dmckee‭

There is no problem with the approach you suggest: it's equivalent to deciding to use seconds and light-seconds as your units for space-time four vectors instead of light-meters and meters. (I actu...

posted 5y ago by dmckee‭  ·  edited 5y ago by dmckee‭

Olin and Derek have covered the biggest part of this: the combination of energy and momentum conservation rules out the two-into-one combination of photons that are not co-linear. That might leave...

posted 1y ago by dmckee‭

The experience we had on the physics site Somewhere Else may be instructive (I've already written a little about it on Software Meta). In short, against my wishes they were allowed but because ther...

posted 4y ago by dmckee‭

Answering from the point of view of a particle physicist. Meaning we consider an event where and electron and proton approach each other in an initially free condition (not already bound). Electro...

posted 4y ago by dmckee‭  ·  edited 4y ago by dmckee‭