# Novel cosmological bounds on thermally-produced axion-like particles

@article{Caloni2022NovelCB, title={Novel cosmological bounds on thermally-produced axion-like particles}, author={Luca Caloni and Martina Gerbino and Massimiliano Lattanzi and Luca Visinelli}, journal={Journal of Cosmology and Astroparticle Physics}, year={2022}, volume={2022} }

We constrain the coupling of thermally-produced axion-like particles (here axions) with photons and gluons, using data from the cosmic microwave background (CMB) spectra and baryon acoustic oscillations. The axion possesses an explicit soft breaking mass term and it is produced thermally in the early Universe from either axion-photon or axion-gluon processes, accounting for the recent progresses in the field. We derive the most stringent bounds on the axion-gluon coupling to date on the mass…

## 5 Citations

### Ruling out light axions: the writing is on the wall

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We revisit the domain wall problem for QCD axion models with more than one quark charged under the Peccei-Quinn symmetry. Symmetry breaking during or after inﬂation results in the formation of a…

### Axion-pion chiral Lagrangian at NLO

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We discuss the construction of the two-flavour axion-pion effective Lagrangian at the next-to-leading order (NLO) in chiral perturbation theory and present two phenomenological applications: the…

### Dark Radiation Constraints on Heavy QCD Axions

- Physics
- 2022

: The naturalness problem of PQ symmetry motivates study of the heavy QCD axion, with masses m a > 1 MeV generated at scales above the QCD scale, and low values of the PQ symmetry breaking scale, f a…

### Cosmological bound on the QCD axion mass, redux

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We revisit the joint constraints in the mixed hot dark matter scenario in which both thermally produced QCD axions and relic neutrinos are present. Upon recomputing the cosmological axion abundance…

### Constraints on ultralight axions, vector gauge bosons, and unparticles from geodetic and frame-dragging measurements

- PhysicsThe European Physical Journal C
- 2022

The geodetic and frame-dragging effects are the direct consequences of the spacetime curvature near Earth which can be probed from the Gravity probe B (GP-B) satellite. The satellite result matches…

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