21 research outputs found
Theoretical and experimental studies of electronic band structure for GaSb1-xBix in the dilute Bi regime
A Uni-Axial Nano-Displacement Micro-Tensile Test of Individual Constituents from Bulk Material
Herpes zoster-associated idiopathic thrombocytopenic purpura in a liver transplant recipient: a case report and overview
Surface Decoration for Improving the Accuracy of Displacement Measurements by Digital Image Correlation in SEM
Mutations in the gene encoding B1 subunit of H+-ATPase cause renal tubular acidosis with sensorineural deafness
Mutations in the gene encoding B1 subunit of H+-ATPase cause renal tubular acidosis with sensorineural deafness
Mutations in the gene encoding B1 subunit of H+-ATPase cause renal tubular acidosis with sensorineural deafness
A massive binary black-hole system in OJ287 and a test of general relativity
Tests of Einstein's general theory of relativity have mostly been carried out
in weak gravitational fields where the space-time curvature effects are
first-order deviations from Newton's theory. Binary pulsars provide a means of
probing the strong gravitational field around a neutron star, but strong-field
effects may be best tested in systems containing black holes. Here we report
such a test in a close binary system of two candidate black holes in the quasar
OJ287. This quasar shows quasi-periodic optical outbursts at 12 yr intervals,
with two outburst peaks per interval. The latest outburst occurred in September
2007, within a day of the time predicted by the binary black-hole model and
general relativity. The observations confirm the binary nature of the system
and also provide evidence for the loss of orbital energy in agreement (within
10 per cent) with the emission of gravitational waves from the system. In the
absence of gravitational wave emission the outburst would have happened twenty
days later.Comment: 14 pages, 3 figures, published in Natur