Supermassive boson star at the galactic center? art. no. 104012

Citation
Df. Torres et al., Supermassive boson star at the galactic center? art. no. 104012, PHYS REV D, 6210(10), 2000, pp. 4012
Citations number
75
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW D
ISSN journal
0556-2821 → ACNP
Volume
6210
Issue
10
Year of publication
2000
Database
ISI
SICI code
0556-2821(20001115)6210:10<4012:SBSATG>2.0.ZU;2-4
Abstract
We explore whether supermassive nonbaryonic stars (in particular boson, min iboson, and nontopological soliton stars) might be at the center of some ga laxies, with special attention to the Milky Way. We analyze, from a dynamic al point of view, what current observational data show, concluding that the y are compatible with a single supermassive object without requiring it to be a black hole. Particularly, we show that scalar stars fit very well into these dynamical requirements. The parameters of different models of scalar stars necessary to reproduce the inferred central mass are derived, and th e possible existence of boson particles with the adequate range of masses i s commented upon. Accretion to boson stars is also briefly analyzed, and a comparison with another nonbaryonic candidate, a massive neutrino ball, whi ch is also claimed as an alternative to the central black hole, is given. B oth models are capable of explaining the nature of the object in Sgr A* wit hout invoking the presence of a singularity. One difficult issue is why the accreted materials will not finally produce, in a sufficiently long time, a black hole. We provide an answer based on stellar disruption in the case of boson stars, and comment on several suggestions for its possible solutio n in neutrino ball scenarios. Finally, we discuss the prospects for the obs ervational detection of these supermassive scalar objects, using the new ge neration of x-ray and radio interferometry satellites.