9 citations · 24 across the 9 of their papers we have counts for
9 papers
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…
Extending the Euler-Heisenberg action to include effects of local Lorentz-symmetry violating backgrounds
Wagno Cesar e Silva, João Paulo S. Melo, José A. Helayël-Neto
This work sets out to compute the corrections to the Euler-Heisenberg effective action that arise from spacetime-dependent background anisotropies that violate Lorentz symmetry. To…
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…
SUSY QED with Lorentz-asymmetric fermionic matter and a glance at the electron's EDM
João Paulo S. Melo, Wagno Cesar e Silva, José A. Helayël-Neto
This contribution sets out to pursue the investigation of a supersymmetric electrodynamics model with Lorentz-symmetry violation (LSV) manifested by a space-time unbalance in the p…
Effective approach to the Antoniadis-Mottola model: quantum decoupling of the higher derivative terms
Wagno Cesar e Silva, Ilya L. Shapiro
We explore the decoupling of massive ghost mode in the (four-dimensional) theory of the conformal factor of the metric. The model was introduced by Antoniadis and Mottola in […
Trace anomaly and induced action for a metric-scalar background
Manuel Asorey, Wagno Cesar e Silva, Ilya L. Shapiro +1
The conformal anomaly and anomaly-induced effective action represent useful and economic ways to describe semiclassical contributions to the action of gravity. We discuss the anoma…
On the vector conformal models in an arbitrary dimension
Manuel Asorey, Lesław Rachwał, Ilya L. Shapiro +1
The conventional model of the gauge vector field is invariant under the local conformal symmetry only in the four-dimensional space (). Conformal generalization to an arbitrary…
Bounce and stability in the early cosmology with anomaly-induced corrections
Wagno Cesar e Silva, Ilya L. Shapiro
An extremely fast exponential expansion of the Universe is typical for the stable version of the inflationary model, based on the anomaly-induced action of gravity. The total amoun…