Sökning: "cosmological measurements"

Visar resultat 6 - 10 av 10 uppsatser innehållade orden cosmological measurements.

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

   L3-uppsats, Uppsala universitet/Institutionen för fysik och astronomi

   Författare :Jimmy Kjellqvist; [2021]
   Nyckelord :Intergalacitc dust; dust distribution; cosmology; cosmological measurements; quasars;

   Sammanfattning : 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

3. 7. A Machine Learning Approach for Comprehending Cosmic Expansion

   Master-uppsats, KTH/Fysik

   Författare :Ludvig Doeser; [2021]
   Nyckelord :Cosmology; Cosmic expansion; Galaxy Images; Machine learning; Kosmologi; kosmisk expansion; galaxbilder; maskininlärning;

   Sammanfattning : This thesis aims at using novel machine learning techniques to test the dynamics of the Universe via the cosmological redshift-distance test. Currently, one of the most outstanding questions in cosmology is the physical cause of the accelerating cosmic expansion observed with supernovae. LÄS MER

4. 8. 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

5. 9. Chi-Squared Analysis of Measurements of Two Cosmological Parameters Over Time

   Master-uppsats, Uppsala universitet/Observationell astrofysik

   Författare :Timothy Faerber; [2019]
   Nyckelord :Cosmology Chi Squared Hubble Constant Amplitude of Mass Fluctuations Statistical Analysis;

   Sammanfattning : For this project, a historical statistical analysis of the Amplitude of Mass Fluctuations ($\sigma_8$) and Hubble's Constant ($H_0$) parameters in the Standard Cosmological Model was carried out to determine whether or not the given error bars truly represent the dispersion of values. It was found through analysis of the Chi-Squared ($\chi^2$) values of the data that for $\sigma_8$ (60 data points and $\chi^2$ between 183. LÄS MER

7. 10. Aspects of spatially homogeneous and isotropic cosmology

   Kandidat-uppsats, Fakulteten för teknik- och naturvetenskap

   Författare :Mikael Isaksson; [2011]
   Nyckelord :Cosmology; Spatially; homogeneous; isotropic; universe; Friedmann-Lemaître; Einstein s field equation; Robertson-Walker;

   Sammanfattning : In this thesis, after a general introduction, we first review some differential geometry to provide the mathematical background needed to derive the key equations in cosmology. Then we consider the Robertson-Walker geometry and its relationship to cosmography, i.e., how one makes measurements in cosmology. LÄS MER