RT Journal Article
T1 Sudden singularities in generalized hybrid metric-Palatini cosmologies
A1 Rosa, Joao Luis
A1 Lobo, Francisco S. N.
A1 Rubiera García, Diego
AB 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.
PB IOP Publishing
SN 1475-7516
YR 2021
FD 2021-07
LK https://hdl.handle.net/20.500.14352/4475
UL https://hdl.handle.net/20.500.14352/4475
LA eng
NO © 2021 Iop PublishingJLR 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.
NO Fondo Europeo de Desarrollo Regional (FEDER)
NO Ministerio de Economía y Competitividad (MINECO)/FEDER
NO Ministerio de Ciencia e Innovación (MICINN)
NO Comunidad de Madrid
NO Generalitat Valenciana
NO Fundação para a Ciência e a Tecnologia (FCT)
NO FAPESQ-PB/CNPQ
DS Docta Complutense
RD 5 abr 2025