669 citations · 863 across the 13 of their papers we have counts for
6 papers · 1 filter
Low-energy limit in the anomaly-induced action and the semiclassical cosmological bounce
Wagno Cesar e Silva, Nicolas R. Bertini, Ilya L. Shapiro
In the recently proposed scenario, the cosmological bounce occurs because the initially contracting Universe is not empty. In the region close to singularity, matter contents of th…
Bounce solutions with quantum vacuum effects of massive fields and subsequent Starobinsky inflation
Wagno Cesar e Silva, Samuel W. P. Oliveira, Ilya L. Shapiro
We extend the previous work about the cosmological solutions with a bounce without modifications of gravity or introducing an extra scalar field. The main finding was that the boun…
Semiclassical bounce with strong minimal assumptions
Wagno Cesar e Silva, Ilya L. Shapiro
We explore the possibility of avoiding cosmological singularity with a bounce solution in the early Universe. The main finding is that simple and well-known semiclassical correctio…
Scale-dependent cosmology from effective quantum gravity in the invariant framework
Nicolas R. Bertini, Davi C. Rodrigues, Ilya L. Shapiro
We explore the possibility of a consistent cosmology based on the gauge-fixing independent running of the gravitational and cosmological constants ( and ) in the framework of…
Kantoswki-Sachs model with a running cosmological constant and radiation
Vinicius G. Oliveira, Gil de Oliveira-Neto, Ilya L. Shapiro
The simplest anisotropic model of the early Universe is the one with two conformal factors, which can be identified as Kantowski-Sachs metric, or the reduced version of the Bianchi…
Quantum gravity correction, evolution of scalar field and inflation
J. Acacio de Barros, N. Pinto-Neto, I. L. Shapiro
We take the first nontrivial coefficient of the Schwinger-DeWitt expansion as a leading correction to the action of the second-derivative metric-dilaton gravity. To fix the ambigui…