MG12 - Talk detail
 

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Abstract

REES-SCIAMA EFFECT IN ACCELERATING UNIVERSE

The influence of the observed relict vacuum energy on the fluctuations of CMBR going through cosmological matter condensations is studied in the framework of the Einstein-Strauss-de Sitter vakuola model. It is shown that refraction of light at the matching surface of the vakuola and the expanding Friedman universe can be very important during accelerated expansion of the universe, when the velocity of the matching surface relative to static Schwarzchild observers becomes relativistic. Relevance of the refraction effect for the temperature fluctuations of CMBR is given in terms of the redshift and the angular extension of the fluctuating region. The bending of light in Schwarzchild-de Sitter region is included in studying its effect on resulting temperature fluctuation of CMBR. We also give the influence of different vakuola distances on CMBR temperature fluctuations.

OPTICAL PHENOMENA IN BRANEWORLD KERR SPACETIMES

In the framework of the braneworld models, rotating black holes can be described by the Kerr metric with a tidal charge representing the influence of the non-local gravitational (tidal) effects of the bulk space Weyl tensor onto the black hole spacetime. We study the influence of the tidal charge onto the silhouette shape of the black hole on bright background, profiled spectral lines generated by radiating disk orbiting in vicinity of a rotating black hole and light curves of radiating source on Keplerian circular orbits around the black hole.

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