De Sitter scalar–spinor interaction in Minkowski limit

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 gauge theory. The interaction of massless minimally coupled (mmc) scalar and spinor fields was investigated. The Minkowski limit of the mmc scalar field and massive spinor field interaction in the ambient space formalism of de Sitter spacetime is calculated. The interaction Lagrangian and mmc 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 spacetime and then the mmc scalar field may be a part of a gravitational field.

Interaction of massless minimally coupled scalar field with spinor field in de Sitter universe

“…where A α is arbitrary constant which discussed in [23]. the mmc scalar field operator can be obtained as [21]:…”

“…The interaction of massless minimally coupled (mmc) scalar field with spinor field was investigated and scattering matrix of (Ψ + Ψ → Ψ + Ψ) studied [22]. This interaction in flat space limit was discussed and it be seen that the mmc scalar field, interaction Lagrangian and scattering matrix vanished in null curvature limit [23]. Here, following on the interaction of mmc scalar field with spinor field we investigate the interaction (Ψ + Φ m → Ψ + Φ m ) and calculate the scattering matrix and then study the behavior of this interaction in null curvature limit.…”