig-zag?
Aug
30
comment How does one show using QED that same/opposite electric charges repel/attract each other, respectively?
If Physics is about mathematical models, it does not damage to add the mathematical model in the answer.