Sudden singularities in generalized hybrid metric-Palatini cosmologies



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Rosa, Joao Luis and Lobo, Francisco S. N. and Rubiera García, Diego (2021) Sudden singularities in generalized hybrid metric-Palatini cosmologies. Journal of cosmology and astroparticle physics (7). ISSN 1475-7516

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In this work, we explore cosmological sudden singularities arising in the dynamically equivalent scalar-tensor representation of generalized hybrid metric-Palatini gravity. Using a FLRW background, we show that the structure of the field equations prevents sudden singularities from arising at time derivatives of the scale factor of orders lower than four, but that they are allowed to appear for time derivatives of higher orders. Imposing an ansatz for the scale factor, we provide an explicit solution where these sudden singularities appear in the fourth-order time derivative of the scale factor. A comparison of the Hubble and deceleration parameters arising from this model with the experimental measurements from the Planck Satellite allow us to impose constraints on the time span for which the occurrence of sudden singularities becomes likely in our universe, as measured from the Big Bang.

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© 2021 Iop Publishing
JLR was supported by the European Regional Development Fund and the programme Mobilitas Pluss (MOBJD647). FSNL acknowledges support from the FCT Scientific Employment Stimulus contract with reference CEECINST/00032/2018 and funding from FCT Projects No. UID/FIS/04434/2020, No. CERN/FIS-PAR/0037/2019 and No. PTDC/FISOUT/29048/2017. DRG is funded by the Atraccion de Talento Investigador programme of the Comunidad de Madrid (Spain) No. 2018-T1/TIC-10431, and acknowledges further support from the Ministerio de Ciencia, Innovacion y Universidades (Spain) project No. PID2019108485GB-I00/AEI/10.13039/501100011033, the Spanish project No. FIS2017-84440-C2-1-P (MINECO/FEDER, EU), the project PROMETEO/2020/079 (Generalitat Valenciana), and the Edital 006/2018 PRONEX (FAPESQ-PB/CNPQ, Brazil) Grant No. 0015/2019.

Uncontrolled Keywords:Modified Gravity; Black-holes; Wormholes; Space
Subjects:Sciences > Physics > Physics-Mathematical models
Sciences > Physics > Mathematical physics
ID Code:68105
Deposited On:15 Oct 2021 17:55
Last Modified:18 Oct 2021 07:14

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