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Keywords = megnetogenesis

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19 pages, 635 KiB  
Article
About Jordan and Einstein Frames: A Study in Inflationary Magnetogenesis
by Joel Velásquez, Héctor J. Hortua and Leonardo Castañeda
Universe 2024, 10(9), 350; https://doi.org/10.3390/universe10090350 - 1 Sep 2024
Cited by 1 | Viewed by 1023
Abstract
In this paper, we make a detailed side-by-side comparison between Jordan and Einstein frames in the context of cosmic magnetogenesis. We have computed the evolution of the vector potential in each frame along with some observables such as the spectral index and the [...] Read more.
In this paper, we make a detailed side-by-side comparison between Jordan and Einstein frames in the context of cosmic magnetogenesis. We have computed the evolution of the vector potential in each frame along with some observables such as the spectral index and the magnetic field amplitude. We found that contrary to the Einstein frame, the electric and magnetic energy densities in the Jordan Frame do not depend on any parameter associated with the scalar field. Furthermore, in the Einstein frame, and assuming scale invariance for the magnetic field, most of the total energy density contribution comes from the electric and magnetic densities. Finally, we show the ratio between magnetic field signals in both frames printed in the CMB. Full article
(This article belongs to the Special Issue The Nature of Dark Energy)
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