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 transition between inflation and reheating, the curvature scalartypically undergoes oscillations which have significant impact on the densityof gravitationally produced particles. The commonly used adiabatic vacuumprescription for the extraction of produced particle spectra becomes anon-reliable definition of vacuum in the regimes for which this oscillatorybehavior is important. In this work, we study particle production for a scalarfield non-minimally coupled to gravity, taking into account the completedynamics of spacetime during inflation and reheating. We derive anapproximation for the solution to the mode equation during the slow-roll of theinflaton and analyze the importance of Ricci scalar oscillations in theresulting spectra. Additionally, we propose a prescription for the vacuum thatallows to safely extrapolate the result to the present, given that the testfield interacts only gravitationally. Lastly, we calculate the abundance ofdark matter this mechanism yields and compare it to observations.

Late vacuum choice and slow roll approximation in gravitational particle production during reheating