3 papers
astro-ph.CO2024
Improved model of large-field inflation with primordial black hole production in Starobinsky-like supergravity
Ryotaro Ishikawa, Sergei V. Ketov
A viable model of large-field (chaotic) inflation with efficient production of primordial black holes is proposed in Starobinsky-like (modified) supergravity leading to the "no-sca…
hep-th2019
Gravitino condensate in supergravity coupled to the supersymmetric Born-Infeld theory
Ryotaro Ishikawa, Sergei V. Ketov
The supersymmetric Born-Infeld theory coupled to supergravity in four spacetime dimensions is studied in the presence of a cosmological term with spontaneous supersymme…
hep-th2018
Beyond Starobinsky inflation
Yermek Aldabergenov, Ryotaro Ishikawa, Sergei V. Ketov +1
A supergravity extension of the gravity with the additional (Born-Infeld) structure of a massive vector multiplet gives rise to the specific gravity, whose structu…