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The dynamic Universe of preferred axion models

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If you have a question about this talk, please contact Luca Mantani .

I will talk about the cosmological consequences of the heavy quarks in KSVZ -type axion models. We find that their presence often causes an early matter domination phase, altering the evolution of the Universe. This extends the axion mass into the region where standard cosmology leads to overproduction, and allows for a greater number of axion models with non-renormalizable terms to be viable. This is achieved without resorting to fine-tuning of the initial misalignment angle, bolstering the motivation for many future axion haloscope experiments. Additionally, we explore how these models can be probed through measurements of the number of relativistic degrees of freedom at recombination.

This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.

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