Bouncing quantum cosmology
N Pinto-Neto - Universe, 2021 - mdpi.com
The goal of this contribution is to present the properties of a class of quantum bouncing
models in which the quantum bounce originates from the Dirac canonical quantization of a …
models in which the quantum bounce originates from the Dirac canonical quantization of a …
Bohmian quantum gravity and cosmology
N Pinto-Neto, W Struyve - Applied Bohmian Mechanics, 2019 - taylorfrancis.com
This chapter focuses on canonical quantum gravity and discusses how many conceptual
problems, such as the measurement problem and the problem of time, can be overcome by …
problems, such as the measurement problem and the problem of time, can be overcome by …
Consistent scalar and tensor perturbation power spectra in single fluid matter bounce with dark energy era
AP Bacalhau, N Pinto-Neto, SDP Vitenti - Physical Review D, 2018 - APS
We investigate cosmological scenarios containing one canonical scalar field with an
exponential potential in the context of bouncing models, in which the bounce happens due …
exponential potential in the context of bouncing models, in which the bounce happens due …
Particle creation in bouncing cosmologies
DCF Celani, N Pinto-Neto, SDP Vitenti - Physical Review D, 2017 - APS
We investigate scalar particle creation in a set of bouncing models where the bounce occurs
due to quantum cosmological effects described by the Wheeler-DeWitt equation. The scalar …
due to quantum cosmological effects described by the Wheeler-DeWitt equation. The scalar …
Evolution of quantum non-equilibrium for coupled harmonic oscillators
FB Lustosa, N Pinto-Neto… - Proceedings of the …, 2023 - royalsocietypublishing.org
In the context of de Broglie–Bohm pilot-wave theory, violations of the Born rule are allowed
and can be considered as describing non-equilibrium distributions. We study the effects of …
and can be considered as describing non-equilibrium distributions. We study the effects of …
Primordial features from ekpyrotic bounces
RN Raveendran, L Sriramkumar - Physical Review D, 2019 - APS
Certain features in the primordial scalar power spectrum are known to improve the fit to the
cosmological data. We examine whether bouncing scenarios can remain viable if future data …
cosmological data. We examine whether bouncing scenarios can remain viable if future data …
Viable tensor-to-scalar ratio in a symmetric matter bounce
RN Raveendran, D Chowdhury… - Journal of Cosmology …, 2018 - iopscience.iop.org
Matter bounces refer to scenarios wherein the universe contracts at early times as in a
matter dominated epoch until the scale factor reaches a minimum, after which it starts …
matter dominated epoch until the scale factor reaches a minimum, after which it starts …
The de Broglie–Bohm quantum theory and its application to quantum cosmology
N Pinto-Neto - Universe, 2021 - mdpi.com
We review the de Broglie–Bohm quantum theory. It is an alternative description of quantum
phenomena in accordance with all the quantum experiments already performed. Essentially …
phenomena in accordance with all the quantum experiments already performed. Essentially …
Viable scalar spectral tilt and tensor-to-scalar ratio in near-matter bounces
RN Raveendran, L Sriramkumar - Physical Review D, 2019 - APS
In a recent work, we constructed a model consisting of two fields—a canonical scalar field
and a noncanonical ghost field—that sourced a symmetric matter bounce scenario. The …
and a noncanonical ghost field—that sourced a symmetric matter bounce scenario. The …
Fermion production in bouncing cosmologies
A Scardua, LF Guimarães, N Pinto-Neto, GS Vicente - Physical Review D, 2018 - APS
We address the issue of fermionic particle creation in cosmological bouncing models
governed by general relativity, but where the bounce itself takes place due to quantum …
governed by general relativity, but where the bounce itself takes place due to quantum …