The hypothesis that superheavy particles as particles of cold dark matter decay in our Galaxy and are observed today as ultra-high energy cosmic rays is discussed. These particles were created from vacuum by the gravitational field of the inflaton field in the Grand Unification era. Supposing that they have some quantum number of the type of strangeness conserved in strong and gravitational interactions, it is claimed that, although they were created by gravity in pairs, they decay as long-living and short-living components. The decay of the short-living component at times close to the Grand Unification era, due to baryon charge nonconservation and CP -noninvariance, produces the observable baryon charge of the Universe, while the long-living component constitutes cold dark matter, and its decay produces the ultra-high energy cosmic rays events.
We consider the possibility of the quantum vacuum states in f(R,T) gravity. Particularly, we study the Bogoliubov transformations associated to different vacuum states for some f(R,T) models. The m...
1and that these are possible sources of energies up to 100 PeV, above which extragalactic sources are believed to dominate. Even if only 10% of the supernova explosion energy (10 51 erg) goes into cosmic rays, they are energetically capable of delivering the requisite cosmic ray power of 10 42 erg/s into the interstellar medium. They may well be the only class of object within our galaxy with this capability. The acceleration mechanism of cosmic ray particles is most probably diffusive shock acceleration, which can produce the appropriate power and satisfy the requirement of a power law energy spectrum.