LIGO detections that happened yesterday

[John Clark]

Yesterday on August 28 2019 LIGO detected 2 Gravitational wave events just 21 minutes apart, the first at 6:34:05 UTC and the second at 6:55:09 UTC, the events were at the same distance, 6.4 billion light years, and they were in the same general part of the sky. The events were seen in all 3 detectors in Louisiana, Washington State and Italy. LIGO now releases the raw data of what they've found almost instantly so optical astronomers can look for something, so no detailed computer analysis has been done yet, but the early speculation is this is the first gravitationally lensed gravitational wave detection.

John K Clark

[Lawrence Crowell]

On Thursday, August 29, 2019 at 5:53:04 AM UTC-5, John Clark wrote:

Yesterday on August 28 2019 LIGO detected 2 Gravitational wave events just 21 minutes apart, the first at 6:34:05 UTC and the second at 6:55:09 UTC, the events were at the same distance, 6.4 billion light years, and they were in the same general part of the sky. The events were seen in all 3 detectors in Louisiana, Washington State and Italy. LIGO now releases the raw data of what they've found almost instantly so optical astronomers can look for something, so no detailed computer analysis has been done yet, but the early speculation is this is the first gravitationally lensed gravitational wave detection.

John K Clark

There appears to prior detections of this.

 https://www.scientificamerican.com/article/has-ligo-seen-galaxy-warped-gravitational-waves/

A preprint on this physics is also at

https://arxiv.org/abs/1702.04724

Weak gravitational waves are similar to a bipartite entanglement of two photons. The only difference is a very weak coupling to mass instead of a much stronger coupling to electric charge. So gravitational radiation should be Einstein lensed, and in fact if the geodetic mapping of gravitational waves can be improved it is possible that forms of Einstein rings should be apparent.

LC

[John Clark]

Puzzling signals seen by LIGO may be gravitational wave split in two

John K Clark

[Lawrence Crowell]

On Friday, August 30, 2019 at 6:32:45 AM UTC-5, John Clark wrote:

Puzzling signals seen by LIGO may be gravitational wave split in two

John K Clark

This weak lensing is not surprising, but it could test some aspects of gravitation . What would be curious is if there is a strong lensing. A gravitation wave front with some Weyl curvature has a part of it wind around the intervening mass. This would result in multiple signals and a further delayed signal. The Weyl curvature is conformal, which is really a form of the Huygens' principle. This splitting of light and now gravitational waves by intervening gravitating masses is a sort of beam splitter. In effect these detections are to gravitational waves what classical optics is to light. 

LC