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Visar resultat 11 - 15 av 25 uppsatser som matchar ovanstående sökkriterier.

1. 11. Stellar Encounters at the Galactic Centre

   Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

   Författare :Roberts Fisers; [2022]
   Nyckelord :Galaxy; encounter; SPH; NSC; Physics and Astronomy;

   Sammanfattning : Using methods of smoothed particle hydrodynamics (SPH) an N -body simulation was set-up to investigate stellar encounters between a 1 solar-mass main sequence (MS) star, modeled after the Sun, and a 0.6 solar-mass white dwarf (WD). This was done primarily to investigate the assumptions made by Mastrobuono-Battisti et al. LÄS MER

3. 12. The retention of black holes in globular clusters

   Master-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation; Lunds universitet/Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation

   Författare :Wuxueman Liu; [2021]
   Nyckelord :Physics and Astronomy;

   Sammanfattning : We simulate the velocities of formed Black Holes to determine the fraction of retained Black Holes in 152 Globular Clusters. The model we used for the escape velocity is from Plummer. The scenarios of the natal kick are Neutronstar like kicks and momentum conserving kicks. LÄS MER

4. 13. Observing stellar streams made in a supercomputer

   Kandidat-uppsats, Lunds universitet/Astronomi - Genomgår omorganisation

   Författare :Erik Fridén; [2021]
   Nyckelord :Physics and Astronomy;

   Sammanfattning : Stellar streams are made of stars that originate from globular clusters or dwarf satellite galaxies that have been disturbed by the gravitational pull from the galaxy they orbit. These stellar streams hold information about the history of the progenitor as well as information about the gravitational potential of the host galaxy. LÄS MER

5. 14. Dark Matter – Direct Detection and Capture in the Sun

   Master-uppsats, KTH/Fysik

   Författare :Erika Lind; [2020]
   Nyckelord :Dark matter; direct detection; indirect detection; solar capture; inelastic dark matter; Mörk materia; direkt detektion; indirekt detektion; solinfångning; inelastisk mörk materia;

   Sammanfattning : Dark matter has been inferred from various observations such as in galaxy clusters, flat galactic rotation curves, gravitational lensing measurements and the cosmic microwave background. Despite overwhelming observational evidence and ongoing searches, a clear signal of dark matter has not yet been detected. LÄS MER

7. 15. The Largest Void and Cluster in Non-Standard Cosmology

   L3-uppsats, Uppsala universitet/Teoretisk astrofysik

   Författare :Sveva Castello; [2020]
   Nyckelord :Cosmology; f R gravity; galaxy clusters; cosmic voids; extreme value statistics;

   Sammanfattning : We employ observational data about the largest cosmic void and most massive galaxy cluster known to date, the 'Cold Spot' void and the 'El Gordo' cluster, in order to constrain the parameter |fR0| from the f(R) gravity formulation by Hu and Sawicki and the matter power spectrum normalization at present time, σ8. We obtain the marginalized posterior distribution for these two parameters through a Markov Chain Monte Carlo analysis, where the likelihood function is modeled through extreme value statistics. LÄS MER