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Dumb question but does the lensing distort what we would see if there was no lensing at all? Or does that information get compressed as part of the lensing and
by Yhippa 8y ago
Dumb question but does the lensing distort what we would see if there was no lensing at all? Or does that information get compressed as part of the lensing and we need to "stretch" it out to see it?
- roywiggins 8y agoThis is what an Einstein ring looks like, caused by lensing: https://3c1703fe8d.site.internapcdn.net/newman/gfx/news/hires/2018/1-imagehubblef.jpg https://3c1703fe8d.site.internapcdn.net/newman/gfx/news/hire... Anyway, the test of GR in the actual article does not appear to use or reference lensing at all. It's about looking at the orbit of a star in an extreme gravitational environment and comparing it to what Newtonian models would predict.
- tEMporality7 8y agoWouldn't Newtonian models be off in their predictions for those extreme cases?
- tomrod 8y agoI assume that's the point?
- antientropic 8y agoIndeed that's the point: > The team compared the position and velocity measurements from GRAVITY and SINFONI respectively, along with previous observations of S2 using other instruments, with the predictions of Newtonian gravity, general relativity and other theories of gravity. The new results are inconsistent with Newtonian predictions and in excellent agreement with the predictions of general relativity.
- philipov 8y agoThe conservation of information means that the phase space of a system is incompressable. I believe this is equivalent to saying we can just stretch the image out, within the limits of our ability to resolve detail.