3 papers
gr-qc2026
Regularized vacuum stress tensor of a scalar field as the inflaton or dark energy
Xuan Ye
We study the regularized vacuum stress tensor of scalar fields in maximally symmetric spacetime and assess the feasibility of driving primordial inflation or current cosmic acceler…
gr-qc2026
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…
astro-ph.CO2024
Primordial Black Hole Formation in a Dust Bouncing Model
E. J. Barroso, L. F. Demétrio, S. D. P. Vitenti +1
Linear scalar cosmological perturbations have increasing spectra in the contracting phase of bouncing models. We study the conditions for which these perturbations may collapse int…