Kavli Affiliate: Masahito Yamazaki
| First 5 Authors: Stephen F. King, Rishav Roshan, Xin Wang, Graham White, Masahito Yamazaki
| Summary:
We explore how quantum gravity effects, manifested through the breaking of
discrete symmetry responsible for both Dark Matter and Domain Walls, can have
observational effects through CMB observations and gravitational waves. To
illustrate the idea we consider a simple model with two scalar fields and two
$mathcal{Z}_2$ symmetries, one being responsible for Dark Matter stability,
and the other spontaneously broken and responsible for Domain Walls, where both
symmetries are assumed to be explicitly broken by quantum gravity effects. We
show the recent gravitational wave spectrum observed by several pulsar timing
array projects can help constrain such effects.
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