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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20150630T123000
DTEND;TZID=Atlantic/Canary:20150630T133000
UID:iactalks-796
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/796
CREATED:2015-06-30T12:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Tests for the Expansion of the Universe 
DESCRIPTION:Tests for the Expansion of the Universe \nDr. Martin Lopez Corr
 edoira\n\nAlmost all cosmologists accept nowadays that the  redshift of th
 e galaxies is due to the expansion of the Universe  (cosmological redshift
 ), plus some Doppler effect of peculiar motions,  but can we be sure of th
 is fact by means of some other independent  cosmological test? Here I will
  review some recent tests: CMBR  temperature versus redshift, time dilatio
 n, the Hubble diagram, the  Tolman or surface brightness test, the angular
  size test, the UV surface  brightness limit and the Alcock-Paczynski test
 . Some tests favour  expansion and others favour a static Universe. Almost
  all the  cosmological tests are susceptible to the evolution of galaxies 
 and/or  other effects. Tolman or angular size tests need to assume very st
 rong  evolution of galaxy sizes to fit the data with the standard cosmolog
 y,  whereas the Alcock-Paczynski test, an evaluation of the ratio of  obse
 rved angular size to radial/redshift size, is independent of it.
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