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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20130122T123000
DTEND;TZID=Atlantic/Canary:20130122T133000
UID:iactalks-463
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/463
CREATED:2013-01-22T12:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Voids Merging Trees 
DESCRIPTION:Voids Merging Trees \nMrs. Esra Russell\n\nObservational studie
 s show that voids are prominent features of the  large scale structure of 
 the present day Universe. Even though their  emerging from the primordial 
 density perturbations and evolutionary  patterns differ from dark matter h
 alos, N-body simulations and  theoretical models have shown that voids als
 o merge together to form  large void structures. In this study, progressin
 g from previous works, we formulate a toy model  to construct a merger tre
 e algorithm of isolated spherical voids by  adopting the halo merging algo
 rithm given by Lacey and Cole (1993) in  the Einstein de Sitter (EdS) univ
 erse. To do this, we take into account  the general mass distribution of v
 oids which consists of two main void  sociologies: merging and collapsing.
  We show that the mass distribution  function can be reduced to a simple f
 orm by neglecting the collapse void  contribution. As a result of this, th
 e void mass fraction has a  contribution only from isolated gradually merg
 ing voids. This algorithm  becomes the analogue of the halo merging algori
 thm. Based on this  isolated spherical void distribution, we obtain the vo
 id merging  algorithm, void merging rate and void survival times in terms 
 of the  self similar and standard cold dark matter models in the EdS unive
 rse.
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