4 votes

Does QFT Imply Strings the Same Way that String Theory Implies Branes?

When we take a good hard look at QFT, we don't see any particles (dimensionless points traveling on world lines). All we see are localized interactions. When we do our experiments to confirm these ...
user avatar
  • 12.4k
1 vote

Electromagnetic contribution to the mass of proton

The electromagnetic contribution to the proton-neutron mass difference is a tiny effect of $0.58 \pm 0.16$ MeV. The main contribution to $m_p-m_n$ is a QCD effect (due to the mass difference of up and ...
user avatar
  • 11

Only top scored, non community-wiki answers of a minimum length are eligible