Decay of a Massive Particle in a Stiff Matter Dominated Universe
arXiv:1709.07236 · doi:10.1103/PhysRevD.96.105026
Abstract
In the presence of a gravitational field decay rates may significantly differ from flat space equivalent. By studying mutually interacting quantum fields the decay rates can be calculated on a given spacetime. This paper presents the calculation of the transition probability for the decay of a massive scalar particle in a stiff matter dominated universe. We find that due to the precence of a gravitational field a finite correction to the transition probability is added which depends inversely on the mass. Moreover the decay rate is smaller and lifetime of the particles is longer compared to flat space. The mass dependence is such that the lifetime of lighter particles is prolonged more compared to heavier particles. This result may be of significance when studying cosmological situations involving stiff matter.
arXiv comment6 pages, 1 figure
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- Particle physics processes in cosmology through an effective Minkowski space formulation and the limitations of the method
- Reheating in the kination epoch via multi-channel decay of gravitationally created massive scalars
- Condensate decay in a radiation dominated cosmology