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Qmechanic

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http://arXiv.org/

I'm a theoretical physicist.

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Top Questions
Top Answers
147
Why can't $ i\hbar\frac{\partial}{\partial t}$ be considered the Hamiltonian operator?
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131
Is spacetime flat inside a spherical shell?
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87
Why treat complex scalar field and its complex conjugate as two different fields?
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82
How do I construct the $SU(2)$ representation of the Lorentz Group using $SU(2)\times SU(2)\sim SO(3,1)$?
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70
Don't understand the integral over the square of the Dirac delta function
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57
Why are Only Real Things Measurable?
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52
Is the converse of Noether's first theorem true: Every conservation law has a symmetry?
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50
Does Heisenberg's uncertainty under time evolution always grow?
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49
Do an action and its Euler-Lagrange equations have the same symmetries?
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48
Gauge covariant derivative in different books
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46
Lagrangian and Hamiltonian EOM with dissipative force
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44
Why is this translation not a linear transformation?
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44
Is there something similar to Noether's theorem for discrete symmetries?
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42
Deriving the Lagrangian for a free particle
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41
The formal solution of the time-dependent Schrödinger equation
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39
Why is the contribution of a path in Feynmans path integral formalism $\sim e^{(i/\hbar)S[x(t)]}$?
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38
Why do we use Hermitian operators in QM?
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38
Commutator with exponential $[A, \exp(B)]$
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37
What symmetry causes the Runge-Lenz vector to be conserved?
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36
Reason for the discreteness arising in quantum mechanics?
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36
Why can't d'Alembert's Principle be derived from Newton's laws alone?
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35
Why/How is this Wick's theorem?
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35
What is the connection between Poisson brackets and commutators?
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35
Why the statement "there exist at least one bound state for negative/attractive potential" doesn't hold for 3D case?
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34
Noether charge of local symmetries
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33
Is there a proof from the first principle that the Lagrangian $L = T - V$?
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33
Quantization of a particle on a spherical surface
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33
Hilbert space of harmonic oscillator: Countable vs uncountable?
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33
What does the Canonical Commutation Relation (CCR) tell me about the overlap between Position and Momentum bases?
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33
Which transformations are canonical?
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