The Signatures of Voids and the CMBR

Details The Signatures of Voids and the CMBR The Signatures of Voids and the CMBR

1995-02-11

arxiv.org/abs/astro-ph/9502060v1

Astronomy and Astrophysics

Astrophysics

4 pages; uunencoded compressed postscript file. To appear in the Proceedings of the $17^{th}$ Texas Symposium for Relativistic

Scientific paper

10.1111/j.1749-6632.1995.tb17641

We explore the signature of a cold dark matter compensated void in the quasi non-linear regime. We find that this void is entirely a cold spot on the microwave background, in contrast to a non-linear void. On the last scattering surface(LSS), it appears as either a hot or cold spot depending on where this surface cuts the void. In addition, because the usual cancellations do not occur, the void's LSS signature can be very large as it is proportional to $R/H^{-1}$ rather than $(R/H^{-1})^3$. This implies strict limits for voids on the LSS.

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