Cosmic bubble and domain wall instabilities III: The role of oscillons in three-dimensional bubble collisions

Abstract

We study collisions between pairs of bubbles nucleated in an ambient false vacuum. For the first time, we include the effects of small initial (quantum) fluctuations around the instanton profiles describing the most likely initial bubble profile. Past studies of this problem neglect these fluctuations and work under the assumption that the collisions posess an exact SO(2,1) symmetry. We use three-dimensional lattice simulations to demonstrate that for double-well potentials, small initial perturbations to this symmetry can be amplified as the system evolves. Initially the amplification is well-described by linear perturbation theory around the SO(2,1) background, but the onset of strong nonlinearities amongst the fluctuations quickly leads to a drastic breaking of the original SO(2,1) symmetry and the production of oscillons in the collision region. We explore several single-field models, and we find it is hard to both realize inflation inside of a bubble and produce oscillons in a collision. Finally, we extend our results to a simple two-field model. The additional freedom allowed by the second field allows us to construct viable inflationary models that allow oscillon production in collisions. The breaking of the SO(2,1) symmetry allows for a new class of observational signatures from bubble collisions that do not posess azimuthal symmetry, including the production of gravitational waves which cannot be supported by an SO(2,1) spacetime.

35 pages + references, 26 figures. Submitted to JCAP. v2: Acknowledgments updates, no other changes

References in corpus (14)

• The Anthropic Landscape of String Theory
• Anisotropic Inflation from Vector Impurity
• Towards observable signatures of other bubble universes
• DEFROST: A New Code for Simulating Preheating after Inflation
• The Art of Lattice and Gravity Waves from Preheating
• Gravitational Radiation from First-Order Phase Transitions
• Towards observable signatures of other bubble universes II: Exact solutions for thin-wall bubble collisions
• Surviving the crash: assessing the aftermath of cosmic bubble collisions
• Cosmic bubble and domain wall instabilities I: parametric amplification of linear fluctuations
• Simulating the universe(s) II: phenomenology of cosmic bubble collisions in full General Relativity
• Cosmic bubble and domain wall instabilities II: Fracturing of colliding walls
• Boom and Bust Inflation: a Graceful Exit via Compact Extra Dimensions
• Gravitational waves from cosmic bubble collisions
• Detecting candidate cosmic bubble collisions with optimal filters

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