Double Inflation in Supergravity and the Large Scale Structure

TL;DR

This paper explores a double inflation model in supergravity, analyzing its effects on cosmic structure formation and how future CMB measurements can constrain its parameters.

Contribution

It introduces a double inflation scenario with hybrid and new inflations in supergravity, linking inflation dynamics to observable large-scale structure.

Findings

Both inflation types can produce relevant density fluctuations under certain conditions.

Galaxy and cluster data impose strong constraints on model parameters.

Future CMB experiments will refine parameter estimates.

Abstract

The cosmological implication of a double inflation model with hybrid + new inflations in supergravity is studied. The hybrid inflation drives an inflaton for new inflation close to the origin through supergravity effects and new inflation naturally occurs. If the total e-fold number of new inflation is smaller than $\sim 60$, both inflations produce cosmologically relevant density fluctuations. Both cluster abundances and galaxy distributions provide strong constraints on the parameters in the double inflation model assuming $\Omega_0=1$ standard cold dark matter scenario. The future satellite experiments to measure the angular power spectrum of the cosmic microwave background will make a precise determination of the model parameters possible.