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Can gravitational lensing from intervening galaxies cause the observed ripples in the Cosmic Microwave Backgro

In Astronomy & Space
   

    


Lensing can have a significant effect on very small ripples in the CBR, but a negligible effect on the larger ones. It can certainly change the shape of any preexisting ripples in the CBR, but astronomers are less interested in measuring the exact shape of the ripples than they are in measuring the amount of temperature variation contained in ripples of different sizes, summed up over the entire sky. It turns out that gravitational lensing doesn't affect this measurement too much.

Also, gravitational lensing isn't going to create ripples where there were none before - all it will do is change the shape of preexisting ones. Think about it this way: If you look through a magnifying glass or lens at a blank wall, the wall will still be blank - you aren't going to be able to arrange lenses in such a way that the wall will appear to have spots!
366 days ago
  
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