the god said:
Lets transport a big Cube (with sharp straight edges) on the surface of the Neutron Star, assuming that Neutron Star has extreme Gravity and appreciable curvature is present, now can you please analyse how an observer will see the cube from a distance?
Professor Eric V. Linder said:
Hi Tashja,
The key to thinking about gravitational lensing is the lensing part. The effects really are not that different from looking through normal lenses. You can find many example of videos comparing gravitational lensing images to those seen through lenses like the base of a wine glass on the web. Also see a video glossary by one of my colleagues, Reiko Nakajima, at http://videoglossary.lbl.gov/#n36
Gravity bends light just like a lens does. Why? Because (in almost all situations) gravity acts like an index of refraction. When you look at a fish at the bottom of a pond, you do not see it at its true position because water bends light - it has an index of refraction of 1.33. A straight stick extending from the air into the water will appear bent. The index of refraction of gravity is given by 1+Phi, where Phi is the gravitational potential GM/(r c^2), where M is the mass of a gravitational mass and r is the distance from it. Near the surface of the Sun, the strength of Phi is 0.000001 (10^{-6}), so the index of refraction is quite small and one needs precise experiments to measure the bending of light (i.e. gravitational lensing). For a neutron star, r is much smaller than the Sun, although the mass M is about the same: Phi is about 0.1. So a cube sitting on a neutron star would appear about the same as a cube sitting at the bottom of a pool, with regard to lensing effects!
Only when you get to black holes, where Phi is near 1, do new aspects of gravitational lensing enter. This is because interpreting gravity as an index of refraction is only good when Phi is much less than 1, what is called the linear gravitation theory.
Thanks for your interest in gravity.
Best,
Eric
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http://www.mathpages.com/rr/s8-04/8-04.htm
http://www.eftaylor.com/download.html#general_relativity
The path of the light from the emitter to the observer, is dictated by curved spacetime or geodesics.
The eye interprets that curved geodesic path as a straight line and gives an apparent position different from the true position.
The problem you envisage is non existent.
Tell me again.I told you many a times, to stay away, if you do not have anything to contribute...You are just cluttering the thread.
Prof Linder said:...Only when you get to black holes, where Phi is near 1, do new aspects of gravitational lensing enter. This is because interpreting gravity as an index of refraction is only good when Phi is much less than 1, what is called the linear gravitation theory....
You can tell me nothing: You are an amatuer lay person with an apparent anti cosmology streak and threads shifted to the fringes.Again the same image, which proves Newtonian Flat space....I can tell you GL as envisaged cannot happen in curved spacetime.
Science does not deal in proofs...Again the same image, which proves Newtonian Flat space....I can tell you GL as envisaged cannot happen in curved spacetime.
Science does not deal in proofs...
The image illustrates how and why gravitational lensing occurs...nothing more, nothing less.
[1]Light follows geodesics in curved spacetime.
[2]Spacetime tells matter how to move; matter tells spacetime how to curve.
John Wheeler:
]3]Curved spacetime is an effect that has been validated and a requirement of GR.
[4]
The path of the light from the emitter to the observer, is dictated by curved spacetime or geodesics.
The eye interprets that curved geodesic path as a straight line and gives an apparent position different from the true position.
Parrotized but correct.parrotized stuff devoid of any argument !!
Parrotized but correct.
Wow!!! I mean are you really fair dinkum?Right, very true, it proves how gravitational lensing occurs..
But, look at the image again..
It proves how lensing takes place in Newtonian Flat space...
GL proves flat space not curved space !!
Wow!!! I mean are you really fair dinkum?
Gravitational lensing is observed because of curved spacetime, and you are still infatuated with "prove and proof" the way of most of our god botherers.
ps: You do now appear to be reaching desperate stages...Perhaps take a step back and see the error of your nonsensical posts and your methodology?
That's OK, desperation tactics is to reverse what actually applies to yourself and as this forum recognises.I feel pity on you, Paddoboy.
You posted an image which shows Newtonian Implications, now you are dancing around saying that it proves curved spacetime. Have some shame, argue like a man, not like some street urchin !!
The image supports and illustrates gravitational lensing....
It's a 2 D illustration! Have you still not noticed it?Agreed !
But it shows Newtonian Flat space, not curved spacetime of GR !! Have you still not noticed it ?
Obviously!river, Ultron and The God will be crushed.
It's a 2 D illustration! Have you still not noticed it?
but here's some more.....
View attachment 1104
http://hubblesite.org/gallery/album/exotic/gravitational_lens/
Only an utter fool would really deny the multitude of images that have been posted, imaging actual gravitational lensing, spacetime curvature and GR confirmation, both here and elsewhere when you have chosen to conduct your evengelisitc like mission against mainstream cosmology.
As was mentioned earlier on in this post before your desperation episodes,
Obviously!