Comment on Aberration in gravitational lensing
Phys. Rev. D submitted (05 Feb 2010, 25 Mar 2010)
Olaf Wucknitz [1]
- Argelander-Institut für Astronomie, Auf dem Hügel 71, 53121 Bonn, Germany
Abstract
In the article Aberration in gravitational lensing by Sereno,
relativistic aberration is used to describe the gravitomagnetic effects of
moving gravitational lenses. It is found that Einstein radii of
radially moving point-mass lenses scale with 1-v/c$, which would
contradict direct conclusions from previous authors" work. This comment
argues that these results are actually in agreement if it is taken into
account that the geometry is defined differently. The mentioned scaling is
merely a result of relativistic aberration itself but not specific for
lensed sources. In addition we elaborate on the concept of using modified
angular size distances to quantify the effects of radial motion of source,
lens or observer. This leads to a significantly simplified description of
these effects.
In contrast to Sereno, we find that transverse motion does not
distort Einstein rings into ellipses but only changes their size.
Key words:
PACS 95.30.Sf, 04.20.Cv, 04.25.Nx, 98.62.Sb
This is the continuation of a subject I wrote a first paper on some years ago. It is a comment
on a paper by
Mauro Sereno. A revision has been submitted as reaction to a reply from Sereno.
Phys. Rev. D submitted (05 Feb 2010, 25 Mar 2010) (link to online journal)
download preprint
PDF file (149.2 kB, last change 5 Feb 2010)
Original version. 4 pages, one figure, all b/w.
download preprint2
PDF file (108.7 kB, last change 25 Mar 2010)
Revised version, some clarifications to avoid
misunderstandings. No changes to conclusions. 5 pages, one figure, all b/w.
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Script last modified on 7 Sep 2010
Last change to this data base entry on 25 Mar 2010