Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Heavy neutrino balls and the supermassive dark object at the Galactic center
Includes bibliographical references.
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
Department of Physics
2014
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613210870284288 |
|---|---|
| access_status_str | Open Access |
| author | Munyaneza, Faustin |
| author2 | Viollier, Raoul D |
| author_browse | Munyaneza, Faustin Viollier, Raoul D |
| author_facet | Viollier, Raoul D Munyaneza, Faustin |
| author_sort | Munyaneza, Faustin |
| collection | Thesis |
| description | Includes bibliographical references. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/9886 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:31.718Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2014 |
| publishDateRange | 2014 |
| publishDateSort | 2014 |
| publisher | Department of Physics |
| publisherStr | Department of Physics |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/9886 Heavy neutrino balls and the supermassive dark object at the Galactic center Munyaneza, Faustin Viollier, Raoul D Physics Includes bibliographical references. Massive neutrinos were the first proposed, and still remain the most natural, particle candidate for the dark matter. We investigate here the properties and astrophysical implications of self-gravitating degenerate heavy neutrino matter. Neutrinos of 10 to 25 keV/c² might cluster around the sun forming a halo of a few solar masses and a few light years radius. We calculate the perihelion shifts of planetary and asteroidal orbits that are expected due to the presence of a conjectured degenerate heavy neutrino halo around the sun. While the General Relativistic perihelion shifts are positive, those due to a possible dark matter halo are in general negative. A neutrino mass around ~16 keV is consistent with the observed mass excesses within the orbits of various outer planets, as obtailled from astrometrical data and Voyager 1 and 2 and Pioneer 10 and 11 ranging data. We then study the general relativistic effects on degenerate neutrino balls using the Tolman-Oppenheimer-Yolkoff (TOV ) equations of hydrostatic equilibrium. An extension of the TOV equations is made to describe the detailed properties of supermassive neutrino balls around compact objects such as white dwarfs and neutron stars. We further show that the supermassive compact dark object near Sgr A* at the Galactic center could be an extended object rather than a black hole. In fact these two scenarios can be distinguished by tracking the orbit of one of the fast moving stars near the Galactic center. VVe finally calculate the emission spectrum of the supermassive compact dark object using the standard accretion theory and show that the calculated radio wave to infrared emission spectrum between λ = 0.3 cm and λ = 10-³ cm is consistent with the observations. 2014-12-03T03:33:35Z 2014-12-03T03:33:35Z 1999 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/9886 eng application/pdf Department of Physics Faculty of Science University of Cape Town |
| spellingShingle | Physics Munyaneza, Faustin Heavy neutrino balls and the supermassive dark object at the Galactic center |
| thesis_degree_str | Doctoral |
| title | Heavy neutrino balls and the supermassive dark object at the Galactic center |
| title_full | Heavy neutrino balls and the supermassive dark object at the Galactic center |
| title_fullStr | Heavy neutrino balls and the supermassive dark object at the Galactic center |
| title_full_unstemmed | Heavy neutrino balls and the supermassive dark object at the Galactic center |
| title_short | Heavy neutrino balls and the supermassive dark object at the Galactic center |
| title_sort | heavy neutrino balls and the supermassive dark object at the galactic center |
| topic | Physics |
| url | http://hdl.handle.net/11427/9886 |
| work_keys_str_mv | AT munyanezafaustin heavyneutrinoballsandthesupermassivedarkobjectatthegalacticcenter |