3 papers
gr-qc2026
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…
hep-th2026
Extending the Euler-Heisenberg action to include effects of local Lorentz-symmetry violating backgrounds
Wagno Cesar e Silva, João Paulo S. Melo, João Paulo S. Melo +2
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…
gr-qc2025
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…