Abstract
We construct families, and concrete examples, of simple
extensions of the Standard Model that can yield ultralight real or
complex vectors or scalars with potential astrophysical
relevance. Specifically, the mass range for these putative
fundamental bosons (∼ 10-10-10-20 eV) would lead
dynamically to both new non-black hole compact objects (bosonic
stars) and new non-Kerr black holes, with masses of ∼ M⊙
to ∼ 1010 M⊙, corresponding to the mass range of
astrophysical black hole candidates (from stellar mass to
supermassive). For each model, we study the properties of the mass
spectrum and interactions after spontaneous symmetry breaking,
discuss its theoretical viability and caveats, as well as some of
its potential and most relevant phenomenological implications
linking them to the physics of compact objects.