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A basic question about gravitational Lensing
Can it ever occur in Gravitational Lensing that a mass
distribution which lenses the object acts like a Concave lens and teh rays of light after passing around the object diverge ? Can such a situation ever occur in GR (or any other theory of gravity?) Thanks Melroy |
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A basic question about gravitational Lensing
Melroy wrote:
Can it ever occur in Gravitational Lensing that a mass distribution which lenses the object acts like a Concave lens and teh rays of light after passing around the object diverge ? Can such a situation ever occur in GR (or any other theory of gravity?) Thanks Melroy This is actually the "normal" action of gravitational deflection in a clumpy Universe (as required by energy conservation). In all the directions in which the amplification by a particular lens mass is less than 1, there is a divergence in excess of what the inverse-square law alone predicts. In a sense, that's where the "extra" energy seen in the amplified zone comes from. This may not exactly answer the question, since the divergence comes not from objects but from their absence - one has the such an effect when the line of sight passes through a lower-than-surrounding mass density. Bill Keel |
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A basic question about gravitational Lensing
Melroy wrote:
Can it ever occur in Gravitational Lensing that a mass distribution which lenses the object acts like a Concave lens and teh rays of light after passing around the object diverge ? Can such a situation ever occur in GR (or any other theory of gravity?) Thanks Melroy This is actually the "normal" action of gravitational deflection in a clumpy Universe (as required by energy conservation). In all the directions in which the amplification by a particular lens mass is less than 1, there is a divergence in excess of what the inverse-square law alone predicts. In a sense, that's where the "extra" energy seen in the amplified zone comes from. This may not exactly answer the question, since the divergence comes not from objects but from their absence - one has the such an effect when the line of sight passes through a lower-than-surrounding mass density. Bill Keel |
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A basic question about gravitational Lensing
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A basic question about gravitational Lensing
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