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Sudden singularities in generalized hybrid metric-Palatini cosmologies

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0 Published in 2021 at "Journal of Cosmology and Astroparticle Physics"

DOI: 10.1088/1475-7516/2021/07/009

Abstract: 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… read more here.

Keywords: time; sudden singularities; generalized hybrid; metric palatini ... See more keywords

Cosmic strings in generalized hybrid metric-Palatini gravity

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0 Published in 2021 at "Physical Review D"

DOI: 10.1103/physrevd.104.124056

Abstract: Tiberiu Harko ID† Department of Theoretical Physics, National Institute of Physics and Nuclear Engineering (IFIN-HH), Bucharest, 077125 Romania, Astronomical Observatory, 19 Ciresilor Street, 400487 Cluj-Napoca, Romania, Department of Physics, Babes-Bolyai University, Kogalniceanu Street, Cluj-Napoca 400084,… read more here.

Keywords: physics; generalized hybrid; metric palatini; hybrid metric ... See more keywords

Wormholes in generalized hybrid metric-Palatini gravity obeying the matter null energy condition everywhere

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0 Published in 2018 at "Physical Review D"

DOI: 10.1103/physrevd.98.064054

Abstract: Wormhole solutions in a generalized hybrid metric-Palatini matter theory, given by a gravitational Lagrangian $f\left(R,\cal{R}\right)$, where $R$ is the metric Ricci scalar, and $\mathcal{R}$ is a Palatini scalar curvature defined in terms of an independent… read more here.

Keywords: null energy; matter; palatini; generalized hybrid ... See more keywords

Spherically Symmetric Black Holes and Wormholes in Hybrid Metric-Palatini Gravity

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0 Published in 2019 at "Gravitation and Cosmology"

DOI: 10.1134/s0202289319040030

Abstract: The so-called hybrid metric-Palatini theory of gravity (HMPG), proposed in 2012 by T. Harko et al., is known to successfully describe both local (solar-system) and cosmological observations. This paper gives a complete description of static,… read more here.

Keywords: theory; metric palatini; scalar tensor; hybrid metric ... See more keywords

Spherically Symmetric Space-Times in Generalized Hybrid Metric-Palatini Gravity

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0 Published in 2021 at "Gravitation and Cosmology"

DOI: 10.1134/s0202289321040046

Abstract: We discuss vacuum static, spherically symmetric asymptotically flat solutions of the generalized hybrid metric-Palatini theory of gravity (generalized HMPG) suggested by Böhmer and Tamanini, involving both a metric gμν and an independent connection Γ̂ α… read more here.

Keywords: spherically symmetric; generalized hybrid; metric palatini; hybrid metric ... See more keywords