# How robust is the QCD axion? A systematic study in a non-minimal model

- Institution: CERN
- Speaker: Fuensanta Viches Bravo
- Year: 2026
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3020975)
- Licence: [CERN](https://copyright.web.cern)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

The axion is one of the most compelling candidates for physics beyond the Standard Model, as it simultaneously provides a solution to the strong CP problem and a viable dark matter candidate. In post-inflationary scenarios, the minimal QCD axion model leads to strong constraints on the axion mass from the dark matter relic abundance. Specific quantization relations hold for the axion-gauge couplings which constrain further the parameter space. In this work, we test how robust these phenomenological features are in multiple-axion scenarios. Considering a two-axion framework, we explore whether new regions of parameter space remain theoretically and phenomenologically motivated.

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## Lectures

1. [How robust is the QCD axion? A systematic study in a non-minimal model](https://invisiblenetwork.ai/learn/cern/3020975/d0c841064221), 11 min (CERN's player)