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The stability of particle-like solutions of some non-linear field equations
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dc.contributor.advisor | Derrick, G. H. | |
dc.contributor.author | Anderson, David Lessells Thomson | |
dc.coverage.spatial | 190 p. | en_US |
dc.date.accessioned | 2018-06-25T11:08:29Z | |
dc.date.available | 2018-06-25T11:08:29Z | |
dc.date.issued | 1969 | |
dc.identifier.uri | https://hdl.handle.net/10023/14530 | |
dc.description.abstract | The object of this thesis is to examine the stability of particle-like solutions of the nonlinear field equation ▽²Ψ - 1/c² δ²Ψ/δt² = K²Ψ –μ² ΨΨ*Ψ+λ(ΨΨ*)²Ψ with the particular form of time-dependence Ψ = φ (r) e ⁻ ˡʷᵗ Initially our interest is concentrated on the case λ = 0. We begin the analysis by finding spherically symmetric particle-like solutions, and then examining the stability of the lowest-order solution by first- order perturbation theory. Direct perturbation methods are then considered. This solution is found to be highly unstable whether it is time-independent (ω = 0) or not (ω ≠ 0). The more general case λ ≠ 0 is next discussed. Particle-like solutions are found to exist in this case for -∞ < λ (K² - w²/c²) μ⁴ < 3/16 On examining the stability of the lowest-order solutions of this generalised field equation, it is found that for correct choice of the field parameters stable time-dependent solutions can exist, some of which can also have the attractive feature that their energy density is positive definite. We conclude by considering some methods of extending the theory. | en_US |
dc.language.iso | en | en_US |
dc.publisher | University of St Andrews | |
dc.subject.lcc | QC173.A6 | |
dc.subject.lcsh | Atoms | en |
dc.title | The stability of particle-like solutions of some non-linear field equations | en_US |
dc.type | Thesis | en_US |
dc.contributor.sponsor | Carnegie Trust for the Universities of Scotland | en_US |
dc.type.qualificationlevel | Doctoral | en_US |
dc.type.qualificationname | PhD Doctor of Philosophy | en_US |
dc.publisher.institution | The University of St Andrews | en_US |
dc.publisher.department | Department of Theoretical Physics | en_US |
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