https://doi.org/10.1140/epjc/s10052-018-5728-x
Regular Article - Theoretical Physics
What if gravity becomes really repulsive in the future?
1
Departamento de Física, Universidade da Beira Interior, Rua Marquês D’Ávila e Bolama, 6200-001, Covilhã, Portugal
2
Centro de Matemática e Aplicações da Universidade da Beira Interior, Rua Marquês D’Ávila e Bolama, 6200-001, Covilhã, Portugal
3
Department of Theoretical Physics, University of the Basque Country UPV/EHU, P.O. Box 644, 48080, Bilbao, Spain
4
IKERBASQUE, Basque Foundation for Science, 48011, Bilbao, Spain
* e-mail: jviegas001@ikasle.ehu.eus
Received:
2
August
2017
Accepted:
10
March
2018
Published online:
24
March
2018
The current acceleration of the Universe is one of the most puzzling issues in theoretical physics nowadays. We are far from giving an answer in this letter to the question of its nature. Yet, with the observations we have at hand, we analyse the different patterns that the gravitational potential can show in the future. Surprisingly, gravity not only can get weaker in the near future, it can even become repulsive; or equivalently, the gravitational potential may become negative. We show this remark by using one of the simplest phenomenological model we can imagine for dark energy. We have also reviewed the statefinder approach of these models. For completeness, we have also showed the behaviour of the density contrast of dark matter and dark energy for these simple (yet illustrative models). Our results are displayed and we see how they shall evolve in the future.
© The Author(s), 2018
