2 research outputs found
Gravitational induced particle production through a nonminimal curvature–matter coupling
- Author
- Harko TiberiuDepartment of Mathematics, University College London, Gower Street, WC1E 6BT, London, UK
- Lobo Francisco S. N.(Instituto de Astrofísica e Ciências do Espaço, Faculdade de Ciências da Universidade de Lisboa, Edifício C8, Campo Grande, 1749-016, Lisbon, Portugal)
- Mimoso José P.(Instituto de Astrofísica e Ciências do Espaço, Faculdade de Ciências da Universidade de Lisboa, Edifício C8, Campo Grande, 1749-016, Lisbon, Portugal)
- Pavón Diego(Departamento de Física, Universidad Autónoma de Barcelona, 08193, Bellaterra, Barcelona, Spain)
- Publication venue
- Publication date
- 12/10/2015
- Field of study
Get PDFWe consider the possibility of a gravitationally induced particle production through the mechanism of a nonminimal curvature–matter coupling. An interesting feature of this gravitational theory is that the divergence of the energy–momentum tensor is nonzero. As a first step in our study we reformulate the model in terms of an equivalent scalar–tensor theory, with two arbitrary potentials. By using the formalism of open thermodynamic systems, we interpret the energy balance equations in this gravitational theory from a thermodynamic point of view, as describing irreversible matter creation processes. The particle number creation rates, the creation pressure, and the entropy production rates are explicitly obtained as functions of the scalar field and its potentials, as well as of the matter Lagrangian. The temperature evolution laws of the newly created particles are also obtained. The cosmological implications of the model are briefly investigated, and it is shown that the late-time cosmic acceleration may be due to particle creation processes. Furthermore, it is also shown that due to the curvature–matter coupling, during the cosmological evolution a large amount of comoving entropy is also produced
Gaia Catalogue of Nearby Stars - GCNS
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- Área de Lenguajes y Sistemas Informáticos Universidad Pablo de Olavide
- Publication venue
- Strasbourg Astronomical Data Center
- Publication date
- 01/01/2021
- Field of study
No full textVizieR online Data Catalogue associated with article published in journal Astronomy & Astrophysics with title 'Gaia Early Data Release 3: The Gaia Catalogue of Nearby Stars.' (bibcode: 2021A&A...649A...6G
