Kavli Affiliate: Masahito Yamazaki
| First 5 Authors: Yann Gouttenoire, Stephen F. King, Rishav Roshan, Xin Wang, Graham White
| Summary:
One of the simplest standard model extensions leading to a domain wall
network is a real scalar $S$ with a $mathcal{Z}_2$ symmetry spontaneously
broken during universe evolution. Motivated by the swampland program, we
explore the possibility that quantum gravity effects are responsible for
violation of the discrete symmetry, triggering the annihilation of the domain
wall network. We explore the resulting cosmological implications in terms of
dark radiation, dark matter, gravitational waves, primordial black holes, and
wormholes connected to baby universes.
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