Sökning: "Cosmic expansion"
Visar resultat 1 - 5 av 9 uppsatser innehållade orden Cosmic expansion.
1. The Inflationary Universe
Kandidat-uppsats, Uppsala universitet/Teoretisk fysikSammanfattning : Astrophysical observations of the cosmic microwave background point to inconsistencies in the standard model of cosmology, and a primordial accelerated expansion of the universe known as inflation has been suggested as a solution. Unfortunately, observational evidence of inflation is lacking, and there exists hundreds of models that populate the inflationary landscape. LÄS MER
2. Quantum Gauge Fields in Cosmology: Cosmic Inflation and Gravitational Waves
Kandidat-uppsats, Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisationSammanfattning : In this thesis, the consequences of introducing Yang-Mills fields into cosmology are investigated. This is done by the effective action approach, in which the coupling constant is allowed to depend on the quantum fields. LÄS MER
3. Galaxies as Clocks and the Universal Expansion
Master-uppsats, KTH/FysikSammanfattning : The Hubble parameter H(z) is a measure of the expansion rate of the universe at redshift z. One method to determine it relies on inferring the slope of the redshift with respect to cosmic time, where galaxy ages can be used as a proxy for the latter. This method is used by Simon et al. LÄS MER
4. Primordial Gravitational Waves and ultra-light Dark Matter in a complex singlet extended Standard Model
Kandidat-uppsats, Lunds universitet/Partikel- och kärnfysik; Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisationSammanfattning : In this thesis, the consequences of extending the internal symmetries of the standard model with a complex singlet scalar field, are investigated in terms of dark matter phenomenology and the possibility of primordial gravitational wave detection utilizing space based laser interferometry. The scalar potential of the model is constructed with a Z2 symmetry, which allows for the retainment of a linear and a quadratic coupling parameter, as well as a stable dark matter candidate, and an additional non-zero vacuum expectation value for the real component of the scalar field. LÄS MER
5. Foundation for an analysis of the dust of theNearby Universe
L3-uppsats, Uppsala universitet/Institutionen för fysik och astronomiSammanfattning : The current cosmological paradigm of an accelerating cosmic expansion issupported by observations of Type Ia supernovae. However, the light emittedby these and other cosmological sources is not only redshifted by cosmicexpansion but will also interact with matter along the light path. LÄS MER