TL;DR
This paper introduces a novel self-coupling in galileon theories, explores scalar geon solutions, analyzes their stability, and discusses potential observational signatures such as shock fronts.
Contribution
It proposes an additional self-coupling in galileon theories and investigates scalar geon solutions, a new class of stable, localized field configurations.
Findings
Scalar geons can exist as stable solutions.
Self-coupling affects the properties of galileon fields.
Potential signatures include shock front phenomena.
Abstract
We suggest that galileon theories should have an additional self-coupling of the fields to the trace of their own energy-momentum tensor. We explore the classical features of one such model, in flat 4D spacetime, with emphasis on solutions that are scalar analogues of gravitational geons. We discuss the stability of these scalar geons, and some of their possible signatures, including shock fronts.
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