[Lex Computer & Tech Group/LCTG] Speed of gravity

[Larry Wittig]

Looks like one part in ~2E15, and who knows when in the merger event the
light was emitted.  G-wave events have a duration of about 0.5 seconds, and
how do you peg the starting point.

[image: image.png]

On Thu, Oct 27, 2022 at 5:16 PM Carl Lazarus <carllazarus at comcast.net>
wrote:

> 2 seconds out of 130 million years is not much of a discrepancy.  Assuming
> it’s not an issue with our measurements, one starting 2 seconds before the
> other seems like a possible explanation.
>
> On Thu, Oct 27, 2022 at 2:43 PM Steve Isenberg <smisenberg at gmail.com>
> wrote:
>
>> According to the speed of gravity article, they measured the speed of
>> gravitational waves compared to the speed of light, by recording the
>> relative time that the two waves reached Earth from an event that occurred
>> 130 million years ago when two neutron stars collided and thus emitted both
>> gravitational waves and light waves.
>> The gravitational waves and light waves arrived within 2 seconds of each
>> other.
>>
>> The article concludes that the two speeds (gravity, light) are exactly
>> the same (which on one hand makes sense).
>>
>> However, how do they account for the 2 seconds difference in the arrival
>> time of the two waves?
>>
>> I suspect that it's due to gravitational influence of objects between us
>> and the two neutron stars, or maybe the distance between locations of the
>> two instruments on or near Earth (but I would have expected them to account
>> for this).  Or maybe the light was emitted by the neutron star collision
>> just a little before or after the gravitational waves.
>>
>> Anyone here have any thoughts on this?
>> -steve
>>
>> On Thu, Oct 27, 2022 at 2:23 PM john rudy <jjrudy1 at comcast.net> wrote:
>>
>>> Pretty interesting
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