Do massless particles really exist?
76255
Does a gluon have mass or not?
14054
Do composite particles that are electrically neutral but have charged constituents radiate?
104657
Wave/particle duality
37022
Is there an elegant proof of the existence of Majorana spinors?
141320
Particle energy in general relativity?
38454
Do anti-photons exist?
90122
Is there experimental evidence that massless particles such as photons attract massive objects?
119217
If particles are points, then aren't atoms empty space?
103910
Massless string Paradox
114290
Is it possible to have a singularity with zero mass?
85582
Why aren't all photons virtual particles even in the "vacuum" of empty space?
94442
Fundamental particles identical or just differences very small?
85883
If there is no gravity, does that mean there's no mass as well?
105323
Why can't gravitons be created in traditional particle accelerators?
116355
Do singularities have a "real" as opposed to mathematical or idealized existence?
57097
Massless particle in FRW metric
149215
Does a particle annihilate only with its antiparticle? If yes, why?