Abstract
We study gravitational collapse for the Starobinsky R2 model, a particular example of an f(r) theory, in a spherically symmetric spacetime. We add a massless scalar field as matter content to the spacetime. We work in the Einstein frame, where an additional scalar field arises due to the conformal transformation. As in general relativity, depending on the initial data, we found that the gravity scalar field and the physical scalar field can collapse, forming a black hole, in which the final solution is the Schwarzschild metric. We found the threshold of black hole formation through a fine-tuning method and studied critical collapse near this regime.
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Acknowledgments
The author would like to thank VRIEA-PUCV. All simulations were executed on the Chaska Cluster at Instituto de Física, PUCV.
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Baez, Y.R. Critical collapse for the Starobinsky R2 model. J. High Energ. Phys. 2023, 19 (2023). https://doi.org/10.1007/JHEP05(2023)019
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DOI: https://doi.org/10.1007/JHEP05(2023)019