Back to Search
Start Over
Lower bound on the radii of light rings in traceless black-hole spacetimes.
- Source :
- Journal of High Energy Physics; Dec2023, Vol. 2023 Issue 12, p1-9, 9p
- Publication Year :
- 2023
-
Abstract
- Photonspheres, curved hypersurfaces on which massless particles can perform closed geodesic motions around highly compact objects, are an integral part of generic black-hole spacetimes. In the present compact paper we prove, using analytical techniques, that the innermost light rings of spherically symmetric hairy black-hole spacetimes whose external matter fields are characterized by a traceless energy-momentum tensor cannot be located arbitrarily close to the central black hole. In particular, we reveal the physically interesting fact that the non-linearly coupled Einstein-matter field equations set the lower bound r γ ≥ 6 5 r H on the radii of traceless black-hole photonspheres, where r<subscript>H</subscript> is the radius of the outermost black-hole horizon. [ABSTRACT FROM AUTHOR]
- Subjects :
- GEODESIC motion
HYPERSURFACES
Subjects
Details
- Language :
- English
- ISSN :
- 11266708
- Volume :
- 2023
- Issue :
- 12
- Database :
- Complementary Index
- Journal :
- Journal of High Energy Physics
- Publication Type :
- Academic Journal
- Accession number :
- 174834764
- Full Text :
- https://doi.org/10.1007/JHEP12(2023)178