12,213 reputation
21233
bio website
location
age
visits member for 3 years, 5 months
seen 5 hours ago

Aug
13
answered First class and second class constraints
Aug
12
answered Why do some anomalies (only) lead to inconsistent quantum field theories
Aug
2
comment Classical and quantum anomalies
Actually, I have a little more information on this subject. I'll try to add an update when I can
Aug
2
comment Classical and quantum anomalies
(cont.) webcache.googleusercontent.com/…
Aug
2
comment Classical and quantum anomalies
(cont.) But, if one uses the Sugawara construction for the Virasoro generators from the current generators, the Virasoro central charge (in the Poisson brackets) will be zero. However, in the Liouville theory one already obtains a nonvanishing Virasoro central charge in the Poisson brackets, please see the following article by Toppan:
Aug
2
comment Classical and quantum anomalies
Here are some examples referring to both your questions. In the WZNW model in two dimensions, one gets the Kac-Moody algebra at the classical level (Poisson brackets) with the correct central charge. In fact this computation was performed by Witten in his original article: projecteuclid.org/…. For a more clear derivation please see: citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.148.8249
Aug
1
revised Bohr model with all Quantum numbers for hydrogen atom
deleted 1 characters in body
Aug
1
revised Bohr model with all Quantum numbers for hydrogen atom
deleted 2 characters in body
Aug
1
comment Classical and quantum anomalies
I have added an update with the elaboration of the spin case
Aug
1
revised Classical and quantum anomalies
added 3221 characters in body
Aug
1
answered Bohr model with all Quantum numbers for hydrogen atom
Jul
31
comment Classical and quantum anomalies
When the representation on the wave functions is a ray representation,it is an indication of an anomaly, because the symmetry group is not represented faithfully. Of course group extensions can be studied in general separately from quantum mechanics. I'll update my answer tomorrow and add a few more references.
Jul
31
answered Classical and quantum anomalies
Jul
31
comment Gauge fixing choice for the gauge field $A_0$
(cont.), please see the following review by: ANTTI SALMELA ethesis.helsinki.fi/julkaisut/mat/fysik/vk/salmela/gausssla.pdf
Jul
31
comment Gauge fixing choice for the gauge field $A_0$
But if one subtitutes $A_0 = 0$ in the Lagrangian before the computation of the equations of motion, then equation of motion of $A_0$, namely, the Gauss law will be lost, because one will not have an $A_0$ in the Lagrangian to take a variation with respect to it. In this case one has to impose the Gauss law "by hand".
Jul
31
awarded  quantum-mechanics
Jul
30
answered Gauge fixing choice for the gauge field $A_0$
Jul
30
answered Do rotating bodies emit gravitational waves?
Jul
29
answered What is a completely positive map *physically*?
Jul
27
answered Symplectic integrators of the pendulum equation?