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

Reheating after R^2 inflation proceeds through gravitational particleproduction of conformally noninvariant fields. We argue that the nonvanishingexpectation value of flat directions generic in supersymmetric theories breakconformal invariance of the fields coupled to them in a position-dependentmanner due to quantum fluctuations. As a result modulated reheating can occurafter the supergravity R^2-inflation. The resultant curvature fluctuation is amixture of the one produced during inflation and that produced by modulatedreheating. The spectral index takes a value between n_s=0.960 and 0.983, thenonlinearity parameter of the local-type non-Gaussianity can be f_nl\sim \pm10, and the tensor-to-scalar ratio is r \le 4\times 10^{-3}.

Gravitational modulated reheating and non-Gaussianity in Supergravity R^2 inflation