Search for dissertations about: "Lorentzian"

Showing result 1 - 5 of 18 swedish dissertations containing the word Lorentzian.

  2. 1. On vanishing-curvature extensions of Lorentzian metrics

    Author : Lars Alexandersson; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; projective curvature; indefinite metric; maximum principle; set-valued function; indefinite metric;

    Abstract : .... READ MORE

  4. 2. Test Charge Response of a Dusty Plasma with Grain Size Distribution and Charging Dynamics

    Author : Muhammad Shafiq; Michael A. Raadu; Jens Juul Rasmussen; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Dusty plasmas; Complex plasmas; Grain size distribution; Grain charging dynamics; Lorentzian distribution; Kappa distribution; Test charge response; Delayed shielding; Energy loss; Drag force; Wake field.; Plasma physics; Plasmafysik;

    Abstract : This doctoral thesis reports analytical and numerical results for the electrostatic response of a dusty plasma to a moving test charge. Two important physical aspects of dusty plasmas, namely grain size distribution and grain charging dynamics were taken into account. READ MORE

  5. 3. Studies on boundary values of eigenfunctions on spaces of constant negative curvature

    Author : Pierre Bäcklund; Andreas Juhl; Andreas Strömbergsson; Genkai Zhang; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Hyperbolic space; anti de Sitter space; spectral geometry; scattering theory; analysis on real and complex Lie groups; intertwining operators; Verma modules; analysis on homogeneous spaces; conformal differential geometry; Selberg zeta functions; Algebra; geometry and mathematical analysis; Algebra; geometri och analys;

    Abstract : This thesis consists of two papers on the spectral geometry of locally symmetric spaces of Riemannian and Lorentzian signature. Both works are concerned with the idea of relating analysis on such spaces to structures on their boundaries.The first paper is motivated by a conjecture of Patterson on the Selberg zeta function of Kleinian groups. READ MORE

  6. 4. Aspects of extra dimensions and membranes

    Author : Martin Sundin; Edwin Langmann; Teresia Månsson; Fawad Hassan; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Extra dimensions; Brane world scenarios; Supermembranes; Mathematical physics; Matematisk fysik;

    Abstract : This thesis is about thwo papers related to extra dimensions. Paper A discusses extrinsic curvature effects, and paper B treats symmetries of supersymmetric membranes. In the part of this thesis related to paper A, we extend the theory of non-relativistic quantum particles confined to submanifolds to relativistic boson fields. READ MORE

  7. 5. Superinductance and fluctuating two-level systems: Loss and noise in disordered and non-disordered superconducting quantum devices

    Author : David Niepce; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Disordered Superconductors; Nanowire; Superinductor; Quantum information; Superconducting circuits; Superinductance; TLS; Two-level Systems;

    Abstract : In this thesis, we first demonstrate that a disordered superconductor with high kinetic inductance can realise a microwave low-loss, non-dissipative circuit element with impedance greater than the quantum resistance. This element, known as a superinductor, can suppress the fluctuations of charge in a quantum circuit. READ MORE