|
Résumé |
Feebly interacting particles (FIPs), such as axions, scalars, dark photons, and
majorons, are often theoretically well motivated, and a dark sector including one
or more of them can both have the aesthetic draw of solving several problems
simultaneously (like the QCD axion, an excellent DM candidate and a consequence of
the Peccei-Quinn solution to the strong CP problem), and be a valid alternative to
the weakly interacting massive particle paradigm. In this talk, I will discuss
some fresh developments in direct detection and astrophysical probes for axions
and other FIPs. In the first half of the talk, I will present the plasma
haloscope, a detection scheme that enables resonant conversion by matching the QCD
axion mass to a plasma frequency, therefore converting axions to plasmons. The
second part of the talk is dedicated to complementary searches for axions and
other FIPs through astrophysical observables. I will show that recent ideas probe
uncharted parts of the FIP parameter space, sometimes largely surpassing previous
arguments. |
