Sökning: "Inhomogeneous Cosmology"

Hittade 3 uppsatser innehållade orden Inhomogeneous Cosmology.

  1. 1. A Tension between the Early and Late Universe: Could Our Underdense Cosmic Neighbourhood Provide an Explanation?

    Master-uppsats, Uppsala universitet/Institutionen för fysik och astronomi

    Författare :Sveva Castello; [2021]
    Nyckelord :Cosmology; Hubble tension; local void;

    Sammanfattning : In recent years, the increasingly precise constraints on the value of the Hubble constant, H0, have highlighted a discrepancy between the results arising from early-time and late-time measurements. A potential solution to this so-called Hubble tension is the hypothesis that we reside in a cosmic void, i.e. LÄS MER

  3. 2. 3+1 Approach to Cosmological Perturbations : Deriving the First Order Scalar Perturbations of the Einstein Field Equations

    Kandidat-uppsats, Karlstads universitet/Fakulteten för hälsa, natur- och teknikvetenskap (from 2013)

    Författare :Söderkvist Vermelin Wilhelm; [2016]
    Nyckelord :physics; astronomy; theoretical physics; perturbation; cosmology; cosmological perturbations; 3 1 formalism; first order perturbation; perturbation theory; universe; fysik; astronomi; teoretisk fysik; störning; störningsräkning; kosmologi; kosmologiska störningar; kosmologisk störningsräkning; 3 1 formalismen; första ordningens störningar; störningsteori; universum;

    Sammanfattning : Experimental data suggest that the universe is homogeneous and isotropic on sufficiently large scales. An exact solution of the Einstein field equations exists for a homogeneous and isotropic universe, also known as a Friedmann-Lemaître-Robertson-Walker (FLRW) universe. LÄS MER

  4. 3. Supernova Cosmology in an Inhomogeneous Universe

    Master-uppsats, Fysikum; Naturvetenskapliga fakulteten

    Författare :Rahul Gupta; [2010]
    Nyckelord :Inhomogeneous Cosmology; Supernovae; Type Ia Supernova; Dark Energy; Accelerated Expansion; Accelerated Universe; Inhomogeneous Universe; Monte Carlo; Ray Tracing;

    Sammanfattning : The propagation of light beams originating from synthetic ‘Type Ia’ supernovae, through an inhomogeneous universe with simplified dynamics, is simulated using a Monte-Carlo Ray-Tracing method. The accumulated statistical (redshift-magnitude) distribution for these synthetic supernovae observations, which is illustrated in the form of a Hubble diagram, produces a luminosity profile similar to the form predicted for a Dark-Energy dominated universe. LÄS MER