Qmechanic

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I'm a theoretical physicist.


484 Answers

newest activity votes
23
Does Heisenberg's uncertainty under time evolution always grow?
16
Why $\displaystyle i\hbar\frac{\partial}{\partial t}$ can not be considered as the Hamiltonian operator?
13
Gauge covariant derivative in different books
13
Don't understand the integral over the square of the Dirac delta function
13
Is there something similar to Noether's theorem for discrete symmetries?
12
Commutator with expontential [A, exp(B)]
12
How can rising bubbles shrink and disappear?
12
Why is the Earth so fat?
11
Why one-dimensional strings, but not higher-dimensional shells/membranes?
9
Could negative dimension ever make sense?
9
Lie bracket for Lie algebra of $SO(n,m)$
9
Deriving the Lagrangian for a free particle
8
Can any rank tensor be decomposed into symmetric and anti-symmetric parts?
8
How to prove that proper orthochronous Lorentz transformations form a group?
8
Why is the second order perturbative correction to the ground state energy always down?
8
Why is the contribution of a path in Feynmans path integral formalism $\sim e^{(i/\hbar)S[x(t)]}$
7
Definition of Casimir operator and its properties
7
Do an action and its Euler-Lagrange equations have the same symmetries?
7
Why is the “canonical momentum” for the Dirac equation not defined in terms of the “gauge covariant derivative”?
7
Grassmann paradox weirdness
7
When is Lebesque integration useful over Riemann integration in physics?
7
Is the converse of Noether's first theorem true: Every conservation law has a symmetry?
7
3D Delta Potential Well
7
“Dear radioactive ladies and gentlemen” - Letter by Wolfgang Pauli
7
what this Lagrangian stands for?
7
Why is the angle of the wake of a duck constant?
7
invariance of lagrangian in Noether's theorem
7
How does non-commutativity lead to uncertainty?
6
Hilbert space of harmonic oscillator: Countable vs uncountable?
6
When can a global symmetry be gauged?
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