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http://hdl.handle.net/10773/18986
Title: | Asymptotically flat scalar, Dirac and Proca stars: Discrete vs. continuous families of solutions |
Author: | Herdeiro, C. A. R. Pombo, A. M. Radu, E. |
Issue Date: | 2017 |
Publisher: | Elsevier |
Abstract: | The existence of localized, approximately stationary, lumps of the classical gravitational and electromagnetic field - geons - was conjectured more than half a century ago. If one insists on exactstationarity, topologically trivial configurations in electro-vacuum are ruled out by no-go theorems for solitons. But stationary, asymptotically flat geons found a realization in scalar-vacuum, where everywhere non-singular, localized field lumps exist, known as (scalar) boson stars. Similar geons have subsequently been found in Einstein-Dirac theory and, more recently, in Einstein-Proca theory. We identify the common conditions that allow these solutions, which may also exist for other spin fields. Moreover, we present a comparison of spherically symmetric geons for the spin 0, 1/2 and 1, emphasizingthe mathematical similarities and clarifying the physical differences, particularly between the bosonic and fermioniccases. We clarify that for the fermionic case, Pauli's exclusion principle prevents a continuous family of solutions for a fixed field mass; rather only a discrete set exists, in contrast with the bosonic case. (C) 2017 The Authors. Published by Elsevier B.V. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/18986 |
DOI: | 10.1016/j.physletb.2017.09.036 |
ISSN: | 0370-2693 |
Appears in Collections: | CIDMA - Artigos DFis - Artigos GGDG - Artigos |
Files in This Item:
File | Description | Size | Format | |
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PLB773(2017)654.pdf | 833.12 kB | Adobe PDF | View/Open |
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