English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

In the present article we study the process of particle creation for Elkospinor fields as a consequence of expansion of the universe. We study theeffect driven by a expanding background that is asymptotically minkowskian inthe past and future. The differential equation that governs the time modefunction is obtained for the conformal coupling case and, although its solutionis non-analytic, within an approximation that preserves the characteristics ofthe terms that break the analyticity, analytic solutions are obtained. Thus, bymeans of the Bogolyubov transformations technique, the number density ofparticles created is obtained, which can be compared to exact solutions alreadypresent in literature for scalar and Dirac particles. The spectrum of createdparticles is obtained and it was found that it is a generalization of thescalar field case, which converges to the scalar field one when the specificterms concerning the Elko field are dropped out. We also found that lighterElko particles are created in larger quantities than Dirac fermionic particles.By considering the Elko particles as candidate to dark matter in the universe,such result shows that there are more light dark matter (Elko) particlescreated by gravitational effects in the universe than baryonic (fermionic)matter, in agreement to standard model.

Creation of Elko particles in asymptotically expanding universe