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Signature of anisotropic bubble collisions

2010; American Physical Society; Volume: 82; Issue: 6 Linguagem: Inglês

10.1103/physrevd.82.063530

1550-7998

Michael P. Salem,

Solar and Space Plasma Dynamics

Our universe may have formed via bubble nucleation in an eternally-inflating background. Furthermore, the background may have a compact dimension---the modulus of which tunnels out of a metastable minimum during bubble nucleation---which subsequently grows to become one of our three large spatial dimensions. When in this scenario our bubble universe collides with other ones like it, the collision geometry is constrained by the reduced symmetry of the tunneling instanton. While the regions affected by such bubble collisions still appear (to leading order) as disks in an observer's sky, the centers of these disks all lie on a single great circle, providing a distinct signature of anisotropic bubble nucleation.