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/

Zendy Plus

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

Zendy Tools

Zendy Open

Fitting simultaneously SPX and VIX smiles is known to be one of the mostchallenging problems in volatility modeling. A long-standing conjecture due toJulien Guyon is that it may not be possible to calibrate jointly these twoquantities with a model with continuous sample-paths. We present the quadraticrough Heston model as a counterexample to this conjecture. The key idea is thecombination of rough volatility together with a price-feedback (Zumbach)effect.

The quadratic rough Heston model and the joint S&P 500/VIX smile calibration problem