Sökning: "FLRW models"

Hittade 4 uppsatser innehållade orden FLRW models.

  1. 1. Models of the Universe : An analysis of the asymptotic behaviour of non-linear dynamical systems

    Kandidat-uppsats, KTH/Skolan för teknikvetenskap (SCI)

    Författare :Noa Vikman; Gustav Romare; [2021]
    Nyckelord :;

    Sammanfattning : In this thesis we present some relevant theory, and then we rigorously investigate the existence intervals and the asymptotic behaviors of three cosmological models. The first model we investigate is based on the Friedmann-Lemaître-Robertson-Walker (FLRW) metric, which is consistent with the cosmological principle. LÄS MER

  3. 2. Decay of solutions to the Klein-Gordon equation on some expanding cosmological spacetimes

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

    Författare :Amol Sasane; [2019]
    Nyckelord :Klein-Gordon equation; general relativity; FLRW models; Schwarzschild-de Sitter; Reissner-Nordström-de Sitter; Physics and Astronomy;

    Sammanfattning : The decay of solutions to the Klein-Gordon equation is studied in two expanding cosmological spacetimes, namely (1) the de Sitter universe in flat Friedmann-Lemaitre-Robertson-Walker (FLRW) form, and (2) the cosmological region of the Reissner-Nordström-de Sitter (RNdS) model. Using energy methods, for initial data with finite higher order energies, bounds on the decay rates of the solution are obtained. LÄS MER

  4. 3. Simple cosmological models and their descriptions of the universe

    Kandidat-uppsats, Linköpings universitet/Matematik och tillämpad matematik

    Författare :Emil Gustafsson; [2018]
    Nyckelord :Tensors; General relativity; Einstein s field equations; Cosmology; Friedmann s equation; FLRW-spacetimes; Tensorer; Allmän relativitetsteori; Einsteins fältekvationer; Kosmologi; Friedmanns ekvation; FLRW-rumtider;

    Sammanfattning : Cosmology is the study of the universe as a whole, and attempts to describe the behaviour of the universe mathematically. The simplest relativistic cosmological models are derived from Einstein's field equations with the assumptions of isotropy and homogeneity. LÄS MER

  5. 4. Dynamics of Discrete Irregular Cosmological Models

    Master-uppsats, Stockholms universitet/Fysikum

    Författare :Shan Williams Jolin; [2014]
    Nyckelord :cosmology; discrete; irregular; simulations; dark energy; LRS curve; dynamics; Schwarzschild black holes;

    Sammanfattning : This thesis investigates the dynamics of a set of 8-600 Schwarzschild masses, randomly distributed inside cells which tessellate a 3-sphere. Furthermore the contents of each cell are mirror images of its neighbor. LÄS MER