Standard Model from A Supergravity Model with a Naturally Small Cosmological Constant

TL;DR

This paper constructs a string-inspired 4D supergravity model that naturally yields a small cosmological constant and reproduces the standard model by incorporating supersymmetry breaking and nilpotent superfields.

Contribution

It introduces a novel supergravity framework integrating the standard model with a naturally small cosmological constant using nilpotent superfields.

Findings

Achieves a small cosmological constant consistent with observations.

Reproduces the standard model interactions without supersymmetry.

Provides a string theory motivated model with spontaneous supersymmetry breaking.

Abstract

Guided by the naturalness criterion for an exponentially small cosmological constant, we present a string theory motivated 4-dimensional $\mathcal{N}=1$ non-linear supergravity model (or its linear version with a nilpotent superfield) with spontaneous supersymmetry breaking. The model encompasses the minimal supersymmetric standard model, the racetrack K\"ahler uplift, and the KKLT anti-$\rm D3$-branes, and use the nilpotent superfield to project out the undesirable interaction terms as well as the unwanted degrees of freedom to end up with the standard model (not the supersymmetric version) of strong and electroweak interactions.