708 citations · 1.7k across the 9 of their papers we have counts for
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Constraints on scalar-tensor models of dark energy from observational and local gravity tests
Shinji Tsujikawa, Kotub Uddin, Shuntaro Mizuno +2
We construct a family of viable scalar-tensor models of dark energy (DE) which possess a phase of late-time acceleration preceded by a standard matter era, while at the same time s…
Density perturbations in f(R) gravity theories in metric and Palatini formalisms
Shinji Tsujikawa, Kotub Uddin, Reza Tavakol
We make a detailed study of matter density perturbations in both metric and Palatini formalisms in theories whose Lagrangian density is a general function, f(R), of the Ricci scala…
f(R) gravity theories in Palatini formalism: cosmological dynamics and observational constraints
Stephane Fay, Reza Tavakol, Shinji Tsujikawa
We make a systematic study of the cosmological dynamics for a number of f(R) gravity theories in Palatini formalism. We find a number of interesting results: (i) models based on th…
Observational constraints on patch inflation in noncommutative spacetime
Gianluca Calcagni, Shinji Tsujikawa
We study constraints on a number of patch inflationary models in noncommutative spacetime using a compilation of recent high-precision observational data. In particular, the four-d…