Strong Gravity News & Events

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The Black Hole Photon Ring

Speaker
Alex Lupsasca (Princeton University)
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online (only)
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The photon ring is a narrow ring-shaped feature, predicted by General Relativity but not yet observed, that appears on images of sources near a black hole. It is caused by extreme bending of light within a few Schwarzschild radii of the event horizon and provides a direct probe of the unstable bound photon orbits of the Kerr geometry.

Just the tip of the iceberg

Bosonic stars are multipurpose gravitational solitions and dark matter contenders. Yet, as shown in a paper co-authored by Gr@v members. N. Sanchis-Gual, C. Herdeiro and E. Radu published in Physical Review Letters, the known solutions are just the just the tip of the iceberg... and the new configurations unveil a mechanism that provides dynamical stability. 

Discussion of the paper "Wormholes in spacetime and their use for interstellar travel: A tool for teaching general relativity" by M. S. Morris and K. S. Thorne

Speaker
Haroldo C. D. Lima Junior (UFPA, Belém)
Event date
Venue
online (only)
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Wormholes in spacetime and their use for interstellar travel: A tool for teaching general relativity
M. S. Morris and K. S. Thorne
Am. J. Phys. 56 (1988) 395-412