Essays about: "Cosmic expansion"

Showing result 1 - 5 of 9 essays containing the words Cosmic expansion.

1. 1. The Inflationary Universe

   University essay from Uppsala universitet/Teoretisk fysik

   Author : Benjamin Cavcic; [2023]
   Keywords : general relativity; inflation; cosmology; cosmic inflation; chaotic inflation; natural inflation; eternal inflation; valley hybrid inflation;

   Abstract : 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. READ MORE

3. 2. Quantum Gauge Fields in Cosmology: Cosmic Inflation and Gravitational Waves

   University essay from Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisation

   Author : Emma Hermansson; [2022]
   Keywords : Physics and Astronomy;

   Abstract : 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. READ MORE

4. 3. Galaxies as Clocks and the Universal Expansion

   University essay from KTH/Fysik

   Author : Anders Ahlström Kjerrgren; [2021]
   Keywords : cosmology; cosmic chronometers; universal expansion; Hubble parameter; differential ages; galaxy age; relative age; cosmic time; chi-square minimization; monte carlo sampling; gaussian processes; kosmologi; kosmisk kronometer; universums expansion; Hubbleparametern; differentiell ålder; galaxålder; relativ ålder; kosmisk tid; chi-2-minimering; monte carlo-sampling; gaussiska processer;

   Abstract : 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. READ MORE

5. 4. Primordial Gravitational Waves and ultra-light Dark Matter in a complex singlet extended Standard Model

   University essay from Lunds universitet/Partikel- och kärnfysik; Lunds universitet/Teoretisk partikelfysik - Geonomgår omorganisation

   Author : Sara Wildenor; [2021]
   Keywords : theoretical physics; gravitational waves; dark matter; complex singlet extended standard model; LISA; BBO; DECIGO; Physics and Astronomy;

   Abstract : 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. READ MORE

6. 5. Foundation for an analysis of the dust of theNearby Universe

   University essay from Uppsala universitet/Institutionen för fysik och astronomi

   Author : Jimmy Kjellqvist; [2021]
   Keywords : Intergalacitc dust; dust distribution; cosmology; cosmological measurements; quasars;

   Abstract : 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. READ MORE