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First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
When surrounded by a transparent emission region, black holes are expected to reveal a dark shadow caused by gravitational light bending and photon capture at the event horizon. To image and studyExpand
A wide star–black-hole binary system from radial-velocity measurements
Radial-velocity measurements of a Galactic B-type star show a dark companion that seems to be a black hole of about 68 solar masses, in a widely spaced binary system. Expand
New tests of local Lorentz invariance of gravity with small-eccentricity binary pulsars
Some alternative gravity theories allow the Universal matter distribution to single out the existence of a preferred frame, which breaks the symmetry of local Lorentz invariance (LLI) for theExpand
Improved effective-one-body model of spinning, nonprecessing binary black holes for the era of gravitational-wave astrophysics with advanced detectors
We improve the accuracy of the effective-one-body (EOB) waveforms that were employed during the first observing run of Advanced LIGO for binaries of spinning, nonprecessing black holes by calibratingExpand
Lorentz violation from cosmological objects with very high energy photon emissions
Abstract Lorentz violation (LV) is predicted by some quantum gravity theories, where photon dispersion relation is modified, and the speed of light becomes energy-dependent. Consequently, it resultsExpand
New limits on the violation of local position invariance of gravity
Within the parameterized post-Newtonian (PPN) formalism, there could be an anisotropy of local gravity induced by an external matter distribution, even for a fully conservative metric theory ofExpand
Combined search for anisotropic birefringence in the gravitational-wave transient catalog GWTC-1
The discovery of gravitational waves (GWs) provides an unprecedented arena to test general relativity, including the gravitational Lorentz invariance violation (gLIV). In the propagation of GWs, aExpand
First M87 Event Horizon Telescope Results. II. Array and Instrumentation
The Event Horizon Telescope (EHT) is a very long baseline interferometry (VLBI) array that comprises millimeter- and submillimeter-wavelength telescopes separated by distances comparable to theExpand
Gravitational Test beyond the First Post-Newtonian Order with the Shadow of the M87 Black Hole.
It is shown analytically that spacetimes that deviate from the Kerr metric but satisfy weak-field tests can lead to large deviations in the predicted black-hole shadows that are inconsistent with even the current EHT measurements. Expand
Tests of local Lorentz invariance violation of gravity in the standard model extension with pulsars.
  • L. Shao
  • Physics, Medicine
  • Physical review letters
  • 26 February 2014
Einstein's equivalence principle is verified substantially further by pulsar experiments in terms of local Lorentz invariance in gravity in the pure-gravity sector of minimal standard model extension with the state-of-the-art pulsar observations. Expand