Sökning: "Metric tensor"

Visar resultat 1 - 5 av 8 uppsatser innehållade orden Metric tensor.

  1. 1. Computation of Effective Local Diffusion Tensor

    Master-uppsats, KTH/Fysik

    Författare :Viktor Pontéus; [2022]
    Nyckelord :Diffusion; Diffusion Tensor; Fokker-Planck; Coarse-graining; Extended Ensembles; Diffusion; Diffusionstensor; Fokker-Planck; Coarse-graining; Utvidgad ensemble;

    Sammanfattning : Numerical simulations of large complex systems such as biomolecules often suffer from the full description of the system having too many dimensions for direct numerical calculations and Monte Carlo methods having trouble overcoming energy barriers. It is therefore desirable to formulate a description in lower dimension which captures the system’s macroscopic behaviour. LÄS MER

  3. 2. Matter-streams as sources of the Kerr metric

    Master-uppsats, Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisation

    Författare :Julian Boy; [2022]
    Nyckelord :General Relativity; Black holes; Physics; Kerr metric; Physics and Astronomy;

    Sammanfattning : An introduction to the thin-shell formalism and distributional approach to General Relativity is provided. The formalism is utilized to investigate possible distributions of matter that can act as a source to the Kerr metric. LÄS MER

  4. 3. Unstructured mesh adaptation for turbo-machinery RANS computation

    Master-uppsats, KTH/Flygdynamik

    Författare :Marc-Antoine Bouvattier; [2017]
    Nyckelord :Metric tensor; mesh adaptation; anisotropy; projection error; turbo-machinery; unstructured mesh; Riemannian;

    Sammanfattning : This paper gives an overview of the mathematical and practical tools that can be used in turbo-machinery RANS simulation to realize unstructured mesh adaptation. It first presents the concept of metric and recalls that the hessian of the physical flow properties can become, thanks to small modifications, both a metric and a upper bound of the P1 projection error. LÄS MER

  5. 4. Matching of geometrically and topologically changing meshes

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Avdelningen för beräkningsvetenskap

    Författare :Kristoffer Jonsson; [2015]
    Nyckelord :mesh; meshes; matching; matchings; topology; geometry; manifold; compression; animation; animations; fluid; spherical harmonics; tensor; bijective; game; games; DICE;

    Sammanfattning : The aim for this thesis is to develop a foundation for a compression system for animated mesh sequences, specifically under dynamic change of mesh geometry and topology. Compression of mesh sequences is of special interest in the game industry and this particular thesis is a part of an ongoing series of projects at EA DICE. LÄS MER

  7. 5. The Square-Root Isometry of Coupled Quadratic Spaces : On the relation between vielbein and metric formulations of spin-2 interactions

    Master-uppsats, Stockholms universitet/Fysikum; Stockholms universitet/Oskar Klein-centrum för kosmopartikelfysik (OKC)

    Författare :Kocic Mikica B.; [2014]
    Nyckelord :modified gravity; bigravity; bimetric theory; square-root isometry;

    Sammanfattning : Bimetric theory is an extension to general relativity that introduces a secondary symmetric rank-two tensor field. This secondary spin-2 field is also dynamical, and to avoid the Boulware-Deser ghost issue, the interaction between the two fields is obtained through a potential that involes the matrix square-root of the tensors. LÄS MER