Primordial perturbations and inflation in holographic cosmology

Bertini, Nicolas R.; Bilić, Neven; Rodrigues, Davi C. (2020) Primordial perturbations and inflation in holographic cosmology. Physical Review D, 102 (12). ISSN 2470-0010

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Abstract

We consider an inflationary scenario in the holographic braneworld with a cosmological fluid occupying the 3+1 dimensional brane located at the holographic boundary of an asymptotic ADS bulk. The contribution of the boundary conformal field can be represented as a modification of Einstein's equations on the boundary. Using these effective Einstein equations we calculate the cosmological perturbations and derive the corresponding power spectra assuming a general -essence type of inflaton. We find that the braneworld scenario affects the scalar power spectrum only in the speed of sound dependence on the slow-roll parameters whereas there is no change in the tensor power spectrum. This implies that the changes in the spectral indices appear at the second order in the slow-roll parameter expansion.

Item Type:	Article
Uncontrolled Keywords:	inflation; holographic cosmology; cosmological perturbations
Subjects:	NATURAL SCIENCES > Physics
Divisions:	Theoretical Physics Division
Depositing User:	Lorena Palameta
Date Deposited:	29 Jan 2026 09:58
URI:	http://fulir.irb.hr/id/eprint/11182
DOI:	10.1103/PhysRevD.102.123505

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