Constraints on the production of primordial magnetic seeds in pre-big bang cosmology

Abstract

We study the amplification of the electromagnetic fluctuations, and the production of "seeds" for the cosmic magnetic fields, in a class of string cosmology models whose scalar and tensor perturbations reproduce current observations and satisfy known phenomenological constraints. We find that the condition of efficient seeds production can be satisfied and compatible with all constraints only in a restricted region of parameter space, but we show that such a region has significant intersections with the portions of parameter space where the produced background of relic gravitational waves is strong enough to be detectable by aLIGO/Virgo and/or by eLISA.

20 pages, 3 figures. The discussion of the process of seed production is limited to the case of growing electromagnetic coupling. A new figure added, typos corrected. To appear in JCAP (2017)

References in corpus (4)

• GW150914: Implications for the stochastic gravitational wave background from binary black holes
• Magnetic fields from inflation?
• Improved Upper Limits on the Stochastic Gravitational-Wave Background from 2009-2010 LIGO and Virgo Data
• Observable gravitational waves in pre-big bang cosmology: an update

Cited by in corpus (8)

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• Primordial Helical Magnetic Fields from Inflation?
• Sourced fluctuations in generic slow contraction
• Primordial Black Holes from Pre-Big Bang inflation
• From pre- to post-big bang: an (almost) self-dual cosmological history
• Sourced Scalar Fluctuations in Bouncing Cosmology
• Magnetic Seed and Cosmology as Quantum Hall Effect
• On the initial regime of pre-big bang cosmology