Will a Decaying Atom Feel a Friction Force?
Abstract
We show how a simple calculation leads to the surprising result that an excited twolevel atom moving through a vacuum sees a tiny friction force of first order in v /c . At first sight this seems to be in obvious contradiction to other calculations showing that the interaction with the vacuum does not change the velocity of an atom. It is even more surprising that this change in the atom's momentum turns out to be a necessary result of energy and momentum conservation in special relativity.
 Publication:

Physical Review Letters
 Pub Date:
 February 2017
 DOI:
 10.1103/PhysRevLett.118.053601
 arXiv:
 arXiv:1610.02264
 Bibcode:
 2017PhRvL.118e3601S
 Keywords:

 Quantum Physics;
 Physics  Atomic Physics
 EPrint:
 Phys. Rev. Lett. 118, 053601 (2017)