On the possibility of non-geodesic motion of massless spinning tops

Cristóbal Armaza, Sergio A. Hojman, Benjamin Koch, Nicolás Zalaquett

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


The motion of spinning massless particles in gravitationally curved backgrounds is revisited by considering new types of constraints. Those constraints guarantee zero mass (PμPμ=0) and they allow for the possibility of trajectories which are not simply null geodesics. To exemplify this previously unknown possibility, the equations of motion are solved for radial motion in Schwarzschild background. It is found that the particle experiences a spin-induced energy shift, which is proportional to the Hawking temperature of the black hole background.

Original languageEnglish
Article number145011
JournalClassical and Quantum Gravity
Issue number14
StatePublished - 23 Jun 2016


  • curved spacetime
  • massless
  • spin
  • trajectory


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