Fluctuations of CMBR in accelerating universe
Z. Stuchl\'ik, J. Schee
TL;DR
This paper investigates how vacuum energy influences CMBR fluctuations during the universe's accelerated expansion, emphasizing the importance of light refraction effects at cosmic boundaries on observed temperature fluctuations.
Contribution
It introduces a model analyzing the impact of vacuum energy and refraction at the vakuola boundary on CMBR fluctuations in an accelerating universe.
Findings
Refraction effects become significant during accelerated expansion.
Relativistic velocities at the boundary affect CMBR temperature fluctuations.
Relevance depends on redshift and angular size of fluctuations.
Abstract
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 Schwarzchildian 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.
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