Zobrazeno 1 - 10
of 24
pro vyhledávání: '"Delgado, P. C. M."'
It has been shown that a three-point correlation function of tensor perturbations from a bounce model in general relativity with a minimally-coupled scalar field is highly suppressed, and the resultant three-point function of cosmic microwave backgro
Externí odkaz:
http://arxiv.org/abs/2404.14393
Publikováno v:
Phys. Rev. D 109, 043531 (2024)
A very simple non-singular inflationary model is presented where the unique matter content is a radiation fluid. The model slowly contracts from a very large, almost empty and flat spacetime and realizes a bounce. It is then launched to a quasi-de Si
Externí odkaz:
http://arxiv.org/abs/2310.16250
Autor:
Delgado, Paola C. M.
Publikováno v:
Phys. Rev. D 108, 123539, 2023
Ultra-Light Dark Matter (ULDM) halos constituted by Ultra-Light Axions (ULAs) generate gravitational potentials that oscillate in time. In this paper I show these potentials interact with gravitational waves, resonantly amplifying them. For all ULA m
Externí odkaz:
http://arxiv.org/abs/2309.09946
Autor:
Delgado, Paola C. M.
This review presents an introduction to Quantum Cosmology, including the mathematical methods essential to the canonical approach, some of the existing conceptual problems and the connection of the models to possible observables.
Comment: 11 pag
Comment: 11 pag
Externí odkaz:
http://arxiv.org/abs/2308.07355
Publikováno v:
Phys. Rev. Lett. 130, 191002 (2023)
Bouncing models of cosmology, as they arise e.g. in loop quantum cosmology, can be followed by an inflationary phase and generate close-to-scale-invariant fluctuation spectra as observed in the Cosmic Microwave Background (CMB). However, they are typ
Externí odkaz:
http://arxiv.org/abs/2212.05977
Publikováno v:
Physics of the Dark Universe, Volume 40, May 2023, 101202
We study the parametric resonance excitation of the electromagnetic field by a gravitational wave. We show that there is narrow band resonance. For an electromagnetic field in the vacuum the resonance occurs only in the second band, and its strength
Externí odkaz:
http://arxiv.org/abs/2205.08767
The first edition of the event As Astrocientistas: the Brazilian Meeting of Women and Girls in Astrophysics, Cosmology, and Gravitation, happened in February 2021. It gathered great names of Brazilian science to pay homage to Brazilian female researc
Externí odkaz:
http://arxiv.org/abs/2202.01205
We analyze the effects of the holographic dark energy model in a single field slow-roll inflation, taking into account both the holographic and the dark radiation components. In particular, we obtain the background evolution and compute the scalar an
Externí odkaz:
http://arxiv.org/abs/2111.05760
Publikováno v:
JCAP11(2021)024
In this paper we compute the CMB bispectrum for bouncing models motivated by Loop Quantum Cosmology. Despite the fact that the primordial bispectrum of these models is decaying exponentially above a large pivot scale, we find that the cumulative sign
Externí odkaz:
http://arxiv.org/abs/2108.06175
Publikováno v:
Phys. Rev. D 102 (2020) 063529
The baryon-antibaryon asymmetry (excess of matter over antimatter in our Universe), indicated by observational data from the Cosmic Microwave Background anisotropies, predictions of primordial Nucleosynthesis, and the absence of intense radiation fro
Externí odkaz:
http://arxiv.org/abs/2010.04807