6533b824fe1ef96bd12800cf
RESEARCH PRODUCT
PBH assisted search for QCD axion dark matter
Gongjun ChoiEnrico D. Schiappacassesubject
Astrophysics and AstronomyCosmology and Nongalactic Astrophysics (astro-ph.CO)axionsAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical sciencesmustat aukotAstrophysics::Cosmology and Extragalactic Astrophysicshiukkasfysiikkakosmologianeutron starspimeä aineHigh Energy Physics - Phenomenology (hep-ph)neutronitähdetParticle Physics - PhenomenologyHigh Energy Astrophysical Phenomena (astro-ph.HE)astro-ph.HEdark matter experimentsHigh Energy Physics::Phenomenologyprimordial black holesAstronomy and Astrophysicshep-phHigh Energy Physics - Phenomenologyastro-ph.COkvanttiväridynamiikkaHigh Energy Physics::ExperimentAstrophysics - High Energy Astrophysical PhenomenaAstrophysics - Cosmology and Nongalactic Astrophysicsdescription
The entropy production prior to BBN era is one of ways to prevent QCD axion with the decay constant $F_{a}\in[10^{12}{\rm GeV},10^{16}{\rm GeV}]$ from overclosing the universe when the misalignment angle is $\theta_{\rm i}=\mathcal{O}(1)$. As such, it is necessarily accompanied by an early matter-dominated era (EMD) provided the entropy production is achieved via the decay of a heavy particle. In this work, we consider the possibility of formation of primordial black holes during the EMD era with the assumption of the enhanced primordial scalar perturbation on small scales ($k>10^{4}{\rm Mpc}^{-1}$). In such a scenario, it is expected that PBHs with axion halo accretion develop to ultracompact minihalos (UCMHs). We study how UCMHs so obtained could be of great use in the experimental search for QCD axion dark matter with $F_{a}\in[10^{12}{\rm GeV},10^{16}{\rm GeV}]$.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2022-05-04 |