10. Primordial magnetogenesis in a bouncing model with dark energy

Download the arXiv version here!

Context: An interesting model of quantum bouncing cosmology, composed of a single scalar field with exponential potential, describes a phase of dark energy while being consistent with CMB observations. I investigated whether this model could also explain the origins of large-scale galactic fields.

Method: This paper uses the same method as in 2004.07269: starts the slow contraction phase with an adiabatic vacuum in the far past, analyse the Hamilton equations of the gauge fields, and compute the numerical evolution with the NumCosmo library.

Results:

• Well-defined vacuum.
• No backreaction from the electromagnetic field on the background.
• The electric and magnetic power spectra are time depenent, with spectral indices between 0 and 4.
• Amplitude of magnetic fields consistent with observations on scales \(>1\) Megaparsec!