Sökning: "singularity expansion"
Visar resultat 1 - 5 av 6 avhandlingar innehållade orden singularity expansion.
1. Elastic Wave Scattering by Closed Cracks and Thin Flaws - Multiple Scattering and Resonances
Sammanfattning : In this thesis we study elastic wave scattering by thin flaws and closed cracks, which finds applications in ultrasonic testing and evaluation of materials. First we consider the scattering of an SH-wave by a thin finite elastic layer between two elastic half-spaces. LÄS MER
2. Singular Fluxes in Ten and Eleven Dimensions : Sources, Singularities, Fluxes and Spam
Sammanfattning : The energy content of our present universe is dominated by the dark-energy, or vacuum energy, which provides accelerated cosmic expansion. Dark energy has a possible effective explanation through a positive cosmological constant. LÄS MER
3. On various aspects of extended objects
Sammanfattning : This thesis concerns classical and quantum aspects of minimal manifolds embedded in flat Minkowski space. In particular, we study the Lie algebra of diffeomorphisms on 2 dimensional compact manifolds as well as discuss singularity formation for relativistic minimal surfaces in co-dimension one. LÄS MER
4. Quiescent regimes in cosmology
Sammanfattning : This thesis is about cosmological solutions to Einstein’s equations of general relativity, in particular spacetimes whose mean curvature diverges. Moreover, we consider anisotropic spacetimes with big bang singularities. In this setting the singularity is expected to generically be oscillatory if no matter is present. LÄS MER
5. Strong Cosmic Censorship and Cosmic No-Hair in spacetimes with symmetries
Sammanfattning : This thesis consists of three articles investigating the asymptotic behaviour of cosmological spacetimes with symmetries arising in Mathematical General Relativity.In Paper A and B, we consider spacetimes with Bianchi symmetry and where the matter model is that of a perfect fluid. LÄS MER