6 papers
Single field matter bounce with dark energy era: comparison with CMB Planck 2018 data and best fit parameters
Rodrigo F. Pinheiro, Nelson Pinto-Neto
In this work, we perform Markov Chain Monte Carlo (MCMC) analyses using the Planck 2018 cosmic microwave background (CMB) datasets, including temperature, polarization, and lensing…
Two Fluid Quantum Bouncing Cosmology I: Theoretical Model
Sandro D. P. Vitenti, Nelson Pinto-Neto, Patrick Peter +1
Bouncing cosmologies offer an alternative to inflation by resolving the initial singularity through a contracting phase followed by a bounce into expansion. In many such models, th…
Primordial Black Hole Formation in Dust-Radiation Bouncing Cosmologies
Xuan Ye, Luiz Felipe Demetrio, Eduardo Jose Barroso +2
Primordial black holes (PBHs) provide a unique probe of the early Universe and may have an enhanced abundance in bouncing cosmologies, where a long contracting phase can amplify pe…
Quantum cosmological perturbations in bouncing models with mimetic dark matter
Idaiane L. Machado, Dêivid R. da Silva, Dêivid R. da Silva +1
We calculate the power spectrum of cosmological perturbations originated from quantum vacuum fluctuations in bouncing scenarios proposed in Ref.~\cite{chamseddine2014cosmology} in…
Bouncing completion of eternal inflation
Alexsandre L. Ferreira, Nelson Pinto-Neto, Vanessa N. Xavier
Using a purely kinematical argument, the Borde-Guth-Vilenkin (BGV) theorem states that any maximal space-time with average positive expansion is geodesically incomplete, hence past…
Dynamical analysis of quantum matter bounces with dark sector mimickers
Francisco Bento Lustosa, Nelson Pinto-Neto
We study the effects of the inclusion of fluids In bounce scenarios driven by an exponential potential scalar field. Most solutions exhibit well known tracking behavior between the…