Why do we say that elementary particles are pointlike?
131072
Why do physicists believe that particles are pointlike?
152110
How does $p\cdot u$ relate to observed energy and momentum for a massive particle?
63067
How do particles "know" when to decay?
87259
Constraints of relativistic point particle in Hamiltonian mechanics
26959
Why doesn't the uncertainty principle contradict the existence of definite-angular momentum states?
43724
What do spacelike, timelike and lightlike spacetime interval really mean?
117819
Why is first fundamental form considered intrinsic
66033
Why must fermions be antisymmetric?
157882
Why are gluons believed to be massless?
29130
Abstract Wave with Particle System
68726
Does photon have size measurement because of its particle nature
17152
Do all massless particles (e.g. photon, graviton, gluon) necessarily have the same speed $c$?
141632
Is the Higgs boson an elementary particle? If so, why does it decay?
137895
What are point objects?
111445
Why is a proton assumed to be always at the center while applying the Schrödinger equation?
150985
Why can't the Klein-Gordon equation explain the hydrogen atom but the Dirac equation does?
86302
If light rays obey to the wave equation, why can they be thought as straight lines?