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67 papers · 1 filter
Viaggiu holographic dark energy in light of DESI DR2
Amlan K. Halder, Andronikos Paliathanasis, Stefano Viaggiu +2
We test the cosmological viability of the Viaggiu holographic dark energy (VHDE) model by using late-time observational data. In particular, we place constraints on the free parame…
Unified dynamical system formulations for gravity with applications to nonminimal derivative coupling and -Higgs inflation
Saikat Chakraborty, Sergio E. Jorás, 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 family.…
Cosmological perturbations in Energy-Momentum Squared Gravity
Peter K. S. Dunsby, Maria-Alexia Caldis, Eduardo Bittencourt
We present a fully covariant and gauge-invariant analysis of linear cosmological perturbations in Energy-Momentum Squared Gravity. Working within the 1+3 formalism, we derive the e…
Observational constraints on the modified cosmology inspired by string T-duality
G. G. Luciano, A. Paliathanasis, A. Sheykhi
We explore the cosmological consequences of a modified cosmology inspired by string T-duality. We incorporate the zero-point length correction, , into the gravitational potent…
III. Interacting Dark Energy: Summary of Models, Pathologies, and Constraints
Marcel van der Westhuizen, Amare Abebe, Eleonora Di Valentino
We present an overview of the main results from our two companion papers that are relevant for observational constraints on interacting dark energy (IDE) models. We provide analyti…
Compact Stars in Symmetric Teleparallel Scalar-Tensor Gravity
Grigorios Panotopoulos, Andrés Lueiza-Colipí, Nikolaos Dimakis +1
We investigate the existence of static, spherically symmetric compact objects within the framework of symmetric teleparallel scalar-tensor gravity. This theory extends the Brans-Di…