MG14 - Talk detail |
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Participant |
Baranov Pereira Raymundo, Iuri | |||||||
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Institution |
Institute of Physics - University of São Paulo - Rua do Matão Travessa R Nr.187 - São Paulo - São Paulo - Brazil | |||||||
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Session |
DM1 |
Accepted |
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Order |
Time |
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Talk |
Poster abstract |
Title |
Gravitationally Induced Particle Production and Relic Abundances | |||||
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Abstract |
A relativistic kinetic description for the irreversible thermodynamic process of gravitationally induced particle production is proposed in the context of an expanding Friedmann-Robertson-Walker (FRW) geometry. We show that the covariant thermodynamic treatment referred to as ``adiabatic'' particle production provoked by the cosmic time-varying gravitational field has a rigorous kinetic counterpart. The resulting non-equilibrium distribution function has the same functional form of equilibrium with the evolution laws corrected by the particle production process. The relic freeze-out process is also studied using this gravitationally induced particle production for some simple models. More precisely, a new evolution equation for cosmic relics is obtained from the extended Boltzmann equation. |
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