Sökning: "cosmological parameters"

Visar resultat 1 - 5 av 14 avhandlingar innehållade orden cosmological parameters.

  1. 1. Observations of distant supernovae and cosmological implications

    Författare :Rahman Amanullah; Ariel Goobar; Adam Riess; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; cosmological parameters; cosmology; astro physics; supernovae; type Ia supernova; Cosmology; Kosmologi;

    Sammanfattning : Type Ia supernovae can be used as distance indicators for probing the expansion history of the Universe. The method has proved to be an efficient tool in cosmology and played a decisive role in the discovery of a yet unknown energy form, dark energy, that drives the accelerated expansion of the Universe. LÄS MER

  3. 2. Weigh them all! : Cosmological searches for the neutrino mass scale and mass ordering

    Författare :Sunny Vagnozzi; Katherine Freese; Lars Bergström; Alessandra Silvestri; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; neutrinos; neutrino mass; neutrino mass ordering; cosmology; cosmic microwave background; large-scale structure; galaxy surveys; dark energy; cosmic inflation; data analysis; teoretisk fysik; Theoretical Physics;

    Sammanfattning : The elusive neutrinos are among the most intriguing constituents of the particle zoo. The observation of neutrino flavour oscillations, indicating that neutrinos are massive, provides the only direct evidence for physics beyond the Standard Model. LÄS MER

  4. 3. Effects of the Higgs field on Inflation and Reheating

    Författare :Aliki Litsa; Katherine Freese; Jens Jasche; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; inflation; reheating; Higgs; non-gaussianity; cosmological perturbations; Theoretical Physics; teoretisk fysik;

    Sammanfattning : The model of inflation - a period of accelerated expansion in the very early Universe - was introduced to give solutions to a number of problems encountered in the Standard Big Bang paradigm. Additionally, due to its quantum nature, inflation is able to generate the necessary primordial inhomogeneity “seeds”, which eventually evolve into large-scale structures. LÄS MER

  5. 4. The supernova cosmology cookbook: Bayesian numerical recipes

    Författare :Natallia V. Karpenka; Joakim Edsjö; Masao Sako; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Theoretical Physics; teoretisk fysik;

    Sammanfattning : Theoretical and observational cosmology have enjoyed a number of significant successes over the last two decades. Cosmic microwave background measurements from the Wilkinson Microwave Anisotropy Probe and Planck, together with large-scale structure and supernova (SN) searches, have put very tight constraints on cosmological parameters. LÄS MER

  7. 5. From Metric to Connection. Actions for Gravity, with Generalizations

    Författare :Peter Peldan; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The search for a theory of quantum gravity has for a long time been almost fruitless. A few years ago, however, Ashtekar found a reformulation of Hamiltonian gravity, which thereafter has given rise to a new promising quantization project; the canonical Dirac quantization of Einstein gravity in terms of Ashtekar's new variables. LÄS MER