# Primordial perturbations generated by Higgs field and $R^2$ operator

## TL;DR

This paper explores a cosmological model where the early Universe's inflation is driven by a combination of a non-minimally coupled Higgs field and an $R^2$ term, analyzing its dynamics and observational constraints.

## Contribution

It introduces a combined Higgs and $R^2$ inflation model, studying its potential landscape, dynamics, and observational viability.

## Key findings

- Inflationary trajectory resembles a valley in the potential landscape.
- Model parameters are constrained by observational data.
- Isocurvature perturbations are evaluated within this framework.

## Abstract

If the very early Universe is dominated by the non-minimally coupled Higgs field and Starobinsky's curvature-squared term together, the potential diagram would mimic the landscape of a valley, serving as a cosmological attractor. The inflationary dynamics along this valley is studied, model parameters are constrained against observational data, and the isocurvature perturbation is evaluated.