Emergence of anti-F(R) gravity in type-IV bouncing cosmology as due to M0-brane
- Authors: Sepehri A.1, Pincak R.2,3, Pradhan A.4, Beesham A.5
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Affiliations:
- Research Institute for Astronomy and Astrophysics of Maragha (RIAAM)
- Institute of Experimental Physics
- Bogoliubov Laboratory of Theoretical Physics
- Department of Mathematics, Institute of Applied Sciences and Humanities
- Department of Mathematical Sciences
- Issue: Vol 23, No 3 (2017)
- Pages: 219-229
- Section: Article
- URL: https://journals.rcsi.science/0202-2893/article/view/176084
- DOI: https://doi.org/10.1134/S0202289317030136
- ID: 176084
Cite item
Abstract
Recently, some authors considered the origin of a type-IV singular bounce in modified gravity and obtained the explicit form of F(R) which can produce this type of cosmology. In this paper, we show that during the contracting branch of type-IV bouncing cosmology, the sign of gravity changes, and antigravity emerges. In our model, M0 branes get together and shape a universe, an anti-universe, and a wormhole which connects them. As time passes, this wormhole is dissolved in the universes, F(R) gravity emerges, and the universe expands. When the brane universes become close to each other, the squared energy of their system becomes negative, and some tachyonic states are produced. To remove these states, universes are assumed to be compact, the sign of compacted gravity changes, and anti-F(R) gravity arises, which causes getting away of the universes from each other. In this theory, a Type-IV singularity occurs at t = ts, which is the time of producing tachyons between expansion and contraction branches.
About the authors
Alireza Sepehri
Research Institute for Astronomy and Astrophysics of Maragha (RIAAM)
Author for correspondence.
Email: alireza.sepehri@uk.ac.ir
Iran, Islamic Republic of, Maragha
Richard Pincak
Institute of Experimental Physics; Bogoliubov Laboratory of Theoretical Physics
Email: alireza.sepehri@uk.ac.ir
Slovakia, Watsonova 47, Kosice, 043 53; Dubna, Moscow region, 141980
Anirudh Pradhan
Department of Mathematics, Institute of Applied Sciences and Humanities
Email: alireza.sepehri@uk.ac.ir
India, Mathura, Uttar Pradesh, 281 406
A. Beesham
Department of Mathematical Sciences
Email: alireza.sepehri@uk.ac.ir
South Africa, Kwa-Dlangezwa, 3886