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Bouncing cosmologies: the ekpyrotic universe

Grant number: 13/03798-3
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): June 01, 2013
Effective date (End): May 31, 2017
Field of knowledge:Physical Sciences and Mathematics - Physics - General Physics
Principal Investigator:Alberto Vazquez Saa
Grantee:Juliano César Silva Neves
Home Institution: Instituto de Matemática, Estatística e Computação Científica (IMECC). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Associated research grant:13/09357-9 - Physics and geometry of spacetime, AP.TEM


Bouncing cosmologies are a possible solution for the initial singularity problem. The latter is an open issue in the standard inflationary cosmology. Among the several scenarios with a bounce, we intend to study models with a non-minimally coupled scalar field, models of modified gravity f(R) and, mainly, the ekpyrotic universe. The ekpyrotic cosmology has a slowly contracting phase which allow to solve two important problems solved by the inflation: the flatness and homogeneity. Moreover, the new ekpyrotic cosmology has a smooth transition - the bounce - between the contracting and expansion phases avoiding the initial singularity. Another important characteristic in this cosmology beyond the standard cosmology is to provide adiabatic primordial fluctuations in accordance with the cosmic microwave background radiation and a relevant non-Gaussianity in second order perturbations which may be detected in the Planck telescope. An extension of the ekpyrotic model is the cyclic cosmology: a daring attempt to know all the universe history. This project proposes to investigate these bouncing cosmologies, its problems and forecasts. (AU)

News published in Agência FAPESP Newsletter about the scholarship:
Before the Big Bang 

Scientific publications (7)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
NEVES, J. C. S. Bouncing cosmology inspired by regular black holes. GENERAL RELATIVITY AND GRAVITATION, v. 49, n. 9 SEP 2017. Web of Science Citations: 2.
NEVES, J. C. S. Einstein contra Aristotle: The sound from the heavens. PHYSICS ESSAYS, v. 30, n. 3, p. 279-280, SEP 2017. Web of Science Citations: 1.
NEVES, J. C. S. Deforming regular black holes. International Journal of Modern Physics A, v. 32, n. 18 JUN 30 2017. Web of Science Citations: 4.
JULIANO NEVES. Relatividade bem comportada: buracos negros regulares. Revista Brasileira de Ensino de Física, v. 39, n. 3 2017.
NEVES, J. C. S. Are black holes in an ekpyrotic phase possible?. ASTROPHYSICS AND SPACE SCIENCE, v. 361, n. 9 SEP 2016. Web of Science Citations: 2.
NEVES, J. C. S. Note on regular black holes in a brane world. Physical Review D, v. 92, n. 8 OCT 6 2015. Web of Science Citations: 9.
NEVES, J. C. S.; SAA, ALBERTO. Regular rotating black holes and the weak energy condition. Physics Letters B, v. 734, p. 44-48, JUN 27 2014. Web of Science Citations: 42.

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