Why massless particles have less number of possible polarisations than massive ones?
131822
Polarization vectors of massive and massless particles
17152
Do all massless particles (e.g. photon, graviton, gluon) necessarily have the same speed $c$?
100870
In De Broglie's Explanation for Bohr's Quantization Condition, why do we not use 2πr = n λ/2, why do we use 2πr = n λ?
157882
Why are gluons believed to be massless?
55992
Why is dipole the simplest source in electrodynamics?
140005
How will a particle with energy less than $V_{\rm min}$ behave?
69764
Potential inside a polarized sphere
61021
Why bosons have integer spin and fermions have half-integer ones?
57097
Massless particle in FRW metric
134962
What causes the Pauli exclusion principle (and why does spin 1/2 = fermion)?
99916
Why Do Glueballs Have Mass, When Individual Gluons Are Massless?
94442
Fundamental particles identical or just differences very small?
33978
Is the Higgs boson not responsible for most mass?
144121
What is polarisation, spin, helicity, chirality and parity?
112625
Reduced mass in quantum physics (Hydrogen Atom)
26959
Why doesn't the uncertainty principle contradict the existence of definite-angular momentum states?
147676
Quantised Angular Momentum?