De Sitter scalar-spinor interaction in Minkowski limit

TL;DR

This paper investigates the interaction between scalar and spinor fields in de Sitter space, analyzing how this interaction diminishes in the Minkowski (flat space) limit, suggesting a curvature-dependent origin.

Contribution

It introduces a new transformation for scalar-spinor interactions in de Sitter space and explores their behavior in the Minkowski limit, linking the interaction to space-time curvature.

Findings

Interaction vanishes in the null curvature limit.

Interaction reduces to a constant phase transformation.

Massless scalar field may be part of gravitational phenomena.

Abstract

The scalar-spinor interaction Lagrangian is presented by the Yukawa potential. In dS ambient space formalism, the interaction Lagrangian of scalar-spinor fields was obtained from a new transformation which is very similar to the guage theory. The interaction of massless minimally coupled scalar and spinor fields was investigated. The Minkowski limit of the massless minimally coupled scalar field and massive spinor field interaction in the ambient space formalism of de Sitter space time is calculated. The interaction Lagrangian and massless minimally coupled scalar field in the null curvature limit become zero and the local transformation in the null curvature limit become a constant phase transformation and the interaction in this limit become zero. The covariant derivative reduces to ordinary derivative too. Then we conclude that this interaction is due to the curvature of space time and then the massless minimally coupled scalar field may be a part of a gravitational field.