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Oct
31
revised How to get the inverse of the propagator?
Corrected spelling
Oct
31
suggested approved edit on How to get the inverse of the propagator?
Oct
26
comment What does Addition of Angular Momenta tell us about Group Theory?
Yes, addition of angular momenta is a straightforward application of the so-called Clebsch-Gordan formula from group theory - case of group SU(2).
Oct
23
awarded  Citizen Patrol
Aug
26
revised Is there any difference between massless Dirac fermions and Weyl fermions?
changed unbounded to uncoupled
Aug
26
suggested approved edit on Is there any difference between massless Dirac fermions and Weyl fermions?
May
19
revised Time derivative of the state vector as expressed in abstract Hilbert space vs. as a wavefunction
Changed scalar product to norm.
May
18
suggested approved edit on Time derivative of the state vector as expressed in abstract Hilbert space vs. as a wavefunction
May
18
comment Time derivative of the state vector as expressed in abstract Hilbert space vs. as a wavefunction
I don't understand why there should be any difference, because in both cases we speak of mappings from a subset of R to basically the same Hilbert space (the abstract space and its realization as L^2 are isomorphic). The x (or p) variable is 'frozen' when discussing the partial derivative in the case of the wavefunction and is 'hidden' and also 'frozen' when the abstract space is considered...
May
18
comment solution of pendulum equation
I think you can solve that non-linear ODE through elliptic functions/integrals.
May
9
revised Is there any relationship between gauge field and spin connection?
Corrected some formulas
May
8
suggested approved edit on Is there any relationship between gauge field and spin connection?
May
6
comment Why fermions have a first order (Dirac) equation and bosons a second order one?
The natural occurence of spin (as per the analysis of Dirac 1928 and Levy Leblond 1967) stems from departing from the 2nd order differential equations of classical physics. Remember that Newton's equations are second order in time, the wave equation is second order in both time and space. We 'build' Lagrangian (densitites) to lead us to 2nd order DEs. Classical physics as a whole (apart frpm some freaky equations in linear elasticity) is built on 2nd order differential equations. The cornerstone is the probabilistic interpretation of the wave function of Born 1927.
May
4
answered What is the precise definition of state of a quantum system?
Apr
8
awarded  Critic
Mar
30
comment Hilbert space in quantum mechanics
Actually, the Hilbert space is unique in a mathematical sense: any 2 infinite-dimensional separable Hilbert spaces are isomorphic.
Feb
25
revised Representations of the Poincare group
Reformulated the first question so that it's logically connected to the second
Feb
25
suggested approved edit on Representations of the Poincare group
Feb
18
revised What's the physical intuition for symplectic structures?
'symplectic' is the proper term
Feb
18
suggested approved edit on What's the physical intuition for symplectic structures?