# Secluded and Putative Flipped Dark Matter and Stueckelberg Extensions of the Standard Model

## TL;DR

This paper explores three models of dark matter involving an extra U(1)_D gauge symmetry, where dark fermions and vector bosons acquire mass via the Stueckelberg mechanism, resulting in particles compatible with experimental and astrophysical constraints.

## Contribution

It introduces three new dark matter models with Stueckelberg mass generation, including flipped and secluded scenarios, and demonstrates their compatibility with current constraints.

## Key findings

- Models produce ALIPs compatible with experiments
- Flipped models evolve into secluded configurations
- Dark fermions and vectors satisfy astrophysical bounds

## Abstract

We consider here three dark matter models with the gauge symmetry of the standard model plus an additional local $U(1)_D$ factor. One model is truly secluded and the other two models begin flipped, but end up secluded. All of these models include one dark fermion and one vector boson that gains mass via the Stueckelberg mechanism. We show that the would be flipped models provide an example dark matter composed of "almost least interacting particles" (ALIPs). Such particles are therefore compatible with the constraints obtained from both laboratory measurements and astrophysical observations.