L
Lorenzo Sebastiani
Researcher at Istituto Nazionale di Fisica Nucleare
Publications - 85
Citations - 3739
Lorenzo Sebastiani is an academic researcher from Istituto Nazionale di Fisica Nucleare. The author has contributed to research in topics: Inflation (cosmology) & Scalar field. The author has an hindex of 24, co-authored 81 publications receiving 3241 citations. Previous affiliations of Lorenzo Sebastiani include L.N.Gumilyov Eurasian National University & University of Trento.
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Class of viable modified f(R) gravities describing inflation and the onset of accelerated expansion
Guido Cognola,Emilio Elizalde,Shin'ichi Nojiri,Sergei D. Odintsov,Lorenzo Sebastiani,Sergio Zerbini +5 more
TL;DR: In this article, a general approach to viable modified f(R) gravity is developed in both the Jordan and the Einstein frames, and a class of exponential, realistic modified gravities is introduced and investigated with care.
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Finite-time future singularities in modified Gauss-Bonnet and $\mathcal{F}(R,G)$ gravity and singularity avoidance
TL;DR: In this paper, the authors studied all four types of finite-time future singularities emerging in late-time accelerating (effective quintessence/phantom) era from the Ricci scalar and the Gauss-Bonnet invariant, respectively.
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Finite-time future singularities in modified Gauss–Bonnet and ℱ(R,G) gravity and singularity avoidance
TL;DR: In this paper, the authors studied all four types of finite-time future singularities emerging in the late-time accelerating (effective quintessence/phantom) era from ℱ(R,G)-gravity, where R and G are the Ricci scalar and the Gauss-Bonnet invariant, respectively.
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Nonsingular exponential gravity: A simple theory for early- and late-time accelerated expansion
Emilio Elizalde,S. Nojiri,Sergei D. Odintsov,Sergei D. Odintsov,Lorenzo Sebastiani,Sergio Zerbini +5 more
TL;DR: A theory of exponential modified gravity which explains both early-time inflation and late-time acceleration, in a unified way, is proposed in this article, which successfully passes the local tests and fulfills the cosmological bounds and remarkably, the corresponding inflationary era is proven to be unstable.
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Static spherically symmetric solutions in F(R) gravity
TL;DR: In this paper, a Lagrangian derivation of the Equations of Motion (EOM) for static spherically symmetric metrics in F(R) modified gravity is presented.