Primordial scalar power spectrum from the Euclidean big bounce

Schander S, Barrau A, Bolliet B, Linsefors L, Mielczarek J, Grain J (2016)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2016


Publisher: American Physical Society

Book Volume: 93

Article Number: 023531

Journal Issue: 2

DOI: 10.1103/PhysRevD.93.023531


In effective models of loop quantum cosmology, the holonomy corrections are associated with deformations of space-time symmetries. The most evident manifestation of the deformations is the emergence of a Euclidean phase accompanying the nonsingular bouncing dynamics of the scale factor. In this article, we compute the power spectrum of scalar perturbations generated in this model, with a massive scalar field as the matter content. Instantaneous and adiabatic vacuum-type initial conditions for scalar perturbations are imposed in the contracting phase. The evolution through the Euclidean region is calculated based on the extrapolation of the time direction pointed by the vectors normal to the Cauchy hypersurface in the Lorentzian domains. The obtained power spectrum is characterized by a suppression in the IR regime and oscillations in the intermediate energy range. Furthermore, the speculative extension of the analysis in the UV reveals a specific rise of the power leading to results incompatible with the data.

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Schander, S., Barrau, A., Bolliet, B., Linsefors, L., Mielczarek, J., & Grain, J. (2016). Primordial scalar power spectrum from the Euclidean big bounce. Physical Review D, 93(2).


Schander, Susanne, et al. "Primordial scalar power spectrum from the Euclidean big bounce." Physical Review D 93.2 (2016).

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