New Inflation in Waterfall Region
Niamat Ullah Khan, Nadir Ijaz, Mansoor Ur Rehman

TL;DR
This paper proposes a new class of inflation models within the waterfall region of hybrid inflation, demonstrating their compatibility with observational data and their potential for successful reheating and leptogenesis.
Contribution
It introduces a novel inflationary scenario in the waterfall region, realized within a supersymmetric tribrid framework, and evaluates its observational viability.
Findings
Predictions align with Planck data.
Model supports reheating and leptogenesis.
Includes both single-field and multi-field scenarios.
Abstract
We introduce a class of new inflation models within the waterfall region of a generalized hybrid inflation framework. The initial conditions are generated in the valley of hybrid preinflation. Both single-field and multi-field inflationary scenarios have been identified within this context. A supersymmetric realization of this scenario can successfully be achieved within the tribrid inflation framework. To assess the model's viability, we calculate the predictions of inflationary observables using the formalism, demonstrating excellent agreement with the most recent Planck data. Furthermore, this model facilitates successful reheating and nonthermal leptogenesis, with the matter-field component of the inflaton identified as a sneutrino.
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Taxonomy
TopicsCosmology and Gravitation Theories · Geophysics and Gravity Measurements · Black Holes and Theoretical Physics
