quantum639
phys545
particle488
equation458
particles394
momentum370
classical352
matrix345
electron345
operator344
equations325
physics318
vector314
operators304
spin293
theory292
exp287
function287
photon285
fig274
hamiltonian272
rev268
electrons246
probability245
cos236
atom231
energy231
functions225
density223
invariant218
photons217
symmetry214
integral208
atoms204
dirac202
scattering193
thus192
interaction191
theorem187
dimensional183
gauge181
states180
scalar178
measurement175
feynman168
coupling168
atomic167
lett164
values162
zero162
einstein160
magnetic159
linear157
lorentz152
mechanics150
radiation149
finite149
field147
properties145
matrices143
amplitude143
heisenberg142
wave139
theories138
defined131
bohr130
lagrangian129
terms129
obtain129
tensor127
invariance127
frequency125
vectors123
fields123
algebra118
vacuum117
relativistic117
therefore117
eigenvalues116
experiments115
quarks115
hence115
quark112
unitary111
interactions109
obtained109
mass109
hydrogen107
massless107
polarization107
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