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

We study multifield aspects of Dirac-Born-Infeld (DBI) inflation. Morespecifically, we consider an inflationary phase driven by the radial motion ofa D-brane in a conical throat and determine how the D-brane fluctuations in theangular directions can be converted into curvature perturbations when thetachyonic instability arises at the end of inflation. The simultaneous presenceof multiple fields and non-standard kinetic terms gives both local andequilateral shapes for non-Gaussianities in the bispectrum. We also study thetrispectrum, pointing out that it acquires a particular momentum dependentcomponent whose amplitude is given by $f_{NL}^{loc} f_{NL}^{eq}$. We show thatthis relation is valid in every multifield DBI model, in particular for anybrane trajectory, and thus constitutes an interesting observational signatureof such scenarios.

Combined local and equilateral non-Gaussianities from multifield DBI inflation