217 citations · 2.3k across the 54 of their papers we have counts for
7 papers · 1 filter
Unimodular Gravity
S. Nojiri, S. D. Odintsov, V. K. Oikonomou
We extend the formalism of the Einstein-Hilbert unimodular gravity in the context of modified gravity. After appropriately modifying the Friedmann-Robertson-Walker metric in…
Singular Accelerated Evolution in Massive Bigravity
S. Nojiri, S. D. Odintsov, V. K. Oikonomou
The possibility to have singular accelerated evolution in the context of bimetric gravity is investigated. Particularly, we study two singular models of cosmological evoluti…
Inflation in exponential scalar model and finite-time singularity induced instability
S. D. Odintsov, V. K. Oikonomou
We investigate how a Type IV future singularity can be included in the cosmological evolution of a well-known exponential model of inflation. In order to achieve this we use a two…
Singular inflation from generalized equation of state fluids
S. Nojiri, S. D. Odintsov, V. K. Oikonomou
We study models with a generalized inhomogeneous equation of state fluids, in the context of singular inflation, focusing to so-called Type IV singular evolution. In the simplest c…
Modified Gauss-Bonnet gravity with Lagrange multiplier constraint as mimetic theory
Artyom V. Astashenok, Sergei D. Odintsov, V. K. Oikonomou
In this paper we propose and extensively study mimetic modified gravity models, with various scenarios of cosmological evolution, with or without extra matter fluids.…
Singular deformations of nearly inflation potentials
S. D. Odintsov, V. K. Oikonomou
We investigate in which cases a singular evolution with a singularity of Type IV, can be consistently incorporated in deformations of the inflationary potential. After demons…
A quantitative analysis of singular inflation with scalar-tensor and modified gravity
S. Nojiri, S. D. Odintsov, V. K. Oikonomou
We provide a detailed quantitative description of singular inflation. Its close analogy with finite-time future singularity which is associated to dark energy era is described. Cal…