6,025 reputation
1517
bio website vladimirkalitvianski.wordpres…
location Grenoble, France
age 55
visits member for 3 years, 3 months
seen 58 mins ago

Theoretical Physicist,

A blog in Russian: http://vladimir-anski.livejournal.com/

A blog in English: http://vladimirkalitvianski.wordpress.com

Another blog in Russian: http://fishers-in-the-snow.blogspot.com


Jan
29
comment Why does a Lorentz scalar field transform as $U^{-1}(\Lambda)\phi(x)U(\Lambda) = \phi(\Lambda^{-1}x)$?
One can say that in a scalar field there is nothing to transform but the argument. The proof shows that it is transformed as expected, not differently.
Jan
29
answered Why does a Lorentz scalar field transform as $U^{-1}(\Lambda)\phi(x)U(\Lambda) = \phi(\Lambda^{-1}x)$?
Jan
29
comment Derivation of rest energy in Landau & Lifshitz
@Ruslan: Probably, one has to look at (9.4) as at a definition of the total energy for a free particle?
Jan
29
comment Derivation of rest energy in Landau & Lifshitz
It is Hamiltonian, not energy.
Jan
28
comment Derivation of rest energy in Landau & Lifshitz
Are you sure that a Lagrangian shift leads to the energy shift? What about generalized momentum and other things involved?
Jan
22
comment Gauge Invariance of the Hamiltonian of the electromagnetic field
Yes, the Hamiltonian serves for deriving equations, equations serve for obtaining solutions, solutions serve for composing observables. The latter are gauge invariant.
Jan
21
answered Gauge Invariance of the Hamiltonian of the electromagnetic field
Jan
16
awarded  Yearling
Jan
8
comment Exotic coupling
Some case of a non relativistic coupling is discussed in the section about "electronium" here arxiv.org/abs/0806.2635
Jan
6
reviewed Approve suggested edit on Does Fluctuation-exchange (FLEX) approximation including spin-orbit coupling (SOC) exist?
Dec
11
comment When it is said that the Higgs field is a scalar, do they mean Lorentz scalar?
As scalar as the electron mass?
Nov
16
comment When is energy discrete/quantized for a potential well?
Here you presuppose a standing wave ;-) An evolving wave does not have to have such matching conditions.
Nov
16
comment When is energy discrete/quantized for a potential well?
No, it "proves" that the spectrum may be discrete - a standing wave needs a special coincidence of interference conditions. Otherwise it is not standing, but evolving (which is also possible to create).
Nov
16
comment When is energy discrete/quantized for a potential well?
Right, we can send two waves from two infinities from the opposite sides and get a standing wave with any energy $E$. But in a well it is the well walls who send waves back and they interfere.
Nov
16
answered When is energy discrete/quantized for a potential well?
Nov
6
revised Calculating back-reaction forces for an ensemble of slowly moving, classical charges
added 15 characters in body
Nov
6
comment Calculating back-reaction forces for an ensemble of slowly moving, classical charges
@KevinKostlan: I added a reference to a textbook.
Nov
6
revised Calculating back-reaction forces for an ensemble of slowly moving, classical charges
added 177 characters in body
Nov
6
revised Calculating back-reaction forces for an ensemble of slowly moving, classical charges
added 30 characters in body
Nov
6
answered Calculating back-reaction forces for an ensemble of slowly moving, classical charges