Constrained Superfields in Dynamical Background

TL;DR

This paper explores how constrained superfields can be applied in dynamical cosmological backgrounds, accounting for derivative terms, to better understand supersymmetry breaking during cosmic evolution.

Contribution

It extends the use of constrained superfields to cosmological regimes by including derivative terms and analyzing supersymmetry breaking effects.

Findings

Constrained superfields remain valid during reheating and kinetic-energy dominated phases.

Derivative terms can be incorporated without neglect, broadening the applicability of superfield constraints.

Supersymmetry breaking by kinetic energy influences superfield dynamics in cosmological settings.

Abstract

We study the nonlinear realization of supersymmetry in a dynamical/cosmological background in which derivative terms like kinetic terms are finite. Starting from linearly realized theories, we integrate out heavy modes without neglecting derivative terms to obtain algebraic constraints on superfields. Thanks to the supersymmetry breaking contribution by the kinetic energy, the validity of constrained superfields can be extended to cosmological regimes and phenomena such as reheating after inflation, kinetic-energy domination, and the kinetic and standard misalignment of axion.