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Zoom media briefing:The Event Horizon Telescope, a year after capturing the image of a black hole（图）
Zoom media briefing Event Horizon Telescope year after capturing the image black hole
2020/4/10
Media are invited to join an April 10 Zoom media briefing with Sheperd S. Doeleman, founding director of the Event Horizon Telescope (EHT), and astrophysicist Michael Johnson to discuss the one-year a...
This week heralds an exciting and challenging endeavor for astronomy. The Event Horizon Telescope will seek to capture a first-ever image of the supermassive black hole at the center of the Milky Way,...
Event Horizon Telescope Reveals Magnetic Fields at Milky Way's Central Black Hole
Telescope Magnetic Fields Milky Way Central Black Hole
2015/12/14
Most people think of black holes as giant vacuum cleaners sucking in everything that gets too close. But the supermassive black holes at the centers of galaxies are more like cosmic engines, convertin...
Can an astrophysical black hole have a topologically non-trivial event horizon?
astrophysical black hole topologically non-trivial horizon
2011/10/17
In 4-dimensional General Relativity, there are several theorems restricting the topology of the event horizon of a black hole. In the stationary case, black holes must have a spherical horizon, while ...
Future deceleration due to effect of event horizon on cosmic backreaction
Future deceleration cosmic backreaction
2011/1/10
The present acceleration of the universe leads to the formation of a cosmological future event horizon. We explore the effects of the event horizon on cosmological backreaction due to inhomogeneities ...
1.3 mm Wavelength VLBI of Sagittarius A*: Detection of Time-Variable Emission on Event Horizon Scales
Galaxy center — submillimeter general — techniques high angular resolution — techniques
2010/11/15
Sagittarius A*, the 4 × 106 M⊙ black hole candidate at the Galactic Center, can be studied on Schwarzschild radius scales with (sub)millimeter wavelength Very Long Baseline Interferometry (VLBI). We...
Gravitational-wave signatures of the absence of an event horizon. II. Extreme mass ratio inspirals in the spacetime of a thin-shell gravastar
Gravitational-wave signatures event horizon thin-shell gravastar
2010/3/18
We study gravitational-wave emission from the quasi-circular, extreme mass ratio inspiral of compact objects of mass m0 into massive objects of mass M>>m0 whose external metric is identical to the Sch...
On the existence of cosmological event horizon
Cosmological horizon strong energy condition positive cosmological constant
2010/3/17
We show that, for general static or axisymmetric stationary spacetimes, a cosmological horizon exists only if $R_{ab}n^{a}n^{b}< 0$ for a hypersurface orthogonal timelike $n^{a}$, at least over some p...