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Irreversible matter creation processes through a nonminimal curvature-matter coupling

T. Harko, F. S. N. Lobo, J. P. Mimoso, D. Pavůn

An interesting cosmological history was proposed by Prigogine et al. who considered the Universe as a thermodynamically open system. This scenario is characterized by a process of matter creation, which corresponds to an irreversible energy flow from the gravitational field to the pressureless matter fluid. Here, we show that the gravitationally induced particle production may arise from a nonminimal curvature-matter coupling. By considering the equivalent scalar-tensor theory, the cosmological implications of the model are discussed. As all known natural systems tend to a state of thermodynamic equilibrium, and assuming the universe is not different in this respect, we also discuss the conditions to attain the equilibrium state.

Proceedings of the Fourteenth Marcel Grossmann Meeting
Massimo Bianchi, Robert T Jantzen, Remo Ruffini

World Scientific
2018 December

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Instituto de Astrof√≠sica e Ci√™ncias do Espa√ßo Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia