12 citations · 25 across the 9 of their papers we have counts for
9 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…
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…
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…
Quantum cosmological perturbations in bouncing models with mimetic dark matter
Idaiane L. Machado, Dêivid R. da Silva, Nelson Pinto-Neto
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…
The Hubble Tension: Relativistic Dark Matter Production from Long-lived Particles
Alvaro S. de Jesus, Matheus M. A. Paixão, Dêivid R. da Silva +2
The tension between direct measurements of the Hubble constant and those stemming from Cosmic Microwave Background probes has triggered a multitude of studies. The connection betwe…
The H0 trouble: Confronting Non-thermal Dark Matter and Phantom Cosmology with the CMB, BAO, and Type Ia Supernovae data
Simony S da Costa, Dêivid R da Silva, Álvaro S de Jesus +2
We have witnessed different values of the Hubble constant being found in the literature in the past years. Albeit, early measurements often result in an much smaller than tho…
Comments on "Growth of Covariant Perturbations in the Contracting Phase of a Bouncing Universe" by A. Kumar
N. Pinto-Neto, S. D. P. Vitenti
A recent paper by Kumar (2012) (hereafter K12) claimed that in a contracting model, described by perturbations around a collapsing Friedmann model containing dust or radiation, the…