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Sep
24
asked How does Dirac conclude that $X_r(c_r)$ cannot vanish?
Sep
22
asked How does Dirac form this conjugate imaginary equation?
Sep
18
asked How is it shown that the composition of two real operators is generally not real?
Sep
2
asked How does Dirac show that $\langle B|\bar{\bar{\alpha}}|P\rangle\;=\; \overline{\langle P|{\bar{\alpha}}|B\rangle}\;=\; \langle B|{\alpha}|P\rangle$?
Aug
24
asked Is there a “forwards” and “backwards” in one dimension?
Aug
19
asked Why should multiplication of a ket vector by a complex number change only its “direction”?
Jun
12
asked Why isn't there a limit for a Euclidean rotation, as for a Minkowski rotation?
Apr
30
answered Can the equivalence principle be shown to follow from special relativity?
Mar
17
asked What experiments compete with BICEP 2, and when are their results expected?
Feb
6
answered What's the interpretation of Feynman's picture proof of Noether's Theorem?
Sep
24
asked Why does a stationary force affect the conservation of momentum, but not the conservation of energy?
Jul
8
answered Why do we still need to think of gravity as a force?
Mar
16
asked Must the Lagrangian always be known for the Euler-Lagrange equations to be of any use?
Mar
12
answered What are hidden variables exactly?
Jan
16
answered No magnetic field from a static charge - Is there a simple physical argument to show why?
Dec
20
asked Are the principles of space-time homogeneity and Isotropy independent of one another?
Oct
17
asked Can the Euler-Lagrange equations be derived from an infinitesimal Principle of Least Action?
Oct
17
asked What is meant by potential energy for a particle in a field?
Oct
3
answered Conservation of Energy in Different Frames of Reference
Sep
20
answered What's the core difference between the electric and magnetic forces?