%0 Journal Article
%T Comment on ˇ°Effective Refractive Index Tensor for Weak-Field Gravityˇ± by P. Boonserm, C. Cattoen, T. Faber, M. Visser and S. Weinfurtner
%A R O Vlokh
%A M E Kostyrko
%J Ukrainian Journal of Physical Optics
%D 2006
%I Institute of Physical Optics
%X P. Boonserm et. al have tried to describe some anisotropic optical effects in the gravitation field in frame of the general relativity and by introducing the so-called ˇ°effective refractive index tensorˇ± similarly to anisotropic crystals. We suppose that this approach is inconsequent because of the following: if one develops this claim, it would be necessary to attribute the gravitation field to the properties of matter, including its electric properties, the refractive index is not a tensorial quantity and the analogy to the situation in anisotropic crystals does not lead to artificial ˇ°effective refractive index tensorˇ± but to naturally introduced tensor of optical-frequency dielectric impermeability of matter.
%K weak-field gravity
%K refractive index
%U http://www.ifo.lviv.ua/journal/UJPO_PDF/2006_3/0903_2006.pdf