On Scherk-Schwarz mechanism in gauged five-dimensional supergravity and on its relation to bigravity

TL;DR

This paper explores the connection between the Scherk-Schwarz mechanism and flipped gauged supergravities in five dimensions, analyzing supersymmetry breaking and its implications for bigravity models.

Contribution

It clarifies the relation between Scherk-Schwarz supersymmetry breaking and flipped super-bigravity, and distinguishes brane-induced breaking from Scherk-Schwarz type.

Findings

Scherk-Schwarz terms in supergravity are characterized and analyzed.

Brane-induced supersymmetry breaking in 5d Horava-Witten model is not of Scherk-Schwarz type.

Detailed discussion of flipped super-bigravity as an extension of bigravity models.

Abstract

We demonstrate the relation between the Scherk-Schwarz mechanism and flipped gauged brane-bulk supergravities in five dimensions. We discuss the form of supersymmetry violating Scherk-Schwarz terms in pure supergravity and in supergravity coupled to matter. We point out that brane-induced supersymmetry breakdown in 5d Horava-Witten model is not of the Scherk-Schwarz type. We discuss in detail flipped super-bigravity, which is the locally supersymmetric extension of the (++) bigravity.