Bounce cosmology in $$f({\mathcal {R}})$$ f ( R ) gravity

M. Ilyas (Institute of Physics, Gomal University, Dera Ismail Khan, Khyber Pakhtunkhwa, 29220, Pakistan) ; W. Rahman (Department of Physics, Abdul Wali khan University Mardan, Mardan, 23200, Pakistan)

In this paper, we analyze the modified $$f({\mathcal {R}})$$ f ( R ) gravity models in Friedmann–Lemaître–Robertson–Walker (FLRW) background. The actions of bouncing cosmology are studied under consideration of different viable models in $$f({\mathcal {R}})$$ f ( R ) gravity theory that can resolve the difficulty of singularity in standard Big-Bang cosmology. Under different viable models in $$f({\mathcal {R}})$$ f ( R ) gravity theory, the cosmological constraints are plotted in provisions of cosmic-time, then investigated the bounce circumstance. In addition, the red-shift parameter is used to reconstruct the modified gravity, and compile the cosmological parameters that infer accelerated universe expansion. Finally, the situation stability is evaluated with a sound speed feature, which illustrates late-time stability.

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      "value": "In this paper, we analyze the modified  $$f({\\mathcal {R}})$$  <math> <mrow> <mi>f</mi> <mo>(</mo> <mi>R</mi> <mo>)</mo> </mrow> </math>   gravity models in Friedmann\u2013Lema\u00eetre\u2013Robertson\u2013Walker (FLRW) background. The actions of bouncing cosmology are studied under consideration of different viable models in  $$f({\\mathcal {R}})$$  <math> <mrow> <mi>f</mi> <mo>(</mo> <mi>R</mi> <mo>)</mo> </mrow> </math>   gravity theory that can resolve the difficulty of singularity in standard Big-Bang cosmology. Under different viable models in  $$f({\\mathcal {R}})$$  <math> <mrow> <mi>f</mi> <mo>(</mo> <mi>R</mi> <mo>)</mo> </mrow> </math>   gravity theory, the cosmological constraints are plotted in provisions of cosmic-time, then investigated the bounce circumstance. In addition, the red-shift parameter is used to reconstruct the modified gravity, and compile the cosmological parameters that infer accelerated universe expansion. Finally, the situation stability is evaluated with a sound speed feature, which illustrates late-time stability."
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Published on:
16 February 2021
Publisher:
Springer
Published in:
European Physical Journal C , Volume 81 (2021)
Issue 2
Pages 1-9
DOI:
https://doi.org/10.1140/epjc/s10052-021-08955-7
Copyrights:
The Author(s)
Licence:
CC-BY-4.0

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