Ulm 2004 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
GR: Gravitation und Relativitätstheorie
GR 3: Klassische Gravitationstheorie, Schwarze Löcher, Astrophysik
GR 3.4: Fachvortrag
Mittwoch, 17. März 2004, 15:20–15:40, H20
Gravitating monopoles in de Sitter/Anti-de Sitter space-time — •Betti Hartmann1, Yves Brihaye2, and Bruno Bertrand2 — 1School of Engineering and Sciences, International University Bremen (IUB), 28275 Bremen — 2Faculté des Sciences, Université de Mons, 7000 Mons, Belgien
This talk deals with gravitating monopoles in asymptotic de Sitter/Anti-de Sitter space-time. First, I will talk about global monopole solutions in (3+1) space-time dimensions. Contrary to another recent publication, it was found in [1] that the inclusion of a cosmological constant can not render the mass of the global monopole positive.
In the second part of the talk, I will focus on solutions of a five-dimensional Einstein-Yang-Mills model with non-vanishing cosmological constant [2]. Assuming all fields to be independent of the extra coordinate, a dimensional reduction leads to an effective (3+1) dimensional Einstein-Yang-Mills-Higgs dilaton model where the cosmological constant induces a Liouville potential in the dilaton field. Analytic and numerical solutions of the equations are presented.
[1] B. Bertrand, Y. Brihaye and B. Hartmann, Class. Quant. Grav. 20 (2003), 4495-4502. [hep-th/0304026]
[2] B. Hartmann, Y. Brihaye and B. Bertrand, Phys. Lett. B570 (2003), 137-144. [hep-th/0307065]