Primordial power spectra for scalar perturbations in loop quantum cosmology

Daniel Martín De Blas, Javier Olmedo

Resultado de la investigación: Article

23 Citas (Scopus)

Resumen

We provide the power spectrum of small scalar perturbations propagating in an inflationary scenario within loop quantum cosmology. We consider the hybrid quantization approach applied to a Friedmann-Robertson-Walker spacetime with flat spatial sections coupled to a massive scalar field. We study the quantum dynamics of scalar perturbations on an effective background within this hybrid approach. We consider in our study adiabatic states of different orders. For them, we find that the hybrid quantization is in good agreement with the predictions of the dressed metric approach. We also propose an initial vacuum state for the perturbations, and compute the primordial and the anisotropy power spectrum in order to qualitatively compare with the current observations of Planck mission. We find that our vacuum state is in good agreement with them, showing a suppression of the power spectrum for large scale anisotropies. We compare with other choices already studied in the literature.

Idioma originalEnglish
Número de artículo029
PublicaciónJournal of Cosmology and Astroparticle Physics
Volumen2016
N.º6
DOI
EstadoPublished - 14 jun 2016
Publicado de forma externa

Huella dactilar

cosmology
power spectra
scalars
perturbation
vacuum
anisotropy
retarding
predictions

ASJC Scopus subject areas

  • Astronomy and Astrophysics

Citar esto

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Primordial power spectra for scalar perturbations in loop quantum cosmology. / De Blas, Daniel Martín; Olmedo, Javier.

En: Journal of Cosmology and Astroparticle Physics, Vol. 2016, N.º 6, 029, 14.06.2016.

Resultado de la investigación: Article

TY - JOUR

T1 - Primordial power spectra for scalar perturbations in loop quantum cosmology

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AU - Olmedo, Javier

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AB - We provide the power spectrum of small scalar perturbations propagating in an inflationary scenario within loop quantum cosmology. We consider the hybrid quantization approach applied to a Friedmann-Robertson-Walker spacetime with flat spatial sections coupled to a massive scalar field. We study the quantum dynamics of scalar perturbations on an effective background within this hybrid approach. We consider in our study adiabatic states of different orders. For them, we find that the hybrid quantization is in good agreement with the predictions of the dressed metric approach. We also propose an initial vacuum state for the perturbations, and compute the primordial and the anisotropy power spectrum in order to qualitatively compare with the current observations of Planck mission. We find that our vacuum state is in good agreement with them, showing a suppression of the power spectrum for large scale anisotropies. We compare with other choices already studied in the literature.

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