publication . Preprint . Article . 2015

Cosmic bubble and domain wall instabilities II: fracturing of colliding walls

Braden, JonathanCITA, University of Toronto, 60 St. George Street, Toronto, ON, M5S 3H8, Canada; Bond, J. Richard(CITA, University of Toronto, 60 St. George Street, Toronto, ON, M5S 3H8, Canada); Mersini-Houghton, Laura(Department of Physics and Astronomy, University of North Carolina-Chapel Hill, 1 Phillips Hall, 120 E. Cameron Avenue, Chapel Hill, NC 27599-3255, U.S.A.);
Open Access English
  • Published: 26 Aug 2015
  • Publisher: The University of North Carolina at Chapel Hill University Libraries
  • Country: Italy
We study collisions between nearly planar domain walls including the effects of small initial nonplanar fluctuations. These perturbations represent the small fluctuations that must exist in a quantum treatment of the problem. In a previous paper, we demonstrated that at the linear level a subset of these fluctuations experience parametric amplification as a result of their coupling to the planar symmetric background. Here we study the full three-dimensional nonlinear dynamics using lattice simulations, including both the early time regime when the fluctuations are well described by linear perturbation theory as well as the subsequent stage of fully nonlinear evolution. We find that the nonplanar fluctuations have a dramatic effect on the overall evolution of the system. Specifically, once these fluctuations begin to interact nonlinearly the split into a planar symmetric part of the field and the nonplanar fluctuations loses its utility. At this point the colliding domain walls dissolve, with the endpoint of this being the creation of a population of oscillons in the collision region. The original (nearly) planar symmetry has been completely destroyed at this point and an accurate study of the system requires the full three-dimensional simulation.
Comment: 23 pages + references, 13 figures. Submitted to JCAP. v2: Acknowledgements updated, no other changes
free text keywords: Astronomy and Astrophysics, High Energy Physics - Theory, Astrophysics - Cosmology and Nongalactic Astrophysics, Nonlinear system, Lattice field theory, Quantum, Physics, Lattice (order), Cosmology, Planar, Mechanics, Cosmic string, Population, education.field_of_study, education
Funded by
Understanding the Origin of Cosmic Structure
  • Funder: European Commission (EC)
  • Project Code: 306478
  • Funding stream: FP7 | SP2 | ERC
  • Funder: Natural Sciences and Engineering Research Council of Canada (NSERC)
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