publication . Article . Preprint . 2016

Simulating the Universe(s) III: Observables for the full bubble collision spacetime

Matthew C. Johnson; Carroll L. Wainwright; Anthony Aguirre; Hiranya V. Peiris;
Open Access English
  • Published: 14 Jul 2016
This is the third paper in a series establishing a quantitative relation between inflationary scalar field potential landscapes and the relic perturbations left by the collision between bubbles produced during eternal inflation. We introduce a new method for computing cosmological observables from numerical relativity simulations of bubble collisions in one space and one time dimension. This method tiles comoving hypersurfaces with locally-perturbed Friedmann-Robertson-Walker coordinate patches. The method extends previous work, which was limited to the spacetime region just inside the future light cone of the collision, and allows us to explore the full bubble-collision spacetime. We validate our new methods against previous work, and present a full set of predictions for the comoving curvature perturbation and local negative spatial curvature produced by identical and non-identical bubble collisions, in single scalar field models of eternal inflation. In both collision types, there is a non-zero contribution to the spatial curvature and cosmic microwave background quadrupole. Some collisions between non-identical bubbles excite wall modes, giving extra structure to the predicted temperature anisotropies. We comment on the implications of our results for future observational searches. For non-identical bubble collisions, we also find that the surfaces of constant field can readjust in the presence of a collision to produce spatially infinite sections that become nearly homogeneous deep into the region affected by the collision. Contrary to previous assumptions, this is true even in the bubble into which the domain wall is accelerating.
Comment: 31 pages, 17 figures. Revised to match published version. Minor clarifications, conclusions unchanged
Persistent Identifiers
Sustainable Development Goals (SDG) [Beta]
arXiv: General Relativity and Quantum Cosmology
free text keywords: High Energy Physics - Theory, Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Phenomenology, Astronomy and Astrophysics, Spacetime, Light cone, Curvature, Eternal inflation, Numerical relativity, Inflation (cosmology), Physics, Cosmological perturbation theory, Classical mechanics, Scalar field
Funded by
NSF| Programs on Critical Problems in Physics, Astrophysics and Biophysics at the Aspen Center for Physics
  • Funder: National Science Foundation (NSF)
  • Project Code: 1066293
  • Funding stream: Directorate for Mathematical & Physical Sciences | Division of Physics
Understanding the Origin of Cosmic Structure
  • Funder: European Commission (EC)
  • Project Code: 306478
  • Funding stream: FP7 | SP2 | ERC
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