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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Several models of inflection point inflation with the volume modulus as theinflaton are investigated. Non-perturbative superpotentials containing twogaugino condensation terms or one such term with threshold corrections areconsidered. It is shown that the gravitino mass may be much smaller than theHubble scale during inflation if at least one of the non-perturbative terms hasa positive exponent. Higher order corrections to the Kahler potential have tobe taken into account in such models. Those corrections are used to stabilizethe potential in the axion direction in the vicinity of the inflection point.Models with only negative exponents require uplifting and in consequence havethe supersymmetry breaking scale higher than the inflation scale. Fine-tuningof parameters and initial conditions is analyzed in some detail for both typesof models. It is found that fine-tuning of parameters in models with heavygravitino is much stronger than in models with light gravitino. It is shownthat recently proposed time dependent potentials can provide a solution to theproblem of the initial conditions only in models with heavy gravitino. Suchpotentials can not be used to relax fine tuning of parameters in any modelbecause this would lead to values of the spectral index well outside theexperimental bounds.

Volume modulus inflection point inflation and the gravitino mass problem