• Admin
    UC Research Repository
    View Item 
       
    • UC Home
    • Library
    • UC Research Repository
    • College of Science
    • Science: Theses and Dissertations
    • View Item
       
    • UC Home
    • Library
    • UC Research Repository
    • College of Science
    • Science: Theses and Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of the RepositoryCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    Statistics

    View Usage Statistics

    Light propagation in an inhomogeneous universe.

    Thumbnail
    View/Open
    rose_thesis.pdf (5.258Mb)
    Author
    Rose, Hamish
    Date
    2002
    Permanent Link
    http://hdl.handle.net/10092/6183
    Degree Grantor
    University of Canterbury
     
    Physics
    Degree Level
    Doctoral
    Degree Name
    Doctor of Philosophy

    This thesis examines the effect of inhomogeneities on the magnitude-redshift relationship, focusing particularly on the redshift. We show that a perturbed FRW universe which has the same global behaviour as an exact FRW universe does not have the same light propagation behaviour due to the relationship between redshift and the radial coordinate being influenced by the inhomogeneities introduced. The change in redshift along a light beam depends on the rate of expansion of space so an understanding of the effect of inhomogeneities on the local rate of expansion of space is necessary in order to study the effect of inhomogeneities on redshift. We create a new description of the evolution of matter fluctuations in the weakly non-linear regime which also describes a relationship between the matter density and the local expansion rate of space. This is subsequently used in the development of a new method of calculating the relationship between the angular diameter distance and the redshift of a distant object. We use the new magnitude-redshift relationship in conjunction with the supernova data to estimate cosmological parameters and find that - to a high level of confidence Ω∆ is non-zero - most likely flat universe is one with cosmological parameters close to {Ωm) Ω∆} = {0.3, 0.7}.

    Collections
    • Science: Theses and Dissertations [3443]
    Rights
    https://canterbury.libguides.com/rights/theses

    UC Research Repository
    University Library
    University of Canterbury
    Private Bag 4800
    Christchurch 8140

    Phone
    364 2987 ext 8718

    Email
    ucresearchrepository@canterbury.ac.nz

    Follow us
    FacebookTwitterYoutube

    © University of Canterbury Library
    Send Feedback | Contact Us