query: Why gluons don't have mass?
positive_passages.docid: 157882
positive_passages.text: Why are gluons believed to be massless?
negative_passages.docid: 53259
negative_passages.text: Do photons have mass?
negative_passages.docid: 80749
negative_passages.text: If Energy can be converted into mass, why can it not be converted into charge?
negative_passages.docid: 82894
negative_passages.text: Why cannot fermions have non-zero vacuum expectation value?
negative_passages.docid: 6845
negative_passages.text: What if we could give photons some mass?
negative_passages.docid: 114290
negative_passages.text: Is it possible to have a singularity with zero mass?
negative_passages.docid: 28360
negative_passages.text: Why is gravity weak at the quantum level?
negative_passages.docid: 29340
negative_passages.text: Why does no physical energy-momentum tensor exist for the gravitational field?
negative_passages.docid: 112625
negative_passages.text: Reduced mass in quantum physics (Hydrogen Atom)
negative_passages.docid: 105323
negative_passages.text: Why can't gravitons be created in traditional particle accelerators?
negative_passages.docid: 61603
negative_passages.text: Why is the Yang–Mills existence and mass gap problem so fundamental?
negative_passages.docid: 74072
negative_passages.text: No hair theorem for black holes and the baryon number
negative_passages.docid: 69983
negative_passages.text: Photon energy - momentum in matter
negative_passages.docid: 62506
negative_passages.text: Why $SU(3)$ and not $U(3)$?
negative_passages.docid: 35409
negative_passages.text: Massless charged particles
negative_passages.docid: 100098
negative_passages.text: Chemical potential of particles with zero mass
negative_passages.docid: 138818
negative_passages.text: From which dimensionful constants does proton mass arise?