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Top Questions
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139
Why can't $ i\hbar\frac{\partial}{\partial t}$ be considered the Hamiltonian operator?
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122
Is spacetime flat inside a spherical shell?
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79
Why treat complex scalar field and its complex conjugate as two different fields?
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74
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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68
Don't understand the integral over the square of the Dirac delta function
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56
Why are Only Real Things Measurable?
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50
Is the converse of Noether's first theorem true: Every conservation law has a symmetry?
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48
Does Heisenberg's uncertainty under time evolution always grow?
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46
Do an action and its Euler-Lagrange equations have the same symmetries?
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46
Gauge covariant derivative in different books
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43
Is there something similar to Noether's theorem for discrete symmetries?
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42
Why is this translation not a linear transformation?
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40
Deriving the Lagrangian for a free particle
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39
The formal solution of the time-dependent Schrödinger equation
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39
Lagrangian and Hamiltonian EOM with dissipative force
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38
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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35
What symmetry causes the Runge-Lenz vector to be conserved?
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34
What is the connection between Poisson brackets and commutators?
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34
Why can't d'Alembert's Principle be derived from Newton's laws alone?
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33
Reason for the discreteness arising in quantum mechanics?
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33
Which transformations are canonical?
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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
Commutator with exponential $[A, \exp(B)]$
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32
Why is this translation not a linear transformation?
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32
Quantization of a particle on a spherical surface
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32
How to derive Maxwell's equations from the electromagnetic Lagrangian?
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31
Why do all fields in a QFT transform like *irreducible* representations of some group?
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31
Hilbert space of harmonic oscillator: Countable vs uncountable?
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31
Noether charge of local symmetries
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