Leiden Repository


Type: Doctoral Thesis
Title: Oscillons
Author: Salmi, Petja Esko
Publisher: Lorenz-Institute, Faculty of Science, Leiden University
Issue Date: 2000-09-23
Keywords: Topological defects
Nontopological defects
Domain walls
Abstract: Solitons are non-dissipative, nontrivial solutions of partial differential equations. In many cases their stability is well understood, e.g. there can be topological reasons that prevent a localised lump of energy to dissolve and become dissipative. However, there are very persistent, soliton-like objects even when there is no obvious conservation law that would guarantee stability and explain longevity. This thesis considers such solutions, called oscillons, that appear in variety of nonlinear scalar theories. In essence, they are persistent oscillations of the field around the (local) minimum of the potential. A numerical study of oscillons in two spatial dimensions is presented. Use of absorbing boundary conditions in the numerical grid enables the study of radiation losses over a long period of time and permits quantitative approach to the lifetime of oscillons. Furthermore, it is shown that oscillons are emitted by collapsing domains, which way they could come into being in nature, e.g. in the conditions met in the very early Universe.
Description: Promotor: A. Achúcarro, Co-promotor: M.B. Hindmarsh
With Summary in Dutch
Faculty: Faculteit der Wiskunde en Natuurwetenschappen
Citation: Salmi, P.E., 2008, Doctoral Thesis, Leiden University
ISBN: 9789090234373
Handle: http://hdl.handle.net/1887/13117

Files in this item

Description Size View
text/html Links to published articles 6.366Kb View/Open
application/pdf Cover 58.64Kb View/Open
application/pdf Full text 3.663Mb View/Open
application/pdf Propositions 30.66Kb View/Open

This item appears in the following Collection(s)