Zobrazeno 1 - 10
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pro vyhledávání: '"Neves, Rita"'
Autor:
Neves, Rita B.
The standard model of cosmology assumes a homogeneous and isotropic universe that undergoes a period of exponential expansion very early on, named inflation. This stretches quantum fluctuations from the onset of inflation to cosmological scales, whic
Externí odkaz:
http://arxiv.org/abs/2410.14435
We study the scalar modes that, being observable today, were trans-Planckian before inflation, within the context of hybrid Loop Quantum Cosmology (LQC). We analyse the dynamics of these highly ultraviolet modes by introducing modified dispersion rel
Externí odkaz:
http://arxiv.org/abs/2402.08375
Publikováno v:
Phys.Rev.D 108 (2023) 10, 103508
In this work we investigate observational signatures of a primordial power spectrum with exponential infrared suppression, motivated by the choice of a non-oscillatory vacuum in a bouncing and inflationary geometry within Loop Quantum Cosmology (LQC)
Externí odkaz:
http://arxiv.org/abs/2305.09599
Publikováno v:
J. High Energ. Phys. 2023, 93 (2023)
States of low energy in cosmology minimise the energy density when smeared in a chosen time interval. We extend such construction to generic homogeneous (possibly anisotropic) particle creation settings. Focusing on the Schwinger effect, we study the
Externí odkaz:
http://arxiv.org/abs/2303.15294
Autor:
Holmes, John, Sasso, Alessandro, Hernández Alava, Mónica, Borges Neves, Rita, Stevely, Abigail K, Warde, Alan, Meier, Petra S
Publikováno v:
In International Journal of Drug Policy May 2024 127
Recently, States of Low Energy (SLEs) have been proposed as viable vacuum states of primordial perturbations within Loop Quantum Cosmology (LQC). In this work we investigate the effect of the high curvature region of LQC on the definition of SLEs. Sh
Externí odkaz:
http://arxiv.org/abs/2104.14850
Publikováno v:
Phys. Rev. D 103, 123524 (2021)
In generic Friedmann-Lema\^itre-Robertson-Walker spacetimes, States of Low Energy (SLEs) are defined to minimize the regularized energy density smeared along the time-like curve of an isotropic observer, which is specified via a smearing function. Fo
Externí odkaz:
http://arxiv.org/abs/2104.03035
Autor:
Neves, Rita
The proposal of increasingly complex and innovative space endeavours poses growing demands for mission designers. In order to meet the established requirements and constraints while maintaining a low fuel cost, the use of low-energy trajectories is p
Externí odkaz:
http://arxiv.org/abs/2006.03872
Publikováno v:
Mathematics 2020, 8(2), 186
We provide an analytical solution to the quantum dynamics of a flat Friedmann-Lema\^itre- Robertson-Walker model with a massless scalar field in the presence of a small and positive cosmological constant, in the context of Loop Quantum Cosmology. We
Externí odkaz:
http://arxiv.org/abs/2001.02918
Publikováno v:
Phys. Rev. D 99, 043525 (2019)
The dynamics of a flat Friedmann-Lema\^{i}tre-Robertson-Walker model minimally coupled to a massless scalar field has been intensively studied in the context of Loop Quantum Cosmology. This model admits an appropriate solvable representation, named s
Externí odkaz:
http://arxiv.org/abs/1901.05091