Semiclassical approach to the decay of protons in circular motion under   the influence of gravitational fields
  We investigate the possible decay of protons in geodesic circular motion around neutral compact objects. Weak and strong decay rates and the associated emitted powers are calculated using a semi-classical approach. Our results are discussed with respect to distinct ones in the literature, which consider the decay of accelerated protons in electromagnetic fields. A number of consistency checks are presented along the paper. 
Douglas Fregolente, George E. A. Matsas (Sao Paulo, IFT), Daniel A. T.   Vanzella (Sao Paulo U., Sao Carlos)