Light ring and the appearance of matter accreted by black holes
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Documents
- PhysRevD.103.104044
Final published version, 2.3 MB, PDF document
The geometry of black hole spacetimes can be probed with exquisite precision in the gravitational-wave window, and possibly also in the optical regime. We study the accretion of bright spots-objects which emit strongly in the optical or in gravitational waves-by nonspinning black holes. As the object approaches the event horizon, the emitted radiation to far-away distances is dominated by photons or gravitons orbiting the light ring, causing the total luminosity to decrease exponentially as L-o similar to e(-t/(3 root 3M)). Late-time radiation is blueshifted, due to its having been emitted during the infall, trapped at the light ring and subsequently reemitted. These universal properties are a clear signature of the existence of light rings in the spacetime, and not particularly sensitive to near horizon details.
Original language | English |
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Article number | 104044 |
Journal | Physical Review D |
Volume | 103 |
Issue number | 10 |
Number of pages | 11 |
ISSN | 2470-0010 |
DOIs | |
Publication status | Published - 19 May 2021 |
Externally published | Yes |
- OPTICAL APPEARANCE, STAR, PERTURBATIONS, OBJECTS, SHADOW, FIELD
Research areas
Links
- https://arxiv.org/pdf/2102.07784.pdf
Submitted manuscript
ID: 298632975