Kavli Affiliate: Yevgeny V. Stadnik
| First 5 Authors: Abhishek Banerjee, Itay M. Bloch, Quentin Bonnefoy, Sebastian A. R. Ellis, Gilad Perez
| Summary:
We investigate the implications of matter effects to searches for axion Dark
Matter on Earth. The finite momentum of axion Dark Matter is crucial to
elucidating the effects of Earth on both the axion Dark Matter field value and
its gradient. We find that experiments targeting axion couplings compatible
with canonical solutions of the strong CP puzzle are likely not affected by
Earth’s matter effects. However, experiments sensitive to lighter axions with
stronger couplings can be significantly affected, with a significant part of
the parameter space suffering from a reduced axion field value, and therefore
decreased experimental sensitivity. In contrast, the spatial gradient of the
axion field can be enhanced along Earth’s radial direction, with important
implications for ongoing and planned experiments searching for axion Dark
Matter.
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