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Scalar current of created pairs by Schwinger mechanism in de Sitter spacetime
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). ICRANet, Italy; Dipartimento di Fisica Università di Roma "La Sapienza", Italy; Université de Nice Sophia Antipolis, France.
Number of Authors: 32016 (English)In: Physical Review D: covering particles, fields, gravitation, and cosmology, ISSN 2470-0010, E-ISSN 2470-0029, Vol. 94, no 10, article id 104011Article in journal (Refereed) Published
Abstract [en]

We consider a charged scalar field in a D-dimensional de Sitter spacetime and investigate pair creation by a Schwinger mechanism in a constant electric field background. Using a semiclassical approximation the current of the created pairs has been estimated. We find that the semiclassical current of the created pairs in the strong electric field limit responds as E-D/2. Going further but restricting to D = 3 dimensional de Sitter spacetime, the quantum expectation value of the spacelike component of the induced current has been computed in the in-vacuum state by applying an adiabatic subtraction scheme. We find that, in the strong electric field limit, the current responds as E-3/2. In the weak electric field limit the current has a linear response in E and an inverse dependence on the mass of the scalar field. In the case of a massless scalar field, the current varies with E-1 which leads to a phenomenon of infrared hyperconductivity. A new relation between infrared hyperconductivity, tachyons, and conformality is discussed, and a scheme to avoid an infrared hyperconductivity regime is proposed. In D dimension, we eventually presented some first estimates of the backreaction of the Schwinger pairs to the gravitational field, and we find a decrease of the Hubble constant due to the pair creation.

Place, publisher, year, edition, pages
2016. Vol. 94, no 10, article id 104011
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-174678DOI: 10.1103/PhysRevD.94.104011ISI: 000386897500003OAI: oai:DiVA.org:su-174678DiVA, id: diva2:1360302
Available from: 2019-10-11 Created: 2019-10-11 Last updated: 2019-10-11Bibliographically approved

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