Axions Facing the Large-Scale Structure

Abstract: Axion-like particles (ALP) are an interesting Dark Matter (DM) candidate, since their production mechanism, motivated from particle physics, is non-thermal. They can therefore assume very low masses while still producing the correct relic abundance. Due to their low mass they can leave observable imprints in the large-scale structure of the Universe which can be used to constrain the allowed ALP mass range. In this talk I will briefly describe the production mechanism of ALPs in the post-inflationary scenario and how they affect the large-scale distribution of matter. By confronting the theoretical predictions with CMB primary anisotropies, CMB lensing and galaxy clusters, the parameter space of ALPs, especially its mass, can be constrained. I will also highlight that the ALP model explored here fits a real feature present in the primary CMB, which is, however, not supported by galaxy clusters.

Video of Talk: www.youtube.com/watch?v=ieFmSWjIuLQ

cosmology and nongalactic astrophysicsgeneral relativity and quantum cosmology

Audience: advanced learners

( slides | video )

---

CosmoConβ - Cosmology from Home

Series comments: Cosmology from Home is an online cosmology conference. One of its features are pre-recorded talks, publicly available at its YouTube channel.

---