| Athens/Institutional login |
|
| 
| 
|
|
|
|
|||
| Journals Home | Journals List | EJs Extra | This Journal | Search | Authors | Referees | Librarians | User Options | Help | | ||||
|
||||
|
|
| | |
|
||||
2000 Class. Quantum Grav. 17 123-144 doi: 10.1088/0264-9381/17/1/309
 |
 |
 |
||
|
||||
 |
|
 |
Abstract. The apparent shapes of various Kerr-Newman spacetimes are plotted. For this purpose the geometry of closed photon orbits is studied, forming a subset of the bifurcation set A 4 , well known in elementary catastrophe theory. One additional result is that the cosmic censorship hypothesis guarantees that the spacetime casts a shadow, whereas naked ring singularities enable the visibility of the `anti-world' of negative radii r through its interior. Moreover, the optical restrictions to the observability of the shadow of an astronomical black hole are inferred.
PACS numbers: 0470, 9760L, 0420, 1180F
Print publication: Issue 1 (7 January 2000) |
Post to CiteUlike | | Post to Connotea | | Post to Bibsonomy |
|
|
|
|
| | |
|
|
|
|
|
|
Journals Home | Journals List | EJs Extra | This Journal | Search | Authors | Referees | Librarians | User Options | Help | Recommend this journal EndNote, ProCite ® and Reference Manager ® are registered trademarks of ISI Researchsoft. Copyright © Institute of Physics and IOP Publishing Limited 2009. Use of this service is subject to compliance with the Terms and Conditions of use. In particular, reselling and systematic downloading of files is prohibited. Help: Cookies | Data Protection. Privacy policy Disclaimer |
|
| |
