A. Saa

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20242026

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gr-qc2026

Robinson-Trautman spacetimes in (2+1) dimensions

Alberto Saa

We propose a Robinson-Trautman evolution in $(2 + 1)$ -dimensional spacetime that retains key structural features of the four-dimensional case. We consider a recently studied exact fa…

gr-qc2026

Unified dynamical system formulations for $f (R, I ¨ , X)$ gravity with applications to nonminimal derivative coupling and $R^{2}$ -Higgs inflation

Saikat Chakraborty, Sergio E. JorÃ¡s, Alberto Saa

Two different dynamical system formulations are presented that can be implemented to analyze a rather large class of modified gravity theories within the generic $f (R, I ¨ , X)$ family…

nlin.AO2026

Evolving scale-free networks and node-based random edge deletion

Everton R. Constantino, Alberto Saa

We investigate a growing network model that combines preferential and uniform attachment with two distinct mechanisms of edge deletion. In addition to the usual uniform probability…

Robinson-Trautman spacetimes in (2+1) dimensions

Unified dynamical system formulations for f(R,I¨,X) gravity with applications to nonminimal derivative coupling and R2-Higgs inflation

Evolving scale-free networks and node-based random edge deletion

Unified dynamical system formulations for $f (R, I ¨ , X)$ gravity with applications to nonminimal derivative coupling and $R^{2}$ -Higgs inflation